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

Fiji Airways is the most popular carrier operating from Illinois to Australia

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 48% of people opting to fly with this airline when traveling to Australia. Keep in mind that there are 9 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 23h 04m on average. Another popular route from Illinois to Australia is flying from Peoria to Sydney, which will take roughly 24h 05m. 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 July 2025, there are 9 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.

$406 Cheap Flights from Illinois to Australia in 2025

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Find the cheapest flights from Illinois to Australia

Round-trip

One-way

Last minute

Cheap round-trip flights

3:40 pm - 7:20 amORD-SYD

24h 40m1 stop

9:20 am - 3:00 pmSYD-ORD

20h 40m1 stop

$800Air Canada

Find Deal

Sun, Aug 24 - Tue, Sep 9

7:15 am - 8:35 amORD-SYD

33h 20m2 stops

11:20 am - 8:00 amSYD-ORD

37h 40m2 stops

$836Air Canada

Find Deal

Wed, Oct 29 - Wed, Nov 12

6:20 am - 12:45 pmORD-SYD

38h 25m2 stops

2:00 pm - 11:59 pmSYD-ORD

25h 59m2 stops

$964

Find Deal

Mon, Oct 20 - Sun, Nov 2

1:35 pm - 8:35 amSTL-SYD

27h 00m2 stops

11:20 am - 3:29 pmSYD-STL

45h 09m2 stops

$969

Find Deal

Wed, Oct 29 - Sat, Nov 15

7:00 am - 10:25 pmSTL-SYD

46h 25m2 stops

2:20 pm - 4:40 pmSYD-STL

19h 20m1 stop

$1,071Qantas Airways

Find Deal

Wed, Nov 5 - Sun, Nov 23

1:20 pm - 6:55 amSTL-SYD

24h 35m1 stop

7:20 am - 11:44 amSYD-STL

21h 24m2 stops

$1,084Qantas Airways

Find Deal

Mon, Dec 1 - Sun, Feb 1

2:01 pm - 7:05 amSTL-SYD

26h 04m2 stops

9:10 am - 4:10 pmSYD-STL

22h 00m2 stops

$1,156American Airlines

Find Deal

Fri, Sep 12 - Fri, Sep 19

7:59 pm - 6:55 amSTL-SYD

19h 56m1 stop

12:10 pm - 4:10 pmSYD-STL

19h 00m1 stop

$1,157American Airlines

Find Deal

Fri, Sep 12 - Fri, Sep 19

11:55 pm - 9:55 amORD-BNE

42h 00m2 stops

6:05 pm - 8:25 pmBNE-ORD

42h 20m2 stops

$1,245Air New Zealand

Find Deal

Sat, Nov 29 - Sun, Dec 7

4:10 pm - 11:00 amORD-BNE

27h 50m2 stops

12:15 pm - 12:29 amBNE-ORD

27h 14m2 stops

$1,248Air New Zealand

Find Deal

Wed, Sep 10 - Mon, Sep 22

Air Canada flights from Illinois to Australia

Our best Air Canada deals on Illinois to Australia flight tickets

Air Canada

Aug 24

ORD3:40 pmChicago O'Hare Intl

24h 40m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 9

SYD9:20 amSydney Kingsford Smith

20h 40m

1 stop

ORD3:00 pmChicago O'Hare Intl

$800

Find similar

Air Canada

Aug 4

ORD3:40 pmChicago O'Hare Intl

24h 40m

1 stop

SYD7:20 amSydney Kingsford Smith

Aug 19

SYD9:20 amSydney Kingsford Smith

25h 44m

1 stop

ORD8:04 pmChicago O'Hare Intl

$802

Find similar

Air Canada

Oct 29

ORD7:15 amChicago O'Hare Intl

33h 20m

2 stops

SYD8:35 amSydney Kingsford Smith

Nov 12

SYD11:20 amSydney Kingsford Smith

37h 40m

2 stops

ORD8:00 amChicago O'Hare Intl

$836

Find similar

Qantas Airways flights from Illinois to Australia

Our best Qantas Airways deals on Illinois to Australia flight tickets

Qantas Airways

Nov 5

STL7:00 amLambert-St Louis

46h 25m

2 stops

SYD10:25 pmSydney Kingsford Smith

Nov 23

SYD2:20 pmSydney Kingsford Smith

19h 20m

1 stop

STL4:40 pmLambert-St Louis

$1,071

Find similar

Qantas Airways

Dec 1

STL1:20 pmLambert-St Louis

24h 35m

1 stop

SYD6:55 amSydney Kingsford Smith

Feb 1

SYD7:20 amSydney Kingsford Smith

21h 24m

2 stops

STL11:44 amLambert-St Louis

$1,084

Find similar

Qantas Airways

Nov 28

STL6:15 amLambert-St Louis

35h 40m

2 stops

SYD10:55 amSydney Kingsford Smith

Dec 14

SYD2:20 pmSydney Kingsford Smith

20h 55m

1 stop

STL6:15 pmLambert-St Louis

$1,115

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 8/24

3:40 pm-7:20 am

1 stop24h 40m

Sydney Kingsford Smith

Tue 9/9

9:20 am-3:00 pm

1 stop20h 40m

$800

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 10/29

7:15 am-8:35 am

2 stops33h 20m

Sydney Kingsford Smith

Wed 11/12

11:20 am-8:00 am

2 stops37h 40m

$836

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 10/20

6:20 am-12:45 pm

2 stops38h 25m

Sydney Kingsford Smith

Sun 11/2

2:00 pm-11:59 pm

2 stops25h 59m

$964

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 10/29

1:35 pm-8:35 am

2 stops27h 00m

Sydney Kingsford Smith

Sat 11/15

11:20 am-3:29 pm

2 stops45h 09m

$969

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/5

7:00 am-10:25 pm

2 stops46h 25m

Sydney Kingsford Smith

Sun 11/23

2:20 pm-4:40 pm

1 stop19h 20m

$1,071

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 12/1

1:20 pm-6:55 am

1 stop24h 35m

Sydney Kingsford Smith

Sun 2/1

7:20 am-11:44 am

2 stops21h 24m

$1,084

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 9/12

2:01 pm-7:05 am

2 stops26h 04m

Sydney Kingsford Smith

Fri 9/19

9:10 am-4:10 pm

2 stops22h 00m

$1,156

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 9/12

7:59 pm-6:55 am

1 stop19h 56m

Sydney Kingsford Smith

Fri 9/19

12:10 pm-4:10 pm

1 stop19h 00m

$1,157

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Sat 11/29

11:55 pm-9:55 am

2 stops42h 00m

Brisbane

Sun 12/7

6:05 pm-8:25 pm

2 stops42h 20m

$1,245

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Wed 9/10

4:10 pm-11:00 am

2 stops27h 50m

Brisbane

Mon 9/22

12:15 pm-12:29 am

2 stops27h 14m

$1,248

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 $857. If you aren’t able to travel during the month of August, then book flights to Australia from Illinois during May instead. Flights to Australia in May, while not as cheap as those in August, still average around $867.

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 $1,102 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 $911 on momondo.

Can stopping save me money on Illinois to Australia flights?

You could potentially save up to 25% 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

Best Price Found	$406
Fastest flight time	19h 56m
Direct flights	None
Airports in Australia	5 airports

The best one-way flight to Australia from Illinois in the past 72 hours is $406. The best round-trip flight deal from Illinois to Australia found on momondo in the last 72 hours is $800.

The fastest flight from Illinois to Australia takes 19h 56m

There are no direct flights from Illinois to Australia. Popular non-direct routes for this connection are Chicago O'Hare Intl Airport - Sydney Kingsford Smith Airport, Chicago O'Hare Intl Airport - Perth Airport and Chicago O'Hare Intl Airport - Brisbane Airport.

There are 5 airports near Australia: Melbourne Avalon (AVV), Melbourne (MEL), Brisbane (BNE), Perth (PER), Sydney Kingsford Smith (SYD)

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 July 2025, there are 9 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 $647	Free Cancellation	Rating 7.5 887 reviews	Search Qantas Airways flights
ANA	PriceFrom $679	Free Cancellation	Rating 8.4 922 reviews	Search ANA flights
American Airlines	PriceFrom $679	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Fiji Airways	PriceFrom $772	Free Cancellation	Rating 8.0 202 reviews	Search Fiji Airways flights
Delta	PriceFrom $851	Free Cancellation	Rating 8.0 7,981 reviews	Search Delta flights
United Airlines	PriceFrom $876	Free Cancellation	Rating 7.4 8,900 reviews	Search United Airlines flights
Air Canada	PriceFrom $953	Free Cancellation	Rating 7.1 9,851 reviews	Search Air Canada flights
Air New Zealand	PriceFrom $1,275	Free Cancellation	Rating 7.9 501 reviews	Search Air New Zealand flights
Cathay Pacific	PriceFrom $1,470	Free Cancellation	Rating 7.6 949 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.