What is the cheapest airline that flies from Illinois to Australia?

United Airlines, Qantas Airways, and Air Canada are the most popular carriers operating from Illinois to Australia

How long is the flight from Illinois to Australia?

Flight times from Illinois to Australia vary, but if you’re flying out of Peoria and flying into Sydney (one of the most popular routes), then the duration is 21h 12m on average. Another popular route from Illinois to Australia is flying from Chicago to Sydney, which will take roughly 25h 07m. Keep in mind that layovers or delays could extend your travel time.

What airlines fly to Australia?

Qantas Airways, Air Canada and United Airlines are the top three most popular airlines that fly to Australia from Illinois according to our data. Qantas Airways is the first choice among our users, with 45% of people opting to fly with this airline when traveling to Australia. Keep in mind that there are 10 different airlines that fly to Australia on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Illinois to Australia?

Prices for flights from Illinois to Australia refresh daily.

How many operators does momondo search for flights from Illinois to Australia?

As of August 2026, there are 10 operators available to choose from for flights from Illinois to Australia.

How old do you have to be to fly from Illinois to Australia?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Australia.

What documentation or ID do you need to fly to Australia?

The required travel and health documents for your Australia trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Australia. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$599 Cheap Flights from Illinois to Australia in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Australia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:45 pm - 10:40 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

26h 55m2 stops Los Angeles Auckland Intl

9:55 am - 9:35 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

26h 40m2 stops Auckland Intl Los Angeles

$1,223Air New Zealand

Tue, Sep 1 - Tue, Sep 8

3:48 pm - 10:40 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

27h 52m2 stops Los Angeles Auckland Intl

9:55 am - 9:35 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

26h 40m2 stops Auckland Intl Los Angeles

$1,223Air New Zealand

Tue, Sep 1 - Tue, Sep 8

5:45 pm - 7:10 pmORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

34h 25m1 stop Tokyo Haneda

9:45 pm - 8:40 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

26h 55m1 stop Tokyo Haneda

$1,224ANA

Sun, Sep 27 - Mon, Oct 12

6:50 pm - 5:50 pmORD Chicago O'Hare Intl-MEL Melbourne

30h 00m1 stop Doha Hamad Intl

11:40 pm - 2:30 pmMEL Melbourne-ORD Chicago O'Hare Intl

31h 50m1 stop Doha Hamad Intl

$1,225Qatar Airways

Mon, Nov 2 - Wed, Nov 11

7:45 pm - 7:10 pmORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

32h 25m2 stops Los Angeles Tokyo Haneda

9:45 pm - 8:40 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

26h 55m1 stop Tokyo Haneda

$1,229ANA

Sun, Sep 27 - Mon, Oct 12

6:50 pm - 11:20 pmORD Chicago O'Hare Intl-MEL Melbourne

35h 30m1 stop Doha Hamad Intl

11:40 pm - 2:30 pmMEL Melbourne-ORD Chicago O'Hare Intl

31h 50m1 stop Doha Hamad Intl

$1,233Qatar Airways

Sun, Nov 8 - Wed, Nov 18

11:55 am - 2:50 pmSTL Lambert-St Louis-SYD Sydney Kingsford Smith

33h 55m2 stops Dallas/Fort Worth Auckland Intl

2:05 pm - 4:14 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

19h 09m1 stop Dallas/Fort Worth

$1,242Qantas Airways

Tue, Feb 2 - Tue, Feb 9

10:22 am - 5:00 amSTL Lambert-St Louis-MEL Melbourne

26h 38m2 stops Charlotte Douglas Dallas/Fort Worth

10:45 pm - 8:07 amMEL Melbourne-STL Lambert-St Louis

26h 22m2 stops Los Angeles Charlotte Douglas

$1,244American Airlines

Tue, Oct 27 - Wed, Nov 11

5:40 am - 5:00 amSTL Lambert-St Louis-MEL Melbourne

31h 20m1 stop Dallas/Fort Worth

10:45 pm - 8:07 amMEL Melbourne-STL Lambert-St Louis

26h 22m2 stops Los Angeles Charlotte Douglas

$1,244American Airlines

Tue, Oct 27 - Wed, Nov 11

5:04 pm - 8:50 pmSTL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 46m2 stops Dallas/Fort Worth Auckland Intl

11:20 am - 11:59 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 39m1 stop Los Angeles

$1,289Qantas Airways

Wed, Feb 3 - Wed, Feb 10

Cheap last minute flights

Enter your travel dates to find the best prices.

9:15 am - 6:50 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

30h 35m2 stops Atlanta Hartsfield-Jackson Los Angeles

9:15 am - 6:55 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 40m2 stops Los Angeles Salt Lake City

$1,230Delta

Sun, Aug 9 - Sun, Aug 23

7:23 pm - 6:55 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

20h 32m1 stop San Francisco

10:20 am - 11:31 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

28h 11m2 stops San Francisco Denver Intl

$1,230United Airlines

Sun, Aug 9 - Sun, Aug 23

6:00 am - 7:05 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 05m1 stop Los Angeles

5:50 pm - 10:59 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

20h 09m1 stop Los Angeles

$1,245American Airlines

Sun, Aug 9 - Sun, Aug 23

3:40 pm - 7:20 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

24h 40m1 stop Vancouver Intl

9:20 am - 2:36 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

20h 16m1 stop Vancouver Intl

$1,322Air Canada

Tue, Aug 11 - Tue, Aug 25

3:40 pm - 7:20 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

24h 40m1 stop Vancouver Intl

9:20 am - 2:36 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

20h 16m1 stop Vancouver Intl

$1,322Air Canada

Mon, Aug 10 - Mon, Aug 24

9:13 pm - 7:30 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

43h 17m1 stop Los Angeles

5:50 pm - 5:59 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

27h 09m1 stop Los Angeles

$1,355Multiple Airlines

Tue, Aug 11 - Sun, Aug 23

9:13 pm - 7:30 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

43h 17m1 stop Los Angeles

5:50 pm - 5:59 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

27h 09m1 stop Los Angeles

$1,358Multiple Airlines

Tue, Aug 11 - Sun, Aug 23

12:46 pm - 6:50 amMDW Chicago Midway-SYD Sydney Kingsford Smith

27h 04m2 stops Atlanta Hartsfield-Jackson Los Angeles

9:15 am - 6:33 pmSYD Sydney Kingsford Smith-MDW Chicago Midway

24h 18m2 stops Los Angeles Detroit Metropolitan Wayne County

$1,616Delta

Tue, Aug 11 - Sun, Aug 16

3:22 pm - 7:30 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

25h 08m1 stop Los Angeles

9:10 am - 7:59 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

25h 49m1 stop Los Angeles

$1,657American Airlines

Sun, Aug 9 - Sat, Aug 15

2:35 pm - 4:10 pmORD Chicago O'Hare Intl-PER Perth

36h 35m2 stops San Francisco Brisbane

1:15 pm - 2:36 pmPER Perth-ORD Chicago O'Hare Intl

38h 21m2 stops Sydney Kingsford Smith Los Angeles

$2,306United Airlines

Wed, Aug 12 - Sat, Aug 29

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Air New Zealand flights from Illinois to Australia

Our best Air New Zealand deals on Illinois to Australia flight tickets

Air New Zealand

Oct 21

ORD2:10 pmChicago O'Hare Intl

26h 35m

2 stops

SYD8:45 amSydney Kingsford Smith

Nov 9

SYD9:55 amSydney Kingsford Smith

26h 01m

2 stops

ORD6:56 pmChicago O'Hare Intl

$1,223

Air New Zealand

Sep 1

ORD4:45 pmChicago O'Hare Intl

26h 55m

2 stops

SYD10:40 amSydney Kingsford Smith

Sep 8

SYD9:55 amSydney Kingsford Smith

26h 40m

2 stops

ORD9:35 pmChicago O'Hare Intl

$1,224

Air New Zealand

Oct 24

ORD9:38 pmChicago O'Hare Intl

42h 57m

2 stops

SYD8:35 amSydney Kingsford Smith

Nov 9

SYD11:50 amSydney Kingsford Smith

24h 06m

2 stops

ORD6:56 pmChicago O'Hare Intl

$1,232

ANA flights from Illinois to Australia

Our best ANA deals on Illinois to Australia flight tickets

ANA

Sep 27

ORD7:45 pmChicago O'Hare Intl

32h 25m

2 stops

SYD7:10 pmSydney Kingsford Smith

Oct 12

SYD9:45 pmSydney Kingsford Smith

26h 55m

1 stop

ORD8:40 amChicago O'Hare Intl

$1,229

ANA

Sep 27

ORD5:45 pmChicago O'Hare Intl

34h 25m

1 stop

SYD7:10 pmSydney Kingsford Smith

Oct 12

SYD9:45 pmSydney Kingsford Smith

26h 55m

1 stop

ORD8:40 amChicago O'Hare Intl

$1,234

ANA

Sep 27

ORD11:00 amChicago O'Hare Intl

41h 10m

2 stops

SYD7:10 pmSydney Kingsford Smith

Oct 12

SYD9:45 pmSydney Kingsford Smith

26h 55m

1 stop

ORD8:40 amChicago O'Hare Intl

$1,240

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 9/1

4:45 pm-10:40 am

2 stops26h 55m

Sydney Kingsford Smith

Tue 9/8

9:55 am-9:35 pm

2 stops26h 40m

$1,223

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 9/1

3:48 pm-10:40 am

2 stops27h 52m

Sydney Kingsford Smith

Tue 9/8

9:55 am-9:35 pm

2 stops26h 40m

$1,223

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Sun 9/27

5:45 pm-7:10 pm

1 stop34h 25m

Sydney Kingsford Smith

Mon 10/12

9:45 pm-8:40 am

1 stop26h 55m

$1,224

ChicagoMelbourne

ORD Chicago O'Hare Intl - MEL Melbourne

ORDMEL

Chicago O'Hare Intl

Mon 11/2

6:50 pm-5:50 pm

1 stop30h 00m

Melbourne

Wed 11/11

11:40 pm-2:30 pm

1 stop31h 50m

$1,225

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Sun 9/27

7:45 pm-7:10 pm

2 stops32h 25m

Sydney Kingsford Smith

Mon 10/12

9:45 pm-8:40 am

1 stop26h 55m

$1,229

ChicagoMelbourne

ORD Chicago O'Hare Intl - MEL Melbourne

ORDMEL

Chicago O'Hare Intl

Sun 11/8

6:50 pm-11:20 pm

1 stop35h 30m

Melbourne

Wed 11/18

11:40 pm-2:30 pm

1 stop31h 50m

$1,233

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 2/2

11:55 am-2:50 pm

2 stops33h 55m

Sydney Kingsford Smith

Tue 2/9

2:05 pm-4:14 pm

1 stop19h 09m

$1,242

Quickest round-trip

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Tue 10/27

10:22 am-5:00 am

2 stops26h 38m

Melbourne

Wed 11/11

10:45 pm-8:07 am

2 stops26h 22m

$1,244

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Tue 10/27

5:40 am-5:00 am

1 stop31h 20m

Melbourne

Wed 11/11

10:45 pm-8:07 am

2 stops26h 22m

$1,244

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 2/3

5:04 pm-8:50 pm

2 stops34h 46m

Sydney Kingsford Smith

Wed 2/10

11:20 am-11:59 pm

1 stop29h 39m

$1,289

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Illinois to Australia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Australia?

The month of February is, on average, the cheapest month to fly to Australia from Illinois, with most prices found around $1,277. If you aren’t able to travel during the month of February, then book flights to Australia from Illinois during June instead. Flights to Australia in June, while not as cheap as those in February, still average around $1,318.

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

You are more likely to see cheaper flights to Australia from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Australia for around $1,421 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from Illinois for as low as $1,162 on momondo.

Can stopping save me money on Illinois to Australia flights?

You could potentially save up to 18% on your flight if you consider stops on a Illinois to Australia flight.

Cheap Illinois to Australia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Australia

Fastest flight time	20h 24m
Direct flights	None

The fastest flight from Illinois to Australia takes 20h 24m

There are no direct flights from Illinois to Australia. There are no popular flight routes from Illinois to Australia.

Search flight deals

Frequently asked questions about flying from Illinois to Australia

When did momondo last update prices for flights from Illinois to Australia?
Prices for flights from Illinois to Australia refresh daily.
How many operators does momondo search for flights from Illinois to Australia?
As of August 2026, there are 10 operators available to choose from for flights from Illinois to Australia.
How old do you have to be to fly from Illinois to Australia?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Australia.
What documentation or ID do you need to fly to Australia?
The required travel and health documents for your Australia trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Australia. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Illinois to Australia

Compare and see reviews for airlines that fly from Illinois to Australia with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $261	Free Cancellation	Rating 7.8 8,497 reviews	Search Delta flights
Air Canada	PriceFrom $712	Free Cancellation	Rating 7.1 11,455 reviews	Search Air Canada flights
Fiji Airways	PriceFrom $716	Free Cancellation	Rating 8.0 252 reviews	Search Fiji Airways flights
Qantas Airways	PriceFrom $837	Free Cancellation	Rating 7.5 1,079 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $844	Free Cancellation	Rating 7.1 11,892 reviews	Search American Airlines flights
United Airlines	PriceFrom $870	Free Cancellation	Rating 7.4 10,089 reviews	Search United Airlines flights
ANA	PriceFrom $1,209	Free Cancellation	Rating 8.3 1,293 reviews	Search ANA flights
Air New Zealand	PriceFrom $1,264	Free Cancellation	Rating 8.0 659 reviews	Search Air New Zealand flights
Qatar Airways	PriceFrom $1,391	Free Cancellation	Rating 7.4 3,739 reviews	Search Qatar Airways flights
Cathay Pacific	PriceFrom $1,560	Free Cancellation	Rating 7.6 1,441 reviews	Search Cathay Pacific flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Australia?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to Australia for you.

Can I find flights from Illinois to Australia with flexible booking policies on momondo?

Yes. All flights to Australia from Illinois on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Illinois to Australia?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Australia from Illinois.

I’m not ready to book a flight from Illinois to Australia right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Illinois to Australia flights. All you need is a valid email address and we will do the rest; it is that quick and easy.