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$605+ 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 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
Jul 9 — Jul 161
Thu 7/9
Thu 7/16
1 adult, Economy
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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 June 9, 2026.

This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2012:43 pm
STL
-
MEL
2 stops26h 02m
American Airlines
Tue 11/312:00 pm
MEL
-
STL
1 stop24h 30m
American Airlines
Deal found 6/9$1,086
This KAYAK deal was found by Cheapflights users on 6/4. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/307:23 pm
STL
-
MEL
1 stop21h 52m
Multiple Airlines
Fri 7/3110:55 am
MEL
-
STL
1 stop22h 22m
Multiple Airlines
Deal found 6/4$1,092
This United Airlines deal was found by Cheapflights users on 6/4. 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.
Tue 6/306:01 am
STL
-
MEL
2 stops35h 14m
United Airlines
Fri 7/3110:55 am
MEL
-
STL
1 stop22h 22m
United Airlines
Deal found 6/4$1,093
This American Airlines deal was found by Cheapflights users on 6/5. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:30 am
STL
-
MEL
1 stop32h 15m
American Airlines
Wed 11/411:15 pm
MEL
-
STL
2 stops26h 12m
American Airlines
Deal found 6/5$1,095
This oojo deal was found by Cheapflights users on 6/9. 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 10/276:30 am
STL
-
MEL
1 stop35h 00m
Qantas Airways
Wed 11/1111:15 pm
MEL
-
STL
1 stop41h 27m
Qantas Airways
Deal found 6/9$1,096
This KAYAK deal was found by Cheapflights users on 6/5. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/208:42 am
STL
-
MEL
1 stop32h 33m
ANA
Sun 8/3010:55 am
MEL
-
STL
1 stop22h 44m
ANA
Deal found 6/5$1,100
This Delta deal was found by Cheapflights users on 6/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2411:51 am
STL
-
MEL
2 stops28h 59m
Delta
Tue 11/1012:00 pm
MEL
-
STL
2 stops23h 56m
Delta
Deal found 6/9$1,103
This Delta deal was found by Cheapflights users on 6/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/262:15 pm
STL
-
MEL
2 stops26h 35m
Delta
Tue 11/1012:00 pm
MEL
-
STL
2 stops23h 56m
Delta
Deal found 6/9$1,104
This Trip.com deal was found by Cheapflights users on 6/9. 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.
Tue 10/2712:43 pm
STL
-
MEL
1 stop24h 17m
Multiple Airlines
Wed 11/1111:15 pm
MEL
-
STL
1 stop41h 27m
Multiple Airlines
Deal found 6/9$1,130
This Qantas Airways deal was found by Cheapflights users on 6/9. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/293:33 pm
STL
-
MEL
1 stop21h 27m
Qantas Airways
Sun 11/812:00 pm
MEL
-
STL
1 stop21h 40m
Qantas Airways
Deal found 6/9$1,132
This Trip.com deal was found by Cheapflights users on 6/5. 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.
Thu 7/309:28 am
ORD
-
MEL
3 stops35h 32m
Multiple Airlines
Wed 8/121:25 pm
MEL
-
ORD
2 stops31h 52m
Multiple Airlines
Deal found 6/5$1,167
This Air Canada deal was found by Cheapflights users on 6/6. 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.
Sat 8/812:10 pm
STL
-
SYD
2 stops52h 10m
Air Canada
Sun 8/169:20 am
SYD
-
STL
2 stops48h 22m
Air Canada
Deal found 6/6$1,190

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 June 9, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,086
(American Airlines)

One-way from

$605
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$1,384
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. 5% potential increase in price ($83 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 9, 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

ChicagoMelbourne

MDW - MEL

MDWMEL

Chicago Midway

Thu 7/30

6:05 am-12:00 pm

3 stops38h 55m

Melbourne

Wed 8/12

1:25 pm-9:51 am

3 stops35h 26m

$1,233

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 10/30

5:11 pm-5:10 pm

2 stops32h 59m

Brisbane

Thu 11/12

1:10 pm-11:42 pm

1 stop26h 32m

$1,316

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 10/30

12:43 pm-5:50 am

2 stops26h 07m

Brisbane

Thu 11/12

1:10 pm-7:30 pm

2 stops22h 20m

$1,326

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 7/18

7:23 pm-8:15 am

1 stop21h 52m

Melbourne

Sat 7/25

6:00 am-6:17 pm

2 stops27h 17m

$1,376
Quickest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 8/8

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Sun 8/16

10:20 am-6:39 pm

1 stop23h 19m

$1,381

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 8/3

6:37 am-6:25 pm

2 stops44h 48m

Brisbane

Mon 8/31

8:45 pm-10:59 pm

2 stops41h 14m

$1,406

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 7/3

3:22 pm-6:55 am

2 stops24h 33m

Sydney Kingsford Smith

Fri 7/10

10:20 am-6:17 pm

1 stop22h 57m

$1,422

St. LouisMelbourne

STL - AVV

STLAVV

Lambert-St Louis

Tue 10/27

4:15 pm-11:15 pm

3 stops63h 00m

Melbourne Avalon

Wed 11/11

6:00 am-3:30 pm

3 stops50h 30m

$1,439

St. LouisMelbourne

STL - AVV

STLAVV

Lambert-St Louis

Tue 10/20

8:55 am-2:10 pm

3 stops37h 15m

Melbourne Avalon

Tue 11/3

6:00 am-3:30 pm

3 stops50h 30m

$1,440

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sun 7/19

7:23 pm-11:20 am

2 stops24h 57m

Melbourne

Sun 7/26

10:55 am-11:57 pm

2 stops28h 02m

$1,451

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/9

Showing 1-10 of 60 resultsSorted by cheapest first
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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, November is the cheapest month in which you can book a flight from Illinois to Australia (average of $113). Flying from Illinois to Australia in April is currently the most expensive (average of $716). 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.

How far ahead should I book a flight from Illinois to Australia?

Booking 47 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to Australia. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 26h 07m. Illinois and Australia are separated by a distance of 8745 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?

    $421 is the cheapest one-way deal found within the past few days, from Qantas Airways. You may also be able to find cheap deals on ANA and United Airlines, with prices starting from $691 and $835, 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, November is the cheapest month in which you can book a flight from Illinois to Australia (average of $113). Flying from Illinois to Australia in April is currently the most expensive (average of $716). 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 June 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$198Average$1,664FlexibilityNo cancel feeOn-time71%
DeltaCheapest$229Average$1,418FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$712Average$1,137FlexibilityNo cancel feeOn-time67%
Fiji AirwaysCheapest$716Average$1,212FlexibilityNo cancel feeOn-time74%
Qantas AirwaysCheapest$836Average$1,524FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$870Average$1,699FlexibilityNo cancel feeOn-time69%
ANACheapest$1,193Average$1,288FlexibilityNo cancel feeOn-time80%
Air New ZealandCheapest$1,217Average$1,517FlexibilityNo cancel feeOn-time78%
Qatar AirwaysCheapest$1,263Average$1,762FlexibilityNo cancel feeOn-time68%
Cathay PacificCheapest$1,560Average$1,973FlexibilityNo cancel feeOn-time72%

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