How long is the flight from Illinois to Australia?

The flight from Illinois to Australia depends on which airports you’re departing from and arriving to, and whether or not you have a layover. If you fly from Chicago (a popular airport in Illinois) to Sydney (the most popular airport in Australia), then the flight time is 23h 27m on average. If you fly from Peoria (another popular airport in Illinois) to Sydney, then the average flight time is 25h 05m.

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

Air Canada, Philippine Airlines, and Qantas Airways 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 2 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 offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify 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 travel and health documents required for your trip to Australia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Australia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$784 Cheap Flights from Illinois to Australia in 2025/26

1 adult

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Find the cheapest flights from Illinois to Australia

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

15:10 - 09:00

ORD

SYD

24h 50m1 stop

07:05 - 16:38

SYD

ORD

26h 33m2 stops

$1,285Qantas Airways

Wed, 11 Feb - Wed, 4 Mar

14:15 - 09:00

ORD

SYD

25h 45m1 stop

19:15 - 16:38

SYD

ORD

38h 23m2 stops

$1,318Qantas Airways

Mon, 9 Feb - Mon, 2 Mar

08:42 - 07:05

ORD

BNE

31h 23m2 stops

10:00 - 14:43

BNE

ORD

19h 43m1 stop

$1,427Air Canada

Tue, 7 Apr - Tue, 14 Apr

15:35 - 08:45

ORD

BNE

25h 10m1 stop

10:45 - 14:41

BNE

ORD

19h 56m1 stop

$1,431Air Canada

Mon, 9 Feb - Mon, 16 Feb

13:15 - 05:00

ORD

MEL

22h 45m1 stop

16:05 - 19:40

MEL

ORD

20h 35m1 stop

$1,689Multiple Airlines

Mon, 16 Feb - Mon, 2 Mar

13:29 - 08:20

MDW

BNE

26h 51m2 stops

11:05 - 17:55

BNE

MDW

22h 50m2 stops

$1,732Delta

Wed, 21 Jan - Wed, 28 Jan

12:48 - 08:20

MDW

BNE

27h 32m2 stops

10:40 - 22:22

BNE

MDW

27h 42m2 stops

$1,734Delta

Wed, 28 Jan - Sun, 8 Feb

07:30 - 09:00

MDW

SYD

32h 30m2 stops

11:20 - 23:44

SYD

MDW

29h 24m2 stops

$1,811Multiple Airlines

Sun, 1 Feb - Mon, 16 Feb

19:05 - 09:15

STL

MEL

22h 10m1 stop

10:55 - 18:24

MEL

STL

22h 29m1 stop

$1,917United Airlines

Fri, 3 Apr - Sun, 19 Apr

17:00 - 10:00

STL

MEL

24h 00m1 stop

11:30 - 20:26

MEL

STL

25h 56m2 stops

$1,923United Airlines

Fri, 6 Feb - Sun, 22 Feb

Qantas Airways flights from Illinois to Australia

Our best Qantas Airways deals on Illinois to Australia flight tickets

Qantas Airways

11 Feb

ORD15:10Chicago O'Hare Intl

24h 50m

1 stop

SYD09:00Sydney Kingsford Smith

4 Mar

SYD07:05Sydney Kingsford Smith

26h 33m

2 stops

ORD16:38Chicago O'Hare Intl

$1,285

Find similar

Qantas Airways

9 Feb

ORD14:15Chicago O'Hare Intl

25h 45m

1 stop

SYD09:00Sydney Kingsford Smith

2 Mar

SYD19:15Sydney Kingsford Smith

38h 23m

2 stops

ORD16:38Chicago O'Hare Intl

$1,318

Find similar

Qantas Airways

25 Jan

ORD18:40Chicago O'Hare Intl

21h 20m

1 stop

SYD09:00Sydney Kingsford Smith

7 Feb

SYD07:05Sydney Kingsford Smith

25h 52m

2 stops

ORD15:57Chicago O'Hare Intl

$1,342

Find similar

Delta flights from Illinois to Australia

Our best Delta deals on Illinois to Australia flight tickets

Delta

28 Jan

MDW12:48Chicago Midway

27h 32m

2 stops

BNE08:20Brisbane

8 Feb

BNE10:40Brisbane

27h 42m

2 stops

MDW22:22Chicago Midway

$1,734

Find similar

Delta

28 Jan

MDW13:26Chicago Midway

26h 54m

2 stops

BNE08:20Brisbane

8 Feb

BNE10:40Brisbane

27h 42m

2 stops

MDW22:22Chicago Midway

$1,735

Find similar

Delta

23 Jan

MDW10:48Chicago Midway

29h 32m

2 stops

BNE08:20Brisbane

1 Feb

BNE10:40Brisbane

23h 56m

2 stops

MDW18:36Chicago Midway

$1,810

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 11/2

15:10-09:00

1 stop24h 50m

Sydney Kingsford Smith

Wed 4/3

07:05-16:38

2 stops26h 33m

$1,285

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 9/2

14:15-09:00

1 stop25h 45m

Sydney Kingsford Smith

Mon 2/3

19:15-16:38

2 stops38h 23m

$1,318

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Tue 7/4

08:42-07:05

2 stops31h 23m

Brisbane

Tue 14/4

10:00-14:43

1 stop19h 43m

$1,427

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Mon 9/2

15:35-08:45

1 stop25h 10m

Brisbane

Mon 16/2

10:45-14:41

1 stop19h 56m

$1,431

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Mon 16/2

13:15-05:00

1 stop22h 45m

Melbourne

Mon 2/3

16:05-19:40

1 stop20h 35m

$1,689

ChicagoBrisbane

MDW - BNE

MDWBNE

Chicago Midway

Wed 21/1

13:29-08:20

2 stops26h 51m

Brisbane

Wed 28/1

11:05-17:55

2 stops22h 50m

$1,732

ChicagoBrisbane

MDW - BNE

MDWBNE

Chicago Midway

Wed 28/1

12:48-08:20

2 stops27h 32m

Brisbane

Sun 8/2

10:40-22:22

2 stops27h 42m

$1,734

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Sun 1/2

07:30-09:00

2 stops32h 30m

Sydney Kingsford Smith

Mon 16/2

11:20-23:44

2 stops29h 24m

$1,811

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 3/4

19:05-09:15

1 stop22h 10m

Melbourne

Sun 19/4

10:55-18:24

1 stop22h 29m

$1,917

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 6/2

17:00-10:00

1 stop24h 00m

Melbourne

Sun 22/2

11:30-20:26

2 stops25h 56m

$1,923

Flights are sorted by cheapest return 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?

In general, August is the cheapest month to fly from Illinois to Australia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,272. If you don’t want to visit Australia in August, then you should wait until June to fly from Illinois, when ticket prices are also cheap, with an average price of $1,287.

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

On average, the least expensive day to fly to Australia from Illinois is on a Friday. momondo users have found tickets for Friday departures for as low as $1,372. However, this price may fluctuate depending on the airline, the season, and holidays. Flights from Illinois to Australia on a Thursday will generally be more expensive and average around $3,666. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

According to our data, the cheapest time of day to fly to Australia is in the afternoon. momondo users have found flights departing from Illinois to Australia in the afternoon for as low as $1,758. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Australia are more costly in the evening, with an average ticket price of $2,417. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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 $1,601 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from Illinois for as low as $1,269 on momondo.

Can stopping save me money on Illinois to Australia flights?

You could potentially save up to 37% 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 30m
Direct flights	None

The fastest flight from Illinois to Australia takes 20h 30m

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 2 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 offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify 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 travel and health documents required for your trip to Australia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Australia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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 $1,303	Free cancellation	Rating 7.5 953 reviews		Search Qantas Airways flights

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Illinois to Australia . Millions of users trust and use momondo every year so you are in good hands.

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

Flights from Illinois to Australia with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo provides multiple filters to help you find the best flight to Australia from Illinois. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are simply researching potential flights to Australia, momondo offers a useful price alert feature which will track prices for flights to Australia from Illinois and alert you when they change.