HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Australia

$463+ 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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
May 3 — May 101
Sun 5/3
Sun 5/10
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 April 3, 2026.

This Justfly.com deal was found by Cheapflights users on 3/31. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/243:40 pm
ORD
-
BNE
1 stop24h 25m
Air Canada
Sun 6/710:00 am
BNE
-
ORD
2 stops38h 34m
Air Canada
Deal found 3/31$964
This Justfly.com deal was found by Cheapflights users on 3/29. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/243:40 pm
ORD
-
BNE
1 stop24h 25m
Air Canada
Sun 5/3110:00 am
BNE
-
ORD
1 stop34h 40m
Air Canada
Deal found 3/29$965
This FlightHub deal was found by Cheapflights users on 3/31. 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.
Mon 5/258:45 am
ORD
-
BNE
2 stops31h 20m
Air Canada
Mon 6/810:00 am
BNE
-
ORD
2 stops38h 34m
Air Canada
Deal found 3/31$967
This Justfly.com deal was found by Cheapflights users on 3/30. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/163:40 pm
ORD
-
BNE
2 stops48h 25m
Air Canada
Sun 5/2410:00 am
BNE
-
ORD
1 stop19h 45m
Air Canada
Deal found 3/30$968
This Orbitz deal was found by Cheapflights users on 3/31. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/153:40 pm
ORD
-
BNE
1 stop24h 25m
Air Canada
Sun 5/2410:00 am
BNE
-
ORD
1 stop19h 45m
Air Canada
Deal found 3/31$992
This BusinessClass deal was found by Cheapflights users on 3/31. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/243:40 pm
ORD
-
BNE
1 stop24h 25m
Multiple Airlines
Tue 6/910:15 am
BNE
-
ORD
1 stop34h 25m
Multiple Airlines
Deal found 3/31$994
This FlightHub deal was found by Cheapflights users on 3/31. 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.
Tue 6/99:14 am
ORD
-
BNE
2 stops30h 51m
Air Canada
Thu 7/910:15 am
BNE
-
ORD
1 stop34h 25m
Air Canada
Deal found 3/31$1,002
This Trip.com deal was found by Cheapflights users on 3/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/166:55 am
ORD
-
BNE
3 stops36h 45m
Multiple Airlines
Sun 5/2411:35 am
BNE
-
ORD
3 stops48h 02m
Multiple Airlines
Deal found 3/30$1,006
This Justfly.com deal was found by Cheapflights users on 3/30. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/301:05 pm
STL
-
BNE
2 stops51h 00m
Air Canada
Thu 6/1110:15 am
BNE
-
STL
2 stops49h 28m
Air Canada
Deal found 3/30$1,023
This Trip.com deal was found by Cheapflights users on 3/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/266:00 am
MDW
-
MEL
3 stops39h 25m
Multiple Airlines
Wed 5/61:25 pm
MEL
-
MDW
3 stops36h 47m
Multiple Airlines
Deal found 3/30$1,071
This Priceline deal was found by Cheapflights users on 3/30. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/143:40 pm
ORD
-
ADL
2 stops31h 45m
Air Canada
Thu 5/218:00 pm
ADL
-
ORD
2 stops48h 10m
Air Canada
Deal found 3/30$1,083
This Trip.com deal was found by Cheapflights users on 4/1. 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.
Sat 5/166:55 am
ORD
-
MEL
3 stops38h 05m
Multiple Airlines
Sat 5/231:30 pm
MEL
-
ORD
3 stops46h 02m
Multiple Airlines
Deal found 4/1$1,097

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 April 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$951
(Trip.com)

One-way from

$463
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$1,442
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. 2% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
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 April 3, 2026.
Use the filters below to find and compare flights from Illinois to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 6/27

4:45 pm-7:05 am

2 stops23h 20m

Brisbane

Sun 7/5

10:00 am-11:57 pm

2 stops52h 57m

$1,175

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Wed 5/13

1:05 pm-7:05 am

2 stops27h 00m

Brisbane

Wed 5/20

7:25 pm-8:09 pm

3 stops39h 44m

$1,180

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Wed 5/13

1:05 pm-7:05 am

2 stops27h 00m

Brisbane

Wed 5/20

10:00 am-12:06 pm

2 stops41h 06m

$1,226

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 5/18

1:05 pm-7:05 am

2 stops27h 00m

Brisbane

Mon 5/25

8:45 pm-12:06 pm

3 stops54h 21m

$1,247

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 5/18

6:21 am-5:00 am

1 stop31h 39m

Brisbane

Mon 5/25

8:35 pm-8:32 am

2 stops26h 57m

$1,327

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 4/27

11:25 am-7:10 pm

2 stops40h 45m

Sydney Kingsford Smith

Tue 5/5

9:05 pm-9:40 am

2 stops51h 35m

$1,434

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/6

6:36 am-4:00 pm

2 stops42h 24m

Sydney Kingsford Smith

Sun 7/19

12:00 pm-4:33 pm

1 stop19h 33m

$1,442

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Wed 5/13

4:44 pm-7:30 am

2 stops23h 46m

Melbourne

Wed 8/12

10:55 am-7:31 pm

2 stops23h 36m

$1,461

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 5/19

4:06 pm-8:15 am

2 stops25h 09m

Melbourne

Sat 8/15

10:55 am-6:24 pm

1 stop22h 29m

$1,461

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 5/19

3:20 pm-8:15 am

2 stops25h 55m

Melbourne

Thu 8/13

10:55 am-7:31 pm

2 stops23h 36m

$1,461

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 60 resultsSorted by cheapest first
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 February is currently the most expensive (average of $870). 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 28h 40m. Illinois and Australia are separated by a distance of 9660 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 Qantas Airways and ANA, with prices starting from $421 and $676, 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 February is currently the most expensive (average of $870). 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.

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 April 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$198Average$1,623FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$712Average$1,103FlexibilityNo cancel feeOn-time67%
Fiji AirwaysCheapest$716Average$1,303FlexibilityNo cancel feeOn-time74%
Qantas AirwaysCheapest$836Average$1,704FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$870Average$1,659FlexibilityNo cancel feeOn-time69%
DeltaCheapest$1,034Average$1,467FlexibilityNo cancel feeOn-timeN/A
ANACheapest$1,177Average$1,259FlexibilityNo cancel feeOn-time80%
Air New ZealandCheapest$1,217Average$1,489FlexibilityNo cancel feeOn-time78%
Qatar AirwaysCheapest$1,263Average$1,762FlexibilityNo cancel feeOn-time68%
Cathay PacificCheapest$1,470Average$1,835FlexibilityNo 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.