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Cheap flights from Sydney to Illinois from $775

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 22/10. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
13 Nov — 20 Nov1
1 adult
1 adult, Economy

Find 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 14 October 2025.

Wed 12/1111:45SYD - ORD
2 stops25h 40mAir New Zealand
Thu 27/1113:00ORD - SYD
2 stops30h 40mAir New Zealand
Deal found 13/10$1,520
Sun 2/1109:55SYD - ORD
2 stops31h 20mAir New Zealand
Mon 17/1114:30ORD - SYD
2 stops27h 00mAir New Zealand
Deal found 13/10$1,522
Mon 17/1114:00SYD - ORD
2 stops26h 00mMultiple Airlines
Sun 23/1108:10ORD - SYD
2 stops35h 20mMultiple Airlines
Deal found 12/10$1,555
Fri 28/1113:55SYD - ORD
2 stops22h 35mAir New Zealand
Fri 5/1213:00ORD - SYD
2 stops26h 45mAir New Zealand
Deal found 13/10$1,588
Sat 1/1114:30SYD - ORD
2 stops24h 30mMultiple Airlines
Sun 16/1106:30ORD - SYD
2 stops37h 00mMultiple Airlines
Deal found 12/10$1,597
Wed 15/1008:45SYD - ORD
2 stops29h 52mAir New Zealand
Fri 24/1016:50ORD - SYD
2 stops25h 40mAir New Zealand
Deal found 13/10$1,608
Thu 27/1109:55SYD - STL
2 stops25h 57mAir New Zealand
Thu 4/1206:15STL - SYD
2 stops37h 25mAir New Zealand
Deal found 12/10$1,611
Fri 28/1109:55SYD - STL
2 stops25h 51mAir New Zealand
Fri 5/1206:15STL - SYD
2 stops35h 15mAir New Zealand
Deal found 13/10$1,646
Wed 12/1111:20SYD - ORD
2 stops25h 40mAir Canada
Thu 27/1115:40ORD - SYD
1 stop24h 55mAir Canada
Deal found 14/10$1,657
Wed 26/1109:55SYD - ORD
2 stops26h 35mAir New Zealand
Wed 3/1214:35ORD - SYD
2 stops26h 55mAir New Zealand
Deal found 12/10$1,721
Thu 13/1111:20SYD - ORD
1 stop20h 21mAir Canada
Thu 20/1115:40ORD - SYD
1 stop24h 55mAir Canada
Deal found 13/10$1,726
Sun 2/1111:20SYD - ORD
2 stops25h 40mAir Canada
Mon 17/1115:40ORD - SYD
1 stop24h 55mAir Canada
Deal found 13/10$1,730

Cheap flight deals from Sydney to Illinois

Keep the following information in mind while searching for Sydney to Illinois flight deals. Data was last updated 14 October 2025.

Round-trip from

$1,520

One-way from

$775

Popular in

December

Cheapest in

March

Average price

$1,723
Air New Zealand
  • Air New Zealand
  • 12/11-27/11
  • 4 total stops
  • 56h 20m total
  • Sydney to Illinois
Search Deals
22/10
  • 22/10
  • 3 total stops
  • 47h 06m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($664 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($113 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 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 14 October 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

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 2/11

09:55-01:15

2 stops31h 20m

Chicago O'Hare Intl

Mon 17/11

14:30-10:30

2 stops27h 00m

$1,522

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 17/11

14:00-23:00

2 stops26h 00m

Chicago O'Hare Intl

Sun 23/11

08:10-12:30

2 stops35h 20m

$1,555

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 28/11

13:55-19:30

2 stops22h 35m

Chicago O'Hare Intl

Fri 5/12

13:00-08:45

2 stops26h 45m

$1,588

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 27/11

09:55-18:52

2 stops25h 57m

Lambert-St Louis

Thu 4/12

06:15-12:40

2 stops37h 25m

$1,611

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 28/11

09:55-18:46

2 stops25h 51m

Lambert-St Louis

Fri 5/12

06:15-10:30

2 stops35h 15m

$1,646

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 26/1

11:20-14:41

1 stop20h 21m

Chicago O'Hare Intl

Thu 30/4

15:40-07:20

1 stop24h 40m

$1,666

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 2/2

11:20-14:41

1 stop20h 21m

Chicago O'Hare Intl

Thu 30/4

15:40-07:20

1 stop24h 40m

$1,666

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 12/11

11:20-14:41

1 stop20h 21m

Chicago O'Hare Intl

Thu 27/11

15:40-09:35

1 stop24h 55m

$1,677

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 26/11

09:55-19:30

2 stops26h 35m

Chicago O'Hare Intl

Wed 3/12

14:35-10:30

2 stops26h 55m

$1,721

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 28/11

11:20-16:08

1 stop21h 48m

Chicago O'Hare Intl

Fri 5/12

18:17-09:00

1 stop21h 43m

$1,796

Flights are sorted by cheapest return flights first.

Deals found on 11/10

Showing 1-10 of 59 results
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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 $951). Flying from Sydney to Illinois in December is currently the most expensive (average of $1,606). 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 14 October 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 at midday could potentially save you up to 28% 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 14 October 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
513 reviews
Check prices

Comfort

8.0

Entertainment

7.4

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
6.0
Good

Anonymous,July 2025

AKL - SFO

Flight was delayed an hour. We had just flown Air NZ on a 12- hour flight from AKL so the extra delay on this connecting flight wasn’t welcomed.
Air New Zealand
8.0
Very Good
513 reviews
Air New Zealand
8.0
Very Good
513 reviews
Check prices

Comfort

8.0

Entertainment

7.4

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
6.0
Good

Anonymous,July 2025

AKL - SFO

Flight was delayed an hour. We had just flown Air NZ on a 12- hour flight from AKL so the extra delay on this connecting flight wasn’t welcomed.
Qantas Airways
7.5
Good
919 reviews
Air New Zealand
8.0
Very Good
513 reviews
Check prices

Comfort

8.0

Entertainment

7.4

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
6.0
Good

Anonymous,July 2025

AKL - SFO

Flight was delayed an hour. We had just flown Air NZ on a 12- hour flight from AKL so the extra delay on this connecting flight wasn’t welcomed.
United Airlines
7.4
Good
8,975 reviews
Air New Zealand
8.0
Very Good
513 reviews
Check prices

Comfort

8.0

Entertainment

7.4

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
6.0
Good

Anonymous,July 2025

AKL - SFO

Flight was delayed an hour. We had just flown Air NZ on a 12- hour flight from AKL so the extra delay on this connecting flight wasn’t welcomed.
American Airlines
7.2
Good
11,043 reviews
Air New Zealand
8.0
Very Good
513 reviews
Check prices

Comfort

8.0

Entertainment

7.4

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
6.0
Good

Anonymous,July 2025

AKL - SFO

Flight was delayed an hour. We had just flown Air NZ on a 12- hour flight from AKL so the extra delay on this connecting flight wasn’t welcomed.
Air Canada
7.1
Good
10,293 reviews
Air New Zealand
8.0
Very Good
513 reviews
Check prices

Comfort

8.0

Entertainment

7.4

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
6.0
Good

Anonymous,July 2025

AKL - SFO

Flight was delayed an hour. We had just flown Air NZ on a 12- hour flight from AKL so the extra delay on this connecting flight wasn’t welcomed.

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 20h 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 cheapest airlines to fly from Sydney to Illinois one-way?

    The cheapest airline one-way is Etihad Airways, with whom users have recently found tickets for as low as $1,003. However, be on the lookout for offers from American Airlines and Alaska Airlines, as they are both options that can get you from Sydney to Illinois for a low price.

  • 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 $951). Flying from Sydney to Illinois in December is currently the most expensive (average of $1,606). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Sydney to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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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 14 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,010Average$1,152FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
American AirlinesCheapest$1,196Average$1,248FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapest$1,210Average$1,720FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Air New ZealandCheapest$1,451Average$1,611FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
ANACheapest$1,611Average$1,743FlexibilityNo cancel feeOn-time80%
Search ANA flights
United AirlinesCheapest$1,664Average$2,396FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

Why should you use Cheapflights to find cheap flight tickets from Sydney to Illinois?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Sydney to Illinois.

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

Yes! Cheapflights helps users easily find flights from Sydney to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Sydney to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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