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

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

What airlines fly to Australia?

Qantas Airways, American Airlines 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.

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 24h 07m on average. Another popular route from Illinois to Australia is flying from Peoria to Sydney, which will take roughly 25h 25m. Keep in mind that layovers or delays could extend your travel time.

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 February 2026, there are 8 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.

$435 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.

4:13 pm - 8:50 pm

STL

SYD

35h 37m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$898Qantas Airways

Tue, Mar 3 - Tue, Mar 10

7:45 pm - 6:45 am

ORD

MEL

44h 00m

1 stop

1:25 pm - 5:50 am

MEL

ORD

31h 25m

2 stops

$912Multiple Airlines

Wed, Apr 8 - Wed, Apr 29

3:40 pm - 7:05 am

ORD

BNE

24h 25m

1 stop

10:00 am - 2:45 pm

BNE

ORD

19h 45m

1 stop

$963Air Canada

Wed, May 20 - Sun, May 31

3:40 pm - 7:05 am

ORD

BNE

24h 25m

1 stop

10:00 am - 2:43 pm

BNE

ORD

19h 43m

1 stop

$964Air Canada

Wed, Apr 15 - Sun, Apr 19

4:13 pm - 5:00 am

STL

MEL

20h 47m

1 stop

12:00 pm - 11:58 pm

MEL

STL

27h 58m

1 stop

$1,270American Airlines

Mon, Mar 9 - Fri, Mar 20

4:13 pm - 9:30 am

STL

MEL

25h 17m

2 stops

12:00 pm - 11:58 pm

MEL

STL

27h 58m

1 stop

$1,273American Airlines

Thu, Mar 12 - Sat, Mar 21

5:29 pm - 10:00 am

STL

MEL

23h 31m

1 stop

1:00 pm - 4:44 pm

MEL

STL

20h 44m

1 stop

$1,292United Airlines

Sat, Feb 21 - Wed, Feb 25

5:29 pm - 10:00 am

STL

MEL

23h 31m

1 stop

1:00 pm - 4:44 pm

MEL

STL

20h 44m

1 stop

$1,293United Airlines

Sat, Feb 21 - Wed, Feb 25

12:47 pm - 7:00 am

MDW

MEL

26h 13m

2 stops

9:10 am - 5:54 pm

MEL

MDW

24h 44m

2 stops

$1,387Delta

Wed, Mar 11 - Sun, Mar 22

12:45 pm - 8:30 am

MDW

SYD

26h 45m

2 stops

9:15 am - 6:36 pm

SYD

MDW

24h 21m

2 stops

$1,387Delta

Wed, Mar 4 - Wed, Apr 15

American Airlines flights from Illinois to Australia

Our best American Airlines deals on Illinois to Australia flight tickets

American Airlines

Feb 18

ORD3:45 pmChicago O'Hare Intl

22h 45m

1 stop

BNE6:30 amBrisbane

Feb 25

BNE9:40 amBrisbane

19h 24m

1 stop

ORD1:04 pmChicago O'Hare Intl

$1,155

American Airlines

Feb 18

ORD3:22 pmChicago O'Hare Intl

23h 08m

2 stops

BNE6:30 amBrisbane

Feb 25

BNE9:40 amBrisbane

20h 39m

2 stops

ORD2:19 pmChicago O'Hare Intl

$1,160

American Airlines

Feb 25

STL7:00 amLambert-St Louis

30h 55m

1 stop

SYD6:55 amSydney Kingsford Smith

Mar 2

SYD2:05 pmSydney Kingsford Smith

20h 08m

1 stop

STL5:13 pmLambert-St Louis

$1,264

Qantas Airways flights from Illinois to Australia

Our best Qantas Airways deals on Illinois to Australia flight tickets

Qantas Airways

Mar 3

STL4:13 pmLambert-St Louis

35h 37m

2 stops

SYD8:50 pmSydney Kingsford Smith

Mar 10

SYD11:20 amSydney Kingsford Smith

28h 38m

1 stop

STL11:58 pmLambert-St Louis

$898

Qantas Airways

Feb 12

STL6:38 amLambert-St Louis

33h 22m

1 stop

SYD9:00 amSydney Kingsford Smith

Feb 14

SYD5:50 pmSydney Kingsford Smith

47h 09m

2 stops

STL11:59 pmLambert-St Louis

$911

Qantas Airways

Mar 25

STL6:50 pmLambert-St Louis

35h 55m

2 stops

MEL10:45 pmMelbourne

Apr 1

MEL9:45 amMelbourne

30h 13m

1 stop

STL11:58 pmLambert-St Louis

$922

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 3/3

4:13 pm-8:50 pm

2 stops35h 37m

Sydney Kingsford Smith

Tue 3/10

11:20 am-11:58 pm

1 stop28h 38m

$898

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Wed 4/8

7:45 pm-6:45 am

1 stop44h 00m

Melbourne

Wed 4/29

1:25 pm-5:50 am

2 stops31h 25m

$912

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Wed 5/20

3:40 pm-7:05 am

1 stop24h 25m

Brisbane

Sun 5/31

10:00 am-2:45 pm

1 stop19h 45m

$963

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Wed 4/15

3:40 pm-7:05 am

1 stop24h 25m

Brisbane

Sun 4/19

10:00 am-2:43 pm

1 stop19h 43m

$964

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 3/9

4:13 pm-5:00 am

1 stop20h 47m

Melbourne

Fri 3/20

12:00 pm-11:58 pm

1 stop27h 58m

$1,270

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 3/12

4:13 pm-9:30 am

2 stops25h 17m

Melbourne

Sat 3/21

12:00 pm-11:58 pm

1 stop27h 58m

$1,273

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 2/21

5:29 pm-10:00 am

1 stop23h 31m

Melbourne

Wed 2/25

1:00 pm-4:44 pm

1 stop20h 44m

$1,292

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 2/21

5:29 pm-10:00 am

1 stop23h 31m

Melbourne

Wed 2/25

1:00 pm-4:44 pm

1 stop20h 44m

$1,293

ChicagoMelbourne

MDW - MEL

MDWMEL

Chicago Midway

Wed 3/11

12:47 pm-7:00 am

2 stops26h 13m

Melbourne

Sun 3/22

9:10 am-5:54 pm

2 stops24h 44m

$1,387

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Wed 3/4

12:45 pm-8:30 am

2 stops26h 45m

Sydney Kingsford Smith

Wed 4/15

9:15 am-6:36 pm

2 stops24h 21m

$1,387

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 October is, on average, the cheapest month to fly to Australia from Illinois, with most prices found around $966. If you aren’t able to travel during the month of October, then book flights to Australia from Illinois during February instead. Flights to Australia in February, while not as cheap as those in October, still average around $1,097.

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 $1,265 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 $1,052 on momondo.

Can stopping save me money on Illinois to Australia flights?

You could potentially save up to 23% 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	19h 40m
Direct flights	None

The fastest flight from Illinois to Australia takes 19h 40m

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 February 2026, there are 8 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 7.5 988 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $698	Free Cancellation	Rating 7.2 11,266 reviews	Search American Airlines flights
Fiji Airways	PriceFrom $795	Free Cancellation	Rating 8.0 225 reviews	Search Fiji Airways flights
United Airlines	PriceFrom $870	Free Cancellation	Rating 7.4 9,274 reviews	Search United Airlines flights
Air Canada	PriceFrom $872	Free Cancellation	Rating 7.1 10,708 reviews	Search Air Canada flights
Delta	PriceFrom $935	Free Cancellation	Rating 7.9 8,175 reviews	Search Delta flights
ANA	PriceFrom $1,177	Free Cancellation	Rating 8.4 1,090 reviews	Search ANA flights
Air New Zealand	PriceFrom $1,217	Free Cancellation	Rating 8.0 582 reviews	Search Air New Zealand flights
Qatar Airways	PriceFrom $1,229	Free Cancellation	Rating 7.4 3,731 reviews	Search Qatar Airways flights
Cathay Pacific	PriceFrom $1,470	Free Cancellation	Rating 7.6 1,161 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.

An easier way to manage your Australia trip

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Popular cities in Australia

Flights to Sydneyfrom $669

Flights to Melbournefrom $699

Flights to Brisbanefrom $664

Flights to Perthfrom $983

Flights to Adelaidefrom $757

Flights to Cairnsfrom $833

Flights to Coolangattafrom $879

Flights to Hobartfrom $931

Flights to Darwinfrom $1,155

Flights to Canberrafrom $936

Flights to Maroochydorefrom $1,121

Flights to Launcestonfrom $1,213

Cheap flights from Illinois to Australia from $435

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Australia departing on 4/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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American Airlines flights from Illinois to Australia

Our best American Airlines deals on Illinois to Australia flight tickets

Qantas Airways flights from Illinois to Australia

Our best Qantas Airways deals on Illinois to Australia flight tickets

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How to get the cheapest flight ticket from Illinois to Australia

What is the cheapest month to fly to Australia?

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

Can stopping save me money on Illinois to Australia flights?

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

What airlines fly to Australia?

How long is the flight from Illinois to Australia?

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

Direct flights

Best airlines flying from Illinois to Australia

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

Why use momondo?

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

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

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

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

An easier way to manage your Australia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Australia

Popular cities in Australia

Popular flights according to clicks in the last 7 days on momondo

Illinois flight routes

According to popular flight searches on momondo this year

Australia flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Australia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Australia

List of cabin classes available on flights landing in Australia. Availability may vary depending on flight origin and airline.

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According to popular flight searches on momondo this year