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Cheap flights from Sydney to Illinois from $935

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 15/2. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
3 Jan — 10 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 4 December 2025.

Wed 3/1211:20SYD - ORD
1 stop21h 42mAmerican Airlines
Wed 31/1215:13ORD - SYD
1 stop24h 47mAmerican Airlines
Deal found 2/12$1,491
Wed 3/1211:20SYD - ORD
2 stops37h 40mAir Canada
Wed 31/1212:50ORD - SYD
2 stops27h 45mAir Canada
Deal found 2/12$1,518
Sun 7/1217:45SYD - STL
1 stop23h 12mQantas Airways
Sun 14/1213:20STL - SYD
1 stop24h 35mQantas Airways
Deal found 2/12$1,571
Sun 7/1211:20SYD - STL
2 stops25h 07mAmerican Airlines
Sun 14/1213:20STL - SYD
2 stops26h 40mAmerican Airlines
Deal found 2/12$1,572
Thu 4/1210:40SYD - MDW
2 stops30h 07mDelta
Mon 8/1218:40MDW - SYD
2 stops44h 50mDelta
Deal found 30/11$1,803
Thu 25/1211:20SYD - ORD
1 stop20h 12mUnited Airlines
Fri 23/114:40ORD - SYD
1 stop25h 35mUnited Airlines
Deal found 2/12$1,873
Wed 24/1211:50SYD - ORD
1 stop27h 47mUnited Airlines
Fri 2/118:25ORD - SYD
1 stop21h 50mUnited Airlines
Deal found 1/12$1,875
Thu 25/1211:20SYD - ORD
1 stop36h 39mAmerican Airlines
Fri 23/111:44ORD - SYD
2 stops27h 31mAmerican Airlines
Deal found 2/12$1,908
Thu 25/1211:20SYD - ORD
1 stop20h 21mAir Canada
Fri 23/115:35ORD - SYD
1 stop25h 00mAir Canada
Deal found 3/12$2,070
Wed 3/1210:40SYD - MDW
2 stops22h 54mDelta
Wed 31/1209:50MDW - SYD
2 stops29h 40mDelta
Deal found 2/12$2,509
Sun 21/1211:20SYD - MDW
2 stops29h 01mMultiple Airlines
Mon 5/114:16MDW - SYD
2 stops49h 44mMultiple Airlines
Deal found 1/12$2,787
Sun 14/1210:40SYD - MDW
2 stops30h 07mDelta
Fri 2/109:50MDW - SYD
2 stops29h 40mDelta
Deal found 2/12$3,289

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 4 December 2025.

Round-trip from

$1,302

One-way from

$935

Popular in

December

Cheapest in

March

Average price

$2,257
Air Canada
  • Air Canada
  • 4/3-8/3
  • 4 total stops
  • 84h 36m total
  • Sydney to Illinois
Search Deals
15/2
  • 15/2
  • 2 total stops
  • 27h 45m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($687 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($102 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 4 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

$1,483

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Tue 20/1

10:40-17:29

2 stops23h 49m

Chicago Midway

Tue 27/1

09:50-06:50

2 stops28h 00m

$1,504

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 16/5

09:10-15:56

1 stop21h 46m

Chicago O'Hare Intl

Sat 6/6

17:36-07:05

2 stops22h 29m

$1,626

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

$1,645

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

$1,648

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 10/4

09:20-08:02

2 stops37h 42m

Chicago O'Hare Intl

Sat 18/4

08:46-07:20

1 stop31h 34m

$1,691

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 16/1

11:20-14:41

1 stop20h 21m

Chicago O'Hare Intl

Fri 23/1

15:35-14:40

2 stops30h 05m

$1,741

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

$1,759

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

$1,797

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Thu 15/1

14:15-22:07

2 stops24h 52m

Chicago Midway

Thu 22/1

13:26-06:50

2 stops24h 24m

$1,878

Flights are sorted by cheapest return flights first.

Deals found on 2/12

Showing 1-10 of 50 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 $941). Flying from Sydney to Illinois in December is currently the most expensive (average of $1,594). 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 4 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 4 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

Food

7.4

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.
Air New Zealand
8.0
Very Good
544 reviews
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Food

7.4

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.
Qantas Airways
7.5
Good
947 reviews
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Food

7.4

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.
United Airlines
7.4
Good
9,063 reviews
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Food

7.4

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.
American Airlines
7.2
Good
11,045 reviews
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Food

7.4

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.
Air Canada
7.1
Good
10,500 reviews
Air New Zealand
8.0
Very Good
544 reviews
Check prices

Food

7.4

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.

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 46m. The distance between Sydney and Illinois is about 14851 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 $941). Flying from Sydney to Illinois in December is currently the most expensive (average of $1,594). 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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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 4 December 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$998Average$1,136FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
American AirlinesCheapest$1,184Average$1,233FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapest$1,186Average$1,711FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Air New ZealandCheapest$1,436Average$1,599FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
ANACheapest$1,595Average$1,725FlexibilityNo cancel feeOn-time80%
Search ANA flights
United AirlinesCheapest$1,618Average$2,297FlexibilityNo 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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