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Cheap flights from Illinois to Sydney from $830

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 26/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
9 Jan — 16 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Illinois to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from Illinois to Sydney
Explore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 December 2025.

Tue 9/1218:17ORD - SYD
1 stop21h 43mQantas Airways
Wed 14/119:15SYD - ORD
2 stops36h 42mQantas Airways
Deal found 7/12$1,469
Tue 9/1213:35STL - SYD
2 stops24h 20mAir Canada
Tue 16/1211:20SYD - STL
2 stops42h 19mAir Canada
Deal found 8/12$1,731
Mon 8/1213:35STL - SYD
2 stops27h 00mAir Canada
Mon 15/1211:20SYD - STL
2 stops42h 19mAir Canada
Deal found 7/12$1,859
Thu 25/1206:00ORD - SYD
2 stops32h 25mMultiple Airlines
Sun 18/111:20SYD - ORD
2 stops41h 48mMultiple Airlines
Deal found 7/12$1,875
Sun 7/1218:17ORD - SYD
2 stops27h 33mQantas Airways
Sun 14/1208:55SYD - ORD
2 stops24h 59mQantas Airways
Deal found 6/12$2,014
Sun 7/1206:50ORD - SYD
1 stop31h 35mMultiple Airlines
Sat 13/1217:45SYD - ORD
1 stop23h 28mMultiple Airlines
Deal found 6/12$2,035
Thu 11/1215:11ORD - SYD
2 stops30h 54mQantas Airways
Wed 24/1207:05SYD - ORD
2 stops26h 24mQantas Airways
Deal found 8/12$2,174
Tue 9/1218:17ORD - SYD
2 stops44h 18mQantas Airways
Tue 30/1206:20SYD - ORD
2 stops26h 25mQantas Airways
Deal found 8/12$2,207
Thu 11/1215:53ORD - SYD
2 stops23h 52mAir New Zealand
Tue 10/311:45SYD - ORD
2 stops24h 38mAir New Zealand
Deal found 7/12$2,210
Fri 12/1213:35STL - SYD
2 stops27h 00mAir Canada
Tue 30/1211:20SYD - STL
2 stops45h 09mAir Canada
Deal found 9/12$2,235
Thu 11/1213:20STL - SYD
2 stops25h 40mQantas Airways
Sat 13/1219:40SYD - STL
2 stops45h 17mQantas Airways
Deal found 7/12$2,249
Wed 24/1218:02ORD - SYD
1 stop44h 23mMultiple Airlines
Wed 28/112:15SYD - ORD
2 stops42h 35mMultiple Airlines
Deal found 8/12$2,261

Find flight deals from Illinois to Sydney

Keep the following information in mind while searching for Illinois to Sydney flight deals. Data was last updated 10 December 2025.

Round-trip from

$1,357

One-way from

$830

Popular in

December

Cheapest in

August

Average price

$2,113
Qantas Airways
  • Qantas Airways
  • 20/1-28/1
  • 3 total stops
  • 46h 12m total
  • Illinois to Sydney
Search Deals
26/1
  • 26/1
  • 3 total stops
  • 45h 15m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($425 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($93 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 Illinois to Sydney 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 10 December 2025.
Use the filters below to find and compare flights from Illinois to Sydney that are best for you.

Fly from

Illinois

Fly to

Sydney

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 6/2

07:04-09:20

2 stops33h 16m

Sydney Kingsford Smith

Tue 10/2

14:05-16:14

1 stop19h 09m

$1,661

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 6/2

18:00-09:35

2 stops46h 35m

Sydney Kingsford Smith

Tue 10/2

11:20-20:58

2 stops26h 38m

$1,687

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

14:33-07:20

2 stops25h 47m

Sydney Kingsford Smith

Mon 18/5

09:20-15:16

2 stops44h 56m

$1,708

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:30-07:20

3 stops50h 50m

Sydney Kingsford Smith

Mon 18/5

09:20-15:16

2 stops44h 56m

$1,716

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 28/1

11:55-06:55

1 stop26h 00m

Sydney Kingsford Smith

Wed 4/2

14:05-19:29

1 stop22h 24m

$1,728

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 24/5

09:30-06:35

2 stops30h 05m

Sydney Kingsford Smith

Mon 8/6

09:25-14:00

1 stop19h 35m

$1,740

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 2/5

16:09-06:55

1 stop23h 46m

Sydney Kingsford Smith

Sat 16/5

12:00-16:11

1 stop19h 11m

$1,740

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

06:30-07:30

1 stop34h 00m

Sydney Kingsford Smith

Mon 18/5

09:10-23:16

1 stop29h 06m

$1,741

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 21/1

14:40-06:20

1 stop22h 40m

Sydney Kingsford Smith

Wed 28/1

12:10-16:57

1 stop21h 47m

$1,752

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 24/5

12:15-06:35

2 stops27h 20m

Sydney Kingsford Smith

Sun 7/6

09:25-21:52

2 stops27h 27m

$1,756

Flights are sorted by cheapest return flights first.

Deals found on 7/12

Showing 1-10 of 57 results
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Best time to book a flight from Illinois to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Illinois 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 Illinois to Sydney

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

Currently, August is the cheapest month in which you can book a flight from Illinois to Sydney (average of $298). Flying from Illinois to Sydney in January is currently the most expensive (average of $1,282). 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 IL to SYD?

Find hourly flight availability from Illinois to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 10 December 2025.

Unlike at midday, when flights are generally more expensive, you can save up to 39% on flights from Illinois to Sydney by exploring options for tickets in the afternoon.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Sydney. 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 into for flights to Sydney from Illinois?

    Located just 7.5 km from the city centre, Sydney Kingsford Smith (SYD) is the airport most travelers will use when flying to Sydney from Illinois.

  • How long is the flight from Illinois to Sydney?

    A quick flight from Illinois to Sydney can take about 30h 05m. Qantas Airways provides one of the quickest options available for as low as $1,740. The distance between Illinois and Sydney is about 14851 km. Both multi-stop and direct flights can be found to your destination and back.

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

    When deciding which route to take from Illinois to Sydney, consider Chicago O'Hare Intl - Sydney Kingsford Smith, Chicago Midway - Sydney Kingsford Smith or Lambert-St Louis - Sydney Kingsford Smith, as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Illinois to Sydney 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 Illinois to Sydney?

    Currently, August is the cheapest month in which you can book a flight from Illinois to Sydney (average of $298). Flying from Illinois to Sydney in January is currently the most expensive (average of $1,282). 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

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Katoomba
Penrith
Terrigal
Manly
Randwick
Lithgow
Coogee
Leura
Bondi Beach
Cronulla

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Top 2 airlines flying from Illinois to Sydney

Discover the top 2 airlines that operate flights from Illinois to Sydney. 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 10 December 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$1,291Average$1,304FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Qantas AirwaysCheapest$1,316Average$2,384FlexibilityNo cancel feeOn-time74%
Search Qantas Airways 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 Illinois to Sydney?

When you search for this flight from Illinois to Sydney, 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 Illinois to Sydney?

Millions of users choose and trust Cheapflights to book the best flight deals from Illinois to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

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

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

Of course! You can now track prices for flights from Illinois to Sydney and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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