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Cheap flights from Sydney to Illinois from $929

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/1. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
4 Jan — 11 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Sydney to Illinois

Enter your travel dates to find the best prices.

Cheapest flights from Sydney to Illinois
Explore the most affordable flight options available from Sydney to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 December 2025.

Sun 7/1217:45SYD - STL
1 stop23h 12mQantas Airways
Sun 14/1213:20STL - SYD
1 stop24h 35mQantas Airways
Deal found 2/12$1,565
Sun 7/1211:20SYD - STL
2 stops25h 07mAmerican Airlines
Sun 14/1213:20STL - SYD
2 stops26h 40mAmerican Airlines
Deal found 2/12$1,567
Wed 17/1212:10SYD - ORD
2 stops25h 58mUnited Airlines
Thu 22/116:16ORD - SYD
1 stop23h 59mUnited Airlines
Deal found 4/12$1,786
Mon 15/1212:10SYD - ORD
2 stops24h 34mUnited Airlines
Fri 9/118:29ORD - SYD
1 stop42h 51mUnited Airlines
Deal found 4/12$1,800
Thu 25/1211:20SYD - ORD
1 stop20h 21mAir Canada
Fri 23/115:35ORD - SYD
1 stop25h 00mAir Canada
Deal found 3/12$2,063
Thu 25/1211:20SYD - ORD
1 stop20h 12mUnited Airlines
Fri 23/116:16ORD - SYD
1 stop21h 04mUnited Airlines
Deal found 4/12$2,176
Wed 24/1211:20SYD - ORD
2 stops24h 25mUnited Airlines
Thu 8/114:40ORD - SYD
1 stop22h 40mUnited Airlines
Deal found 4/12$2,193
Wed 17/1211:20SYD - ORD
1 stop23h 32mQantas Airways
Thu 22/111:56ORD - SYD
1 stop25h 59mQantas Airways
Deal found 3/12$2,483
Wed 3/1210:40SYD - MDW
2 stops22h 54mDelta
Wed 31/1209:50MDW - SYD
2 stops29h 40mDelta
Deal found 2/12$2,500
Wed 17/1211:20SYD - ORD
1 stop20h 21mAir Canada
Thu 22/115:35ORD - SYD
2 stops30h 05mAir Canada
Deal found 3/12$2,575
Sun 14/1212:10SYD - ORD
1 stop19h 38mUnited Airlines
Fri 2/107:10ORD - SYD
1 stop32h 55mUnited Airlines
Deal found 4/12$2,586
Thu 18/1216:00SYD - ORD
1 stop39h 41mAir Canada
Thu 22/115:35ORD - SYD
1 stop25h 00mAir Canada
Deal found 3/12$2,683

Find flight deals from Sydney to Illinois

Keep the following information in mind while searching for Sydney to Illinois flight deals. Data was last updated 5 December 2025.

Round-trip from

$1,453

One-way from

$929

Popular in

December

Cheapest in

March

Average price

$2,249
Air Canada
  • Air Canada
  • 26/4-29/4
  • 4 total stops
  • 75h 43m total
  • Sydney to Illinois
Search Deals
17/1
  • 17/1
  • 2 total stops
  • 26h 54m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($682 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($101 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Sydney to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 5 December 2025.
Use the filters below to find and compare flights from Sydney to Illinois that are best for you.

Fly from

Sydney

Fly to

Illinois

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 1/5

09:20-15:16

2 stops44h 56m

Lambert-St Louis

Fri 29/5

13:30-07:20

2 stops50h 50m

$1,478

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 1/5

09:10-23:16

1 stop29h 06m

Lambert-St Louis

Fri 29/5

19:47-06:55

1 stop20h 08m

$1,639

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 1/5

12:00-18:17

1 stop21h 17m

Lambert-St Louis

Fri 29/5

19:47-06:55

1 stop20h 08m

$1,642

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 4/3

11:20-08:00

2 stops37h 40m

Chicago O'Hare Intl

Sun 8/3

21:21-08:35

2 stops43h 14m

$1,656

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 16/5

11:55-21:11

2 stops24h 16m

Chicago O'Hare Intl

Sat 6/6

16:40-08:45

2 stops25h 05m

$1,753

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 2/6

11:50-20:22

2 stops47h 32m

Chicago O'Hare Intl

Tue 4/8

17:45-09:25

1 stop24h 40m

$1,783

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 17/12

11:50-19:46

1 stop24h 56m

Chicago O'Hare Intl

Thu 22/1

17:16-09:15

1 stop22h 59m

$1,786

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 14/2

11:20-15:29

2 stops45h 09m

Lambert-St Louis

Wed 18/2

14:45-09:35

2 stops25h 50m

$1,791

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 15/12

11:20-18:50

1 stop24h 30m

Chicago O'Hare Intl

Fri 9/1

18:29-06:20

1 stop42h 51m

$1,800

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 16/1

14:00-20:58

2 stops23h 58m

Lambert-St Louis

Fri 23/1

06:45-09:15

1 stop33h 30m

$1,942

Flights are sorted by cheapest return flights first.

Deals found on 4/12

Showing 1-10 of 48 results
1
2
3
...
5

Best time to book a flight from Sydney to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Sydney with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Sydney to Illinois

What is the cheapest month to book a flight from Sydney to Illinois?

Currently, September is the cheapest month in which you can book a flight from Sydney to Illinois (average of $938). Flying from Sydney to Illinois in December is currently the most expensive (average of $1,588). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SYD to IL?

Find hourly flight availability from Sydney to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 5 December 2025.

One of the essential ways to save on airfare from Sydney to Illinois is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 29% on airfare.

What is the cheapest day to fly from Sydney to Illinois?

Use this chart to determine the cheapest time to fly return from Sydney to Illinois. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their Sydney to Illinois flight should consider departing on Monday at midday when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost for a return flight from Sydney to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 5 December 2025.
Read through reviews of airlines operating flights from Sydney to Illinois, such as Air New Zealand, Qantas Airways, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.2

Food

7.4

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Annabel,Dec 2025

WRE - AKL

Both my flights from Whangarei to Auckland and Auckland to Vancouver where late by an hour... That created a lot of anxiety that I would make it between flights, and had my husband waiting many hours for me in Vancouver to pick me up. Can there not be another plane on standby for when delays happen. The weather was not stormy, whatever the reason for the delay it happens a lot! Talking to local kiwis. No one is happy about it. The planes are also quite cold. I realise there is a belief that the cold helps one sleep, but that's a myth. It really doesn't. There is a certain warm temperature maybe a touch below body heat that is cosy to sleep. I dressed extra warm, with a t-shit, sweater and feather winter coat, still using the blanket for my legs, to stay warm on the flight back to Vancouver. It was uncomfortable in economy class. Not much room to stretch between two people. Everything else was lovely, the attendants, the food. I wish that there were more signs at the Auckland airport, knowing where to go would have been nice too. When I first landed in Auckland and had to go to domestic, it was my first time after 30 years. I asked someone where do I go? they said follow the line. They didn't say there was a bus, there were no signs saying free bus to and from domestic. It was pouring with rain, my plane again had arrived late from Brisbane, that time, air NZ all the way and I followed the line, hoping it was around the next corner, and the next corner, and the next... arriving soaked! With a few mins to spare to my auckland to whangarei flight. High anxiety that day too. When I went from Vancouver-Auckland-Brisbane. I again was confused with the signs to go international. And walking through the shops, would never have guest that was the way to go. I realise Auckland airport is getting construction done, maybe that will solve the way people go with better signs then. but for now its very confusing. Plus I saw someone purchase maple syrup at customs before their flight, and it was confiscated when they had their carry on bag checked. That doesn't seem right, made not want to purchase anything at customs. If its going to be confiscated. my recharger battery to use on the go to power charge my ipad and phone was confiscated that was over $100, would like my money back. It went from vancouver to brisbane to auckland and whangarei, then whangarei to auckland. but auckland to vancouver my luggage had the lock broken and a note saying they took it. kinda feel violated. Could customs not have called me over and asked me about it, and i could have carried it on in my carryon bag, because it seemed ok when i had it on my carry on, just not my suitcase. I ipad and phone have lithium batteries, didn't seem right. It was for charging when i was up north of newzealand on the beach. taking lots of photos needed it to recharge divices when there was no electricity driving in the car. anyway that was annoying. live and learn.
Air New Zealand
8.0
Very Good
544 reviews
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.2

Food

7.4

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Annabel,Dec 2025

WRE - AKL

Both my flights from Whangarei to Auckland and Auckland to Vancouver where late by an hour... That created a lot of anxiety that I would make it between flights, and had my husband waiting many hours for me in Vancouver to pick me up. Can there not be another plane on standby for when delays happen. The weather was not stormy, whatever the reason for the delay it happens a lot! Talking to local kiwis. No one is happy about it. The planes are also quite cold. I realise there is a belief that the cold helps one sleep, but that's a myth. It really doesn't. There is a certain warm temperature maybe a touch below body heat that is cosy to sleep. I dressed extra warm, with a t-shit, sweater and feather winter coat, still using the blanket for my legs, to stay warm on the flight back to Vancouver. It was uncomfortable in economy class. Not much room to stretch between two people. Everything else was lovely, the attendants, the food. I wish that there were more signs at the Auckland airport, knowing where to go would have been nice too. When I first landed in Auckland and had to go to domestic, it was my first time after 30 years. I asked someone where do I go? they said follow the line. They didn't say there was a bus, there were no signs saying free bus to and from domestic. It was pouring with rain, my plane again had arrived late from Brisbane, that time, air NZ all the way and I followed the line, hoping it was around the next corner, and the next corner, and the next... arriving soaked! With a few mins to spare to my auckland to whangarei flight. High anxiety that day too. When I went from Vancouver-Auckland-Brisbane. I again was confused with the signs to go international. And walking through the shops, would never have guest that was the way to go. I realise Auckland airport is getting construction done, maybe that will solve the way people go with better signs then. but for now its very confusing. Plus I saw someone purchase maple syrup at customs before their flight, and it was confiscated when they had their carry on bag checked. That doesn't seem right, made not want to purchase anything at customs. If its going to be confiscated. my recharger battery to use on the go to power charge my ipad and phone was confiscated that was over $100, would like my money back. It went from vancouver to brisbane to auckland and whangarei, then whangarei to auckland. but auckland to vancouver my luggage had the lock broken and a note saying they took it. kinda feel violated. Could customs not have called me over and asked me about it, and i could have carried it on in my carryon bag, because it seemed ok when i had it on my carry on, just not my suitcase. I ipad and phone have lithium batteries, didn't seem right. It was for charging when i was up north of newzealand on the beach. taking lots of photos needed it to recharge divices when there was no electricity driving in the car. anyway that was annoying. live and learn.
Qantas Airways
7.5
Good
947 reviews
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.2

Food

7.4

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Annabel,Dec 2025

WRE - AKL

Both my flights from Whangarei to Auckland and Auckland to Vancouver where late by an hour... That created a lot of anxiety that I would make it between flights, and had my husband waiting many hours for me in Vancouver to pick me up. Can there not be another plane on standby for when delays happen. The weather was not stormy, whatever the reason for the delay it happens a lot! Talking to local kiwis. No one is happy about it. The planes are also quite cold. I realise there is a belief that the cold helps one sleep, but that's a myth. It really doesn't. There is a certain warm temperature maybe a touch below body heat that is cosy to sleep. I dressed extra warm, with a t-shit, sweater and feather winter coat, still using the blanket for my legs, to stay warm on the flight back to Vancouver. It was uncomfortable in economy class. Not much room to stretch between two people. Everything else was lovely, the attendants, the food. I wish that there were more signs at the Auckland airport, knowing where to go would have been nice too. When I first landed in Auckland and had to go to domestic, it was my first time after 30 years. I asked someone where do I go? they said follow the line. They didn't say there was a bus, there were no signs saying free bus to and from domestic. It was pouring with rain, my plane again had arrived late from Brisbane, that time, air NZ all the way and I followed the line, hoping it was around the next corner, and the next corner, and the next... arriving soaked! With a few mins to spare to my auckland to whangarei flight. High anxiety that day too. When I went from Vancouver-Auckland-Brisbane. I again was confused with the signs to go international. And walking through the shops, would never have guest that was the way to go. I realise Auckland airport is getting construction done, maybe that will solve the way people go with better signs then. but for now its very confusing. Plus I saw someone purchase maple syrup at customs before their flight, and it was confiscated when they had their carry on bag checked. That doesn't seem right, made not want to purchase anything at customs. If its going to be confiscated. my recharger battery to use on the go to power charge my ipad and phone was confiscated that was over $100, would like my money back. It went from vancouver to brisbane to auckland and whangarei, then whangarei to auckland. but auckland to vancouver my luggage had the lock broken and a note saying they took it. kinda feel violated. Could customs not have called me over and asked me about it, and i could have carried it on in my carryon bag, because it seemed ok when i had it on my carry on, just not my suitcase. I ipad and phone have lithium batteries, didn't seem right. It was for charging when i was up north of newzealand on the beach. taking lots of photos needed it to recharge divices when there was no electricity driving in the car. anyway that was annoying. live and learn.
United Airlines
7.4
Good
9,065 reviews
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.2

Food

7.4

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Annabel,Dec 2025

WRE - AKL

Both my flights from Whangarei to Auckland and Auckland to Vancouver where late by an hour... That created a lot of anxiety that I would make it between flights, and had my husband waiting many hours for me in Vancouver to pick me up. Can there not be another plane on standby for when delays happen. The weather was not stormy, whatever the reason for the delay it happens a lot! Talking to local kiwis. No one is happy about it. The planes are also quite cold. I realise there is a belief that the cold helps one sleep, but that's a myth. It really doesn't. There is a certain warm temperature maybe a touch below body heat that is cosy to sleep. I dressed extra warm, with a t-shit, sweater and feather winter coat, still using the blanket for my legs, to stay warm on the flight back to Vancouver. It was uncomfortable in economy class. Not much room to stretch between two people. Everything else was lovely, the attendants, the food. I wish that there were more signs at the Auckland airport, knowing where to go would have been nice too. When I first landed in Auckland and had to go to domestic, it was my first time after 30 years. I asked someone where do I go? they said follow the line. They didn't say there was a bus, there were no signs saying free bus to and from domestic. It was pouring with rain, my plane again had arrived late from Brisbane, that time, air NZ all the way and I followed the line, hoping it was around the next corner, and the next corner, and the next... arriving soaked! With a few mins to spare to my auckland to whangarei flight. High anxiety that day too. When I went from Vancouver-Auckland-Brisbane. I again was confused with the signs to go international. And walking through the shops, would never have guest that was the way to go. I realise Auckland airport is getting construction done, maybe that will solve the way people go with better signs then. but for now its very confusing. Plus I saw someone purchase maple syrup at customs before their flight, and it was confiscated when they had their carry on bag checked. That doesn't seem right, made not want to purchase anything at customs. If its going to be confiscated. my recharger battery to use on the go to power charge my ipad and phone was confiscated that was over $100, would like my money back. It went from vancouver to brisbane to auckland and whangarei, then whangarei to auckland. but auckland to vancouver my luggage had the lock broken and a note saying they took it. kinda feel violated. Could customs not have called me over and asked me about it, and i could have carried it on in my carryon bag, because it seemed ok when i had it on my carry on, just not my suitcase. I ipad and phone have lithium batteries, didn't seem right. It was for charging when i was up north of newzealand on the beach. taking lots of photos needed it to recharge divices when there was no electricity driving in the car. anyway that was annoying. live and learn.
American Airlines
7.2
Good
11,047 reviews
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.2

Food

7.4

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Annabel,Dec 2025

WRE - AKL

Both my flights from Whangarei to Auckland and Auckland to Vancouver where late by an hour... That created a lot of anxiety that I would make it between flights, and had my husband waiting many hours for me in Vancouver to pick me up. Can there not be another plane on standby for when delays happen. The weather was not stormy, whatever the reason for the delay it happens a lot! Talking to local kiwis. No one is happy about it. The planes are also quite cold. I realise there is a belief that the cold helps one sleep, but that's a myth. It really doesn't. There is a certain warm temperature maybe a touch below body heat that is cosy to sleep. I dressed extra warm, with a t-shit, sweater and feather winter coat, still using the blanket for my legs, to stay warm on the flight back to Vancouver. It was uncomfortable in economy class. Not much room to stretch between two people. Everything else was lovely, the attendants, the food. I wish that there were more signs at the Auckland airport, knowing where to go would have been nice too. When I first landed in Auckland and had to go to domestic, it was my first time after 30 years. I asked someone where do I go? they said follow the line. They didn't say there was a bus, there were no signs saying free bus to and from domestic. It was pouring with rain, my plane again had arrived late from Brisbane, that time, air NZ all the way and I followed the line, hoping it was around the next corner, and the next corner, and the next... arriving soaked! With a few mins to spare to my auckland to whangarei flight. High anxiety that day too. When I went from Vancouver-Auckland-Brisbane. I again was confused with the signs to go international. And walking through the shops, would never have guest that was the way to go. I realise Auckland airport is getting construction done, maybe that will solve the way people go with better signs then. but for now its very confusing. Plus I saw someone purchase maple syrup at customs before their flight, and it was confiscated when they had their carry on bag checked. That doesn't seem right, made not want to purchase anything at customs. If its going to be confiscated. my recharger battery to use on the go to power charge my ipad and phone was confiscated that was over $100, would like my money back. It went from vancouver to brisbane to auckland and whangarei, then whangarei to auckland. but auckland to vancouver my luggage had the lock broken and a note saying they took it. kinda feel violated. Could customs not have called me over and asked me about it, and i could have carried it on in my carryon bag, because it seemed ok when i had it on my carry on, just not my suitcase. I ipad and phone have lithium batteries, didn't seem right. It was for charging when i was up north of newzealand on the beach. taking lots of photos needed it to recharge divices when there was no electricity driving in the car. anyway that was annoying. live and learn.
Air Canada
7.1
Good
10,500 reviews
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.2

Food

7.4

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Annabel,Dec 2025

WRE - AKL

Both my flights from Whangarei to Auckland and Auckland to Vancouver where late by an hour... That created a lot of anxiety that I would make it between flights, and had my husband waiting many hours for me in Vancouver to pick me up. Can there not be another plane on standby for when delays happen. The weather was not stormy, whatever the reason for the delay it happens a lot! Talking to local kiwis. No one is happy about it. The planes are also quite cold. I realise there is a belief that the cold helps one sleep, but that's a myth. It really doesn't. There is a certain warm temperature maybe a touch below body heat that is cosy to sleep. I dressed extra warm, with a t-shit, sweater and feather winter coat, still using the blanket for my legs, to stay warm on the flight back to Vancouver. It was uncomfortable in economy class. Not much room to stretch between two people. Everything else was lovely, the attendants, the food. I wish that there were more signs at the Auckland airport, knowing where to go would have been nice too. When I first landed in Auckland and had to go to domestic, it was my first time after 30 years. I asked someone where do I go? they said follow the line. They didn't say there was a bus, there were no signs saying free bus to and from domestic. It was pouring with rain, my plane again had arrived late from Brisbane, that time, air NZ all the way and I followed the line, hoping it was around the next corner, and the next corner, and the next... arriving soaked! With a few mins to spare to my auckland to whangarei flight. High anxiety that day too. When I went from Vancouver-Auckland-Brisbane. I again was confused with the signs to go international. And walking through the shops, would never have guest that was the way to go. I realise Auckland airport is getting construction done, maybe that will solve the way people go with better signs then. but for now its very confusing. Plus I saw someone purchase maple syrup at customs before their flight, and it was confiscated when they had their carry on bag checked. That doesn't seem right, made not want to purchase anything at customs. If its going to be confiscated. my recharger battery to use on the go to power charge my ipad and phone was confiscated that was over $100, would like my money back. It went from vancouver to brisbane to auckland and whangarei, then whangarei to auckland. but auckland to vancouver my luggage had the lock broken and a note saying they took it. kinda feel violated. Could customs not have called me over and asked me about it, and i could have carried it on in my carryon bag, because it seemed ok when i had it on my carry on, just not my suitcase. I ipad and phone have lithium batteries, didn't seem right. It was for charging when i was up north of newzealand on the beach. taking lots of photos needed it to recharge divices when there was no electricity driving in the car. anyway that was annoying. live and learn.

Related info for your journey

Find useful and relevant information for your journey from Sydney to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Sydney to Illinois?

    If you book a flight to Illinois from Sydney, you will be flying from Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 7.5 km from the centre of Sydney.

  • How long is the flight from Sydney to Illinois?

    Departing from Sydney to Illinois will take you 21h 17m. The distance between Sydney and Illinois is about 14571 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Sydney to Illinois?

    The most popular route from Sydney to Illinois is Sydney Kingsford Smith - Chicago O'Hare Intl. You may also consider Sydney Kingsford Smith - Chicago Midway or Sydney Kingsford Smith - Lambert-St Louis.

  • Can I find deals for flights from Sydney to Illinois that include hotel bookings?

    Yes. In addition to deals on Sydney to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Sydney to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sydney to Illinois.

  • Can I find deals for business class flights from Sydney to Illinois?

    Yes. Cheapflights offers flight deals from Sydney to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Sydney to Illinois?

    Currently, September is the cheapest month in which you can book a flight from Sydney to Illinois (average of $938). Flying from Sydney to Illinois in December is currently the most expensive (average of $1,588). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 6 airlines flying from Sydney to Illinois

Discover the top 6 airlines that operate flights from Sydney to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 5 December 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$994Average$1,132FlexibilityNo cancel feeOn-time74%
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American AirlinesCheapest$1,179Average$1,229FlexibilityNo cancel feeOn-time71%
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Air CanadaCheapest$1,182Average$1,705FlexibilityNo cancel feeOn-time67%
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Air New ZealandCheapest$1,431Average$1,593FlexibilityNo cancel feeOn-time78%
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ANACheapest$1,589Average$1,719FlexibilityNo cancel feeOn-time80%
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United AirlinesCheapest$1,613Average$2,288FlexibilityNo cancel feeOn-time69%
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How does Cheapflights help users find flights from Sydney to Illinois?

When you search for this flight from Sydney to Illinois, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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Can Cheapflights find flights from Sydney to Illinois with no change fees?

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