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

Air Canada, Asiana Airlines, and United Airlines 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 Chicago and flying into Sydney (one of the most popular routes), then the duration is 23h 50m on average. Another popular route from Illinois to Australia is flying from Peoria to Sydney, which will take roughly 25h 10m. Keep in mind that layovers or delays could extend your travel time.

What airlines fly to Australia?

Qantas Airways, United Airlines and American 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 March 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.

$460 Cheap Flights from Illinois to Australia in 2026

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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.

8:30 am - 10:35 am

ORD

BNE

35h 05m

3 stops

11:35 am - 6:07 am

BNE

ORD

33h 32m

2 stops

$951Multiple Airlines

Fri, May 15 - Sun, May 24

3:40 pm - 7:05 am

ORD

BNE

24h 25m

1 stop

10:15 am - 2:45 pm

BNE

ORD

19h 30m

1 stop

$955Air Canada

Sun, May 31 - Tue, Jun 9

3:40 pm - 7:05 am

ORD

BNE

24h 25m

1 stop

10:15 am - 2:45 pm

BNE

ORD

19h 30m

1 stop

$956Air Canada

Tue, May 5 - Tue, May 26

7:30 am - 11:50 am

ORD

SYD

37h 20m

2 stops

1:20 pm - 5:35 am

SYD

ORD

31h 15m

2 stops

$983Multiple Airlines

Wed, May 20 - Wed, Jun 3

6:11 pm - 7:20 pm

STL

MEL

34h 09m

2 stops

7:30 am - 10:59 pm

MEL

STL

30h 29m

2 stops

$1,184Fiji Airways

Sat, May 9 - Sat, May 16

6:11 pm - 11:50 am

STL

SYD

26h 39m

2 stops

1:15 pm - 10:59 pm

SYD

STL

24h 44m

2 stops

$1,208Fiji Airways

Tue, May 12 - Tue, May 19

12:27 pm - 5:00 am

STL

MEL

25h 33m

1 stop

1:35 pm - 7:30 pm

MEL

STL

20h 55m

1 stop

$1,418Qantas Airways

Sat, May 9 - Sat, May 16

6:35 am - 6:45 am

STL

MEL

33h 10m

1 stop

1:35 pm - 6:34 pm

MEL

STL

19h 59m

1 stop

$1,473Qantas Airways

Sat, Jun 27 - Sat, Jul 4

6:00 am - 8:15 am

STL

MEL

35h 15m

2 stops

10:55 am - 6:22 pm

MEL

STL

22h 27m

1 stop

$1,484United Airlines

Tue, Apr 28 - Tue, May 5

7:23 pm - 8:15 am

STL

MEL

21h 52m

1 stop

10:55 am - 3:46 pm

MEL

STL

43h 51m

2 stops

$1,558United Airlines

Sun, Jun 14 - Sun, Jun 21

Qantas Airways flights from Illinois to Australia

Our best Qantas Airways deals on Illinois to Australia flight tickets

Qantas Airways

Jul 1

STL6:35 amLambert-St Louis

42h 00m

2 stops

SYD3:35 pmSydney Kingsford Smith

Jul 8

SYD12:00 pmSydney Kingsford Smith

19h 33m

1 stop

STL4:33 pmLambert-St Louis

$1,386

Qantas Airways

Apr 19

STL6:21 amLambert-St Louis

40h 29m

2 stops

SYD1:50 pmSydney Kingsford Smith

Apr 29

SYD12:00 pmSydney Kingsford Smith

20h 21m

1 stop

STL5:21 pmLambert-St Louis

$1,387

Qantas Airways

May 12

STL6:21 amLambert-St Louis

31h 39m

1 stop

BNE5:00 amBrisbane

May 19

BNE8:45 amBrisbane

23h 36m

2 stops

STL5:21 pmLambert-St Louis

$1,418

Air Canada flights from Illinois to Australia

Our best Air Canada deals on Illinois to Australia flight tickets

Air Canada

May 31

ORD3:40 pmChicago O'Hare Intl

24h 25m

1 stop

BNE7:05 amBrisbane

Jun 9

BNE10:15 amBrisbane

19h 30m

1 stop

ORD2:45 pmChicago O'Hare Intl

$955

Air Canada

May 5

ORD3:40 pmChicago O'Hare Intl

24h 25m

1 stop

BNE7:05 amBrisbane

May 26

BNE10:15 amBrisbane

19h 30m

1 stop

ORD2:45 pmChicago O'Hare Intl

$956

Air Canada

May 31

ORD8:45 amChicago O'Hare Intl

31h 20m

2 stops

BNE7:05 amBrisbane

Jun 9

BNE10:15 amBrisbane

19h 30m

1 stop

ORD2:45 pmChicago O'Hare Intl

$958

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Fri 5/15

8:30 am-10:35 am

3 stops35h 05m

Brisbane

Sun 5/24

11:35 am-6:07 am

2 stops33h 32m

$951

Quickest round-trip

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Sun 5/31

3:40 pm-7:05 am

1 stop24h 25m

Brisbane

Tue 6/9

10:15 am-2:45 pm

1 stop19h 30m

$955

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Tue 5/5

3:40 pm-7:05 am

1 stop24h 25m

Brisbane

Tue 5/26

10:15 am-2:45 pm

1 stop19h 30m

$956

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 5/20

7:30 am-11:50 am

2 stops37h 20m

Sydney Kingsford Smith

Wed 6/3

1:20 pm-5:35 am

2 stops31h 15m

$983

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 5/9

6:11 pm-7:20 pm

2 stops34h 09m

Melbourne

Sat 5/16

7:30 am-10:59 pm

2 stops30h 29m

$1,184

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 5/12

6:11 pm-11:50 am

2 stops26h 39m

Sydney Kingsford Smith

Tue 5/19

1:15 pm-10:59 pm

2 stops24h 44m

$1,208

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 5/9

12:27 pm-5:00 am

1 stop25h 33m

Melbourne

Sat 5/16

1:35 pm-7:30 pm

1 stop20h 55m

$1,418

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 6/27

6:35 am-6:45 am

1 stop33h 10m

Melbourne

Sat 7/4

1:35 pm-6:34 pm

1 stop19h 59m

$1,473

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 4/28

6:00 am-8:15 am

2 stops35h 15m

Melbourne

Tue 5/5

10:55 am-6:22 pm

1 stop22h 27m

$1,484

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sun 6/14

7:23 pm-8:15 am

1 stop21h 52m

Melbourne

Sun 6/21

10:55 am-3:46 pm

2 stops43h 51m

$1,558

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 $1,149. If you aren’t able to travel during the month of February, then book flights to Australia from Illinois during September instead. Flights to Australia in September, while not as cheap as those in February, still average around $1,355.

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 $1,341 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 $1,058 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 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 March 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
American Airlines	PriceFrom $198	Free Cancellation	Rating 7.1 11,541 reviews	Search American Airlines flights
Air Canada	PriceFrom $712	Free Cancellation	Rating 7.1 10,866 reviews	Search Air Canada flights
Fiji Airways	PriceFrom $716	Free Cancellation	Rating 8.1 237 reviews	Search Fiji Airways flights
Qantas Airways	PriceFrom $836	Free Cancellation	Rating 7.5 1,016 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $870	Free Cancellation	Rating 7.4 9,525 reviews	Search United Airlines flights
Delta	PriceFrom $1,034	Free Cancellation	Rating 7.9 8,364 reviews	Search Delta flights
ANA	PriceFrom $1,177	Free Cancellation	Rating 8.4 1,160 reviews	Search ANA flights
Air New Zealand	PriceFrom $1,217	Free Cancellation	Rating 8.0 623 reviews	Search Air New Zealand flights
Qatar Airways	PriceFrom $1,263	Free Cancellation	Rating 7.4 3,729 reviews	Search Qatar Airways flights
Cathay Pacific	PriceFrom $1,470	Free Cancellation	Rating 7.6 1,234 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.