What airlines fly to Australia?

American Airlines, Qantas Airways and United Airlines are the top three most popular airlines that fly to Australia from Illinois according to our data. American Airlines is the first choice among our users, with 39% 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.

How long is the flight from Illinois to Australia?

Flight times from Illinois to Australia vary, but if you’re flying out of Chicago and flying into Sydney (one of the most popular routes), then the duration is 22h 51m on average. Another popular route from Illinois to Australia is flying from Peoria to Sydney, which will take roughly 26h 55m. Keep in mind that layovers or delays could extend your travel time.

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

Air Canada, Qantas Airways, and United Airlines are the most popular carriers operating 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 December 2025, 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.

$530 Cheap Flights from Illinois to Australia in 2025/26

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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.

8:50 am - 9:00 am

ORD

SYD

31h 10m1 stop

7:05 am - 4:38 pm

SYD

ORD

26h 33m2 stops

$860Qantas Airways

Wed, Feb 11 - Wed, Mar 4

3:10 pm - 9:00 am

ORD

SYD

24h 50m1 stop

7:05 am - 4:38 pm

SYD

ORD

26h 33m2 stops

$862Qantas Airways

Wed, Feb 11 - Wed, Mar 4

8:45 am - 8:45 am

ORD

BNE

32h 00m2 stops

10:45 am - 5:08 pm

BNE

ORD

46h 23m2 stops

$956Air Canada

Tue, Jan 20 - Tue, Jan 27

8:51 am - 7:05 am

ORD

BNE

31h 14m1 stop

10:00 am - 5:01 pm

BNE

ORD

46h 01m2 stops

$957Air Canada

Tue, Apr 7 - Tue, Apr 14

1:15 pm - 5:00 am

ORD

MEL

22h 45m1 stop

4:05 pm - 7:40 pm

MEL

ORD

20h 35m1 stop

$1,133Multiple Airlines

Mon, Feb 16 - Mon, Mar 2

1:29 pm - 8:20 am

MDW

BNE

26h 51m2 stops

11:05 am - 5:55 pm

BNE

MDW

22h 50m2 stops

$1,162Delta

Wed, Jan 21 - Wed, Jan 28

12:48 pm - 8:20 am

MDW

BNE

27h 32m2 stops

10:40 am - 10:22 pm

BNE

MDW

27h 42m2 stops

$1,163Delta

Wed, Jan 28 - Sun, Feb 8

5:04 pm - 6:45 pm

STL

MEL

32h 41m2 stops

7:00 am - 7:29 pm

MEL

STL

29h 29m2 stops

$1,223Multiple Airlines

Thu, Jan 22 - Thu, Jan 29

7:05 pm - 9:15 am

STL

MEL

22h 10m1 stop

10:55 am - 6:24 pm

MEL

STL

22h 29m1 stop

$1,286United Airlines

Fri, Apr 3 - Sun, Apr 19

7:05 pm - 9:15 am

STL

MEL

22h 10m1 stop

10:55 am - 6:24 pm

MEL

STL

22h 29m1 stop

$1,287United Airlines

Fri, Apr 3 - Sun, Apr 19

Qantas Airways flights from Illinois to Australia

Our best Qantas Airways deals on Illinois to Australia flight tickets

Qantas Airways

Feb 11

ORD8:50 amChicago O'Hare Intl

31h 10m

1 stop

SYD9:00 amSydney Kingsford Smith

Mar 4

SYD7:05 amSydney Kingsford Smith

26h 33m

2 stops

ORD4:38 pmChicago O'Hare Intl

$860

Find similar

Qantas Airways

Feb 11

ORD3:10 pmChicago O'Hare Intl

24h 50m

1 stop

SYD9:00 amSydney Kingsford Smith

Mar 4

SYD7:05 amSydney Kingsford Smith

26h 33m

2 stops

ORD4:38 pmChicago O'Hare Intl

$862

Find similar

Qantas Airways

Feb 9

ORD2:15 pmChicago O'Hare Intl

25h 45m

1 stop

SYD9:00 amSydney Kingsford Smith

Mar 2

SYD7:15 pmSydney Kingsford Smith

38h 23m

2 stops

ORD4:38 pmChicago O'Hare Intl

$884

Find similar

Cathay Pacific flights from Illinois to Australia

Our best Cathay Pacific deals on Illinois to Australia flight tickets

Cathay Pacific

Jan 22

STL11:05 amLambert-St Louis

40h 50m

3 stops

SYD8:55 pmSydney Kingsford Smith

Jan 29

SYD8:45 amSydney Kingsford Smith

31h 14m

2 stops

STL10:59 pmLambert-St Louis

$1,747

Find similar

Cathay Pacific

Mar 15

STL6:38 amLambert-St Louis

43h 22m

3 stops

SYD6:00 pmSydney Kingsford Smith

Mar 24

SYD10:20 pmSydney Kingsford Smith

35h 43m

2 stops

STL6:03 pmLambert-St Louis

$1,785

Find similar

Cathay Pacific

Mar 15

STL10:07 amLambert-St Louis

39h 53m

3 stops

SYD6:00 pmSydney Kingsford Smith

Mar 24

SYD10:20 pmSydney Kingsford Smith

35h 43m

2 stops

STL6:03 pmLambert-St Louis

$1,786

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 2/11

8:50 am-9:00 am

1 stop31h 10m

Sydney Kingsford Smith

Wed 3/4

7:05 am-4:38 pm

2 stops26h 33m

$860

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 2/11

3:10 pm-9:00 am

1 stop24h 50m

Sydney Kingsford Smith

Wed 3/4

7:05 am-4:38 pm

2 stops26h 33m

$862

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Tue 1/20

8:45 am-8:45 am

2 stops32h 00m

Brisbane

Tue 1/27

10:45 am-5:08 pm

2 stops46h 23m

$956

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Tue 4/7

8:51 am-7:05 am

1 stop31h 14m

Brisbane

Tue 4/14

10:00 am-5:01 pm

2 stops46h 01m

$957

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Mon 2/16

1:15 pm-5:00 am

1 stop22h 45m

Melbourne

Mon 3/2

4:05 pm-7:40 pm

1 stop20h 35m

$1,133

ChicagoBrisbane

MDW - BNE

MDWBNE

Chicago Midway

Wed 1/21

1:29 pm-8:20 am

2 stops26h 51m

Brisbane

Wed 1/28

11:05 am-5:55 pm

2 stops22h 50m

$1,162

ChicagoBrisbane

MDW - BNE

MDWBNE

Chicago Midway

Wed 1/28

12:48 pm-8:20 am

2 stops27h 32m

Brisbane

Sun 2/8

10:40 am-10:22 pm

2 stops27h 42m

$1,163

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 1/22

5:04 pm-6:45 pm

2 stops32h 41m

Melbourne

Thu 1/29

7:00 am-7:29 pm

2 stops29h 29m

$1,223

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 4/3

7:05 pm-9:15 am

1 stop22h 10m

Melbourne

Sun 4/19

10:55 am-6:24 pm

1 stop22h 29m

$1,286

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 4/3

7:05 pm-9:15 am

1 stop22h 10m

Melbourne

Sun 4/19

10:55 am-6:24 pm

1 stop22h 29m

$1,287

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 August is, on average, the cheapest month to fly to Australia from Illinois, with most prices found around $853. If you aren’t able to travel during the month of August, then book flights to Australia from Illinois during June instead. Flights to Australia in June, while not as cheap as those in August, still average around $863.

What is the cheapest day to depart on your flight to Australia?

The cheapest day to depart from Illinois to Australia is on a Saturday. Travelers who choose to depart for Australia on a Saturday will often find tickets for as low as $935. On the other hand, Thursday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,415.

What is the cheapest time of day to depart on your flight to Australia?

Flying to Australia from Illinois in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $1,185 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $1,417 on average. Flights to Australia from Illinois in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight 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 $1,074 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 $851 on momondo.

Can stopping save me money on Illinois to Australia flights?

You could potentially save up to 26% 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 49m
Direct flights	None

The fastest flight from Illinois to Australia takes 20h 49m

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

Search flight deals

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 December 2025, 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
Qantas Airways	PriceFrom $675	Free Cancellation	Rating 7.5 953 reviews	Search Qantas Airways flights
ANA	PriceFrom $679	Free Cancellation	Rating 8.4 1,045 reviews	Search ANA flights
American Airlines	PriceFrom $796	Free Cancellation	Rating 7.2 11,064 reviews	Search American Airlines flights
Fiji Airways	PriceFrom $796	Free Cancellation	Rating 8.0 211 reviews	Search Fiji Airways flights
Air Canada	PriceFrom $851	Free Cancellation	Rating 7.1 10,562 reviews	Search Air Canada flights
United Airlines	PriceFrom $870	Free Cancellation	Rating 7.4 9,115 reviews	Search United Airlines flights
Delta	PriceFrom $935	Free Cancellation	Rating 7.9 8,014 reviews	Search Delta flights
Qatar Airways	PriceFrom $1,229	Free Cancellation	Rating 7.4 3,692 reviews	Search Qatar Airways flights
Air New Zealand	PriceFrom $1,264	Free Cancellation	Rating 8.0 560 reviews	Search Air New Zealand flights
Cathay Pacific	PriceFrom $1,418	Free Cancellation	Rating 7.6 1,105 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.