HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Australia

$434+ Cheap flights from Illinois to Australia

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 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
Jan 30 — Feb 61
Fri 1/30
Fri 2/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Australia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Illinois to Australia

Cheapest flights from Illinois to Australia
Explore the most affordable flight options available from Illinois to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 31, 2025.

This oojo deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/303:13 pmORD - SYD
1 stop24h 47mQantas Airways
Tue 1/137:05 amSYD - ORD
2 stops26h 44mQantas Airways
Deal found 12/29$1,064
This United Airlines deal was found by Cheapflights users on 12/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:30 amSTL - MEL
2 stops30h 30mUnited Airlines
Wed 1/1411:30 amMEL - STL
2 stops27h 30mUnited Airlines
Deal found 12/30$1,277
This oojo deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/314:46 pmORD - SYD
2 stops31h 54mQantas Airways
Mon 1/197:05 amSYD - ORD
2 stops24h 52mQantas Airways
Deal found 12/29$1,377
This oojo deal was found by Cheapflights users on 12/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:30 pmSTL - SYD
2 stops30h 20mQantas Airways
Wed 1/75:50 pmSYD - STL
2 stops37h 57mQantas Airways
Deal found 12/30$1,377
This oojo deal was found by Cheapflights users on 12/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/314:46 pmORD - SYD
2 stops31h 54mQantas Airways
Sun 1/254:20 pmSYD - ORD
2 stops41h 29mQantas Airways
Deal found 12/28$1,400
This United Airlines deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:45 pmSTL - MEL
2 stops26h 15mUnited Airlines
Tue 1/61:00 pmMEL - STL
2 stops24h 58mUnited Airlines
Deal found 12/29$1,482
This Air Canada deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:00 pmORD - SYD
2 stops26h 35mAir Canada
Mon 1/194:00 pmSYD - ORD
1 stop41h 42mAir Canada
Deal found 12/29$1,548
This FlightHub deal was found by Cheapflights users on 12/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:00 pmORD - SYD
1 stop26h 35mAir Canada
Sun 1/2511:20 amSYD - ORD
1 stop20h 21mAir Canada
Deal found 12/28$1,553
This Kiwi.com deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:02 pmORD - SYD
1 stop44h 23mMultiple Airlines
Sun 1/255:45 pmSYD - ORD
2 stops34h 37mMultiple Airlines
Deal found 12/29$1,594
This CrystalTravel deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:25 pmORD - SYD
1 stop34h 50mANA
Sun 1/259:45 pmSYD - ORD
1 stop26h 35mANA
Deal found 12/29$1,606
This CrystalTravel deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:25 pmORD - SYD
1 stop34h 50mANA
Sat 1/2412:25 pmSYD - ORD
2 stops33h 50mANA
Deal found 12/29$1,615
This Trip.com deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:12 amMDW - SYD
2 stops33h 48mMultiple Airlines
Mon 1/195:45 pmSYD - MDW
2 stops35h 20mMultiple Airlines
Deal found 12/29$1,629

Find flight deals from Illinois to Australia

Keep the following information in mind while searching for Illinois to Australia flight deals. Data was last updated December 31, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$853
(BestPriceTravel)

One-way from

$434
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$1,403
Provider with most accurate pricing for Chicago (CHI)-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Sydney Kingsford Smith flights.
Search Deals
From Illinois to Australia
Search Deals
One-way flight from Illinois to Australia
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($185 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($41 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Australia 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 2,558,603 searches. Data last updated December 31, 2025.
Use the filters below to find and compare flights from Illinois to Australia that are best for you.

Fly from

Illinois

Fly to

Australia

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 2/1

6:40 pm-9:00 am

1 stop21h 20m

Sydney Kingsford Smith

Sun 2/8

7:05 am-2:57 pm

2 stops24h 52m

$918

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 2/8

7:04 am-9:00 am

1 stop32h 56m

Sydney Kingsford Smith

Sun 2/15

7:05 am-11:48 pm

2 stops33h 43m

$918

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Mon 2/23

4:45 pm-5:10 pm

2 stops32h 25m

Brisbane

Sun 3/8

7:40 pm-4:36 pm

1 stop35h 56m

$936

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Wed 2/18

4:45 pm-5:10 pm

2 stops32h 25m

Brisbane

Sun 3/8

7:40 pm-4:36 pm

1 stop35h 56m

$936

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 1/28

6:40 pm-9:00 am

1 stop21h 20m

Sydney Kingsford Smith

Wed 2/4

7:15 pm-2:57 pm

2 stops36h 42m

$940

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 2/9

3:10 pm-8:50 pm

2 stops36h 40m

Sydney Kingsford Smith

Mon 2/16

11:20 am-4:37 pm

1 stop22h 17m

$940

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 3/9

6:50 pm-8:50 pm

2 stops34h 00m

Sydney Kingsford Smith

Mon 3/16

11:20 am-11:59 pm

1 stop28h 39m

$940

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 1/22

7:04 am-8:50 pm

2 stops44h 46m

Sydney Kingsford Smith

Thu 1/29

11:20 am-11:59 pm

1 stop29h 39m

$941

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 3/15

6:38 am-9:00 am

1 stop34h 22m

Sydney Kingsford Smith

Tue 3/24

5:50 pm-3:28 pm

2 stops37h 38m

$941

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Tue 2/10

1:05 pm-8:45 am

1 stop27h 40m

Brisbane

Sun 2/22

10:45 am-2:41 pm

1 stop19h 56m

$958

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/30

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Illinois to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia from Illinois with our price prediction graph.
Estimated round-trip 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 Australia

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

Currently, August is the cheapest month in which you can book a flight from Illinois to Australia (average of $198). Flying from Illinois to Australia in October is currently the most expensive (average of $832). 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.

Related info for your journey

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

  • How long is the flight from Illinois to Australia?

    Departing from Illinois to Australia will take you 21h 20m. Illinois and Australia are separated by a distance of 9228 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Illinois to Australia one-way?

    $229 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on ANA and Qantas Airways, with prices starting from $304 and $344, respectively.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Illinois to Australia (average of $198). Flying from Illinois to Australia in October is currently the most expensive (average of $832). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Australia

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Sydney flights
Los Angeles to Auckland flights
Los Angeles to Papeete flights
John F Kennedy Intl to Sydney flights
San Francisco to Auckland flights
Los Angeles to Melbourne flights
Dallas/Fort Worth to Sydney flights
Newark to Sydney flights
Dallas/Fort Worth to Auckland flights
John F Kennedy Intl to Auckland flights
San Francisco to Sydney flights
John F Kennedy Intl to Melbourne flights
LaGuardia to Sydney flights
San Francisco to Papeete flights
Seattle to Auckland flights
Newark to Melbourne flights
Dallas/Fort Worth to Melbourne flights
San Francisco to Melbourne flights
Los Angeles to Brisbane flights
Ontario to Sydney flights
Dulles Intl to Sydney flights
Dulles Intl to Melbourne flights
Seattle to Sydney flights
Honolulu to Sydney flights
Santa Ana to Sydney flights
Hobby to Sydney flights
Newark to Auckland flights
Seattle to Melbourne flights
O'Hare Intl to Sydney flights
Ontario to Papeete flights
Dulles Intl to Auckland flights
LaGuardia to Auckland flights
LaGuardia to Melbourne flights
Reagan-National to Melbourne flights
Honolulu to Auckland flights
Seattle to Papeete flights
Baltimore to Melbourne flights
George Bush Intcntl to Sydney flights
O'Hare Intl to Melbourne flights
Dallas/Fort Worth to Brisbane flights
Baltimore to Sydney flights
Ontario to Auckland flights
Reagan-National to Sydney flights
Los Angeles to Nadi flights
Hobby to Melbourne flights
O'Hare Intl to Auckland flights
Boston to Auckland flights
Boston to Sydney flights
Baltimore to Auckland flights
Hobby to Auckland flights

Top 10 airlines flying from Illinois to Australia

Discover the top 10 airlines that operate flights from Illinois to Australia. 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 2,558,603 searches. Data last updated December 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$675Average$1,323FlexibilityNo cancel feeOn-time74%
ANACheapest$679Average$1,209FlexibilityNo cancel feeOn-time80%
American AirlinesCheapest$796Average$1,143FlexibilityNo cancel feeOn-time71%
Fiji AirwaysCheapest$796Average$1,422FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$870Average$1,477FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$872Average$1,240FlexibilityNo cancel feeOn-time67%
DeltaCheapest$935Average$1,034FlexibilityNo cancel feeOn-timeN/A
Qatar AirwaysCheapest$1,229Average$2,092FlexibilityNo cancel feeOn-time68%
Air New ZealandCheapest$1,264Average$1,512FlexibilityNo cancel feeOn-time78%
Cathay PacificCheapest$1,418Average$1,773FlexibilityNo cancel feeOn-time72%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.