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 24h 04m on average. If you fly from Peoria (another popular airport in Illinois) to Sydney, then the average flight time is 24h 05m.

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

American Airlines and Fiji 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 August 2025, there are 3 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.

$734 Cheap Flights from Illinois to Australia in 2025

1 adult

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Find the cheapest flights from Illinois to Australia

Round-trip

One-way

Last minute

Cheap return flights

10:40 - 07:20ORD-SYD

29h 40m2 stops

09:20 - 15:00SYD-ORD

20h 40m1 stop

$1,288Air Canada

Find Deal

Tue, 19 Aug - Wed, 24 Sep

08:45 - 09:35ORD-SYD

31h 50m2 stops

11:20 - 08:05SYD-ORD

37h 45m2 stops

$1,294Air Canada

Find Deal

Tue, 18 Nov - Tue, 24 Feb

06:20 - 10:25ORD-BNE

37h 05m2 stops

11:35 - 22:59BNE-ORD

26h 24m2 stops

$1,470

Find Deal

Sat, 18 Oct - Fri, 31 Oct

06:20 - 12:45ORD-SYD

38h 25m2 stops

14:00 - 23:59SYD-ORD

25h 59m2 stops

$1,486

Find Deal

Mon, 20 Oct - Sun, 2 Nov

17:57 - 10:55STL-SYD

23h 58m2 stops

14:20 - 16:07SYD-STL

18h 47m1 stop

$1,671Qantas Airways

Find Deal

Fri, 28 Nov - Sun, 14 Dec

13:20 - 06:55STL-SYD

24h 35m1 stop

06:00 - 16:40SYD-STL

27h 40m2 stops

$1,683Qantas Airways

Find Deal

Wed, 5 Nov - Sun, 23 Nov

16:25 - 10:30ORD-SYD

25h 05m1 stop

21:45 - 07:20SYD-ORD

26h 35m1 stop

$1,776ANA

Find Deal

Mon, 24 Nov - Sun, 7 Dec

18:00 - 20:15ORD-SYD

33h 15m2 stops

21:45 - 07:20SYD-ORD

26h 35m1 stop

$1,784ANA

Find Deal

Mon, 24 Nov - Sun, 7 Dec

08:48 - 10:55ORD-MEL

33h 07m2 stops

12:10 - 21:16MEL-ORD

26h 06m2 stops

$1,903Air New Zealand

Find Deal

Tue, 25 Nov - Sun, 14 Dec

16:40 - 10:50ORD-MEL

26h 10m2 stops

12:10 - 19:56MEL-ORD

24h 46m2 stops

$1,944Air New Zealand

Find Deal

Wed, 22 Oct - Wed, 12 Nov

Air Canada flights from Illinois to Australia

Our best Air Canada deals on Illinois to Australia flight tickets

Air Canada

19 Aug

ORD10:40Chicago O'Hare Intl

29h 40m

2 stops

SYD07:20Sydney Kingsford Smith

24 Sept

SYD09:20Sydney Kingsford Smith

20h 40m

1 stop

ORD15:00Chicago O'Hare Intl

$1,288

Find similar

Air Canada

18 Nov

ORD08:45Chicago O'Hare Intl

31h 50m

2 stops

SYD09:35Sydney Kingsford Smith

24 Feb

SYD11:20Sydney Kingsford Smith

37h 45m

2 stops

ORD08:05Chicago O'Hare Intl

$1,294

Find similar

Air Canada

19 Aug

ORD10:40Chicago O'Hare Intl

29h 40m

2 stops

SYD07:20Sydney Kingsford Smith

24 Sept

SYD09:20Sydney Kingsford Smith

37h 41m

3 stops

ORD08:01Chicago O'Hare Intl

$1,299

Find similar

United Airlines flights from Illinois to Australia

Our best United Airlines deals on Illinois to Australia flight tickets

United Airlines

7 Aug

STL17:41Lambert-St Louis

22h 14m

1 stop

SYD06:55Sydney Kingsford Smith

20 Aug

SYD10:20Sydney Kingsford Smith

21h 33m

1 stop

STL16:53Lambert-St Louis

$1,975

Find similar

United Airlines

7 Aug

STL15:20Lambert-St Louis

24h 35m

2 stops

SYD06:55Sydney Kingsford Smith

20 Aug

SYD10:20Sydney Kingsford Smith

21h 13m

2 stops

STL16:33Lambert-St Louis

$2,057

Find similar

United Airlines

21 Nov

STL06:15Lambert-St Louis

31h 45m

1 stop

SYD07:00Sydney Kingsford Smith

5 Dec

SYD11:50Sydney Kingsford Smith

21h 14m

1 stop

STL16:04Lambert-St Louis

$2,100

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 19/8

10:40-07:20

2 stops29h 40m

Sydney Kingsford Smith

Wed 24/9

09:20-15:00

1 stop20h 40m

$1,288

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 18/11

08:45-09:35

2 stops31h 50m

Sydney Kingsford Smith

Tue 24/2

11:20-08:05

2 stops37h 45m

$1,294

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Sat 18/10

06:20-10:25

2 stops37h 05m

Brisbane

Fri 31/10

11:35-22:59

2 stops26h 24m

$1,470

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 20/10

06:20-12:45

2 stops38h 25m

Sydney Kingsford Smith

Sun 2/11

14:00-23:59

2 stops25h 59m

$1,486

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/11

17:57-10:55

2 stops23h 58m

Sydney Kingsford Smith

Sun 14/12

14:20-16:07

1 stop18h 47m

$1,671

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/11

13:20-06:55

1 stop24h 35m

Sydney Kingsford Smith

Sun 23/11

06:00-16:40

2 stops27h 40m

$1,683

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 24/11

16:25-10:30

1 stop25h 05m

Sydney Kingsford Smith

Sun 7/12

21:45-07:20

1 stop26h 35m

$1,776

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 24/11

18:00-20:15

2 stops33h 15m

Sydney Kingsford Smith

Sun 7/12

21:45-07:20

1 stop26h 35m

$1,784

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Tue 25/11

08:48-10:55

2 stops33h 07m

Melbourne

Sun 14/12

12:10-21:16

2 stops26h 06m

$1,903

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Wed 22/10

16:40-10:50

2 stops26h 10m

Melbourne

Wed 12/11

12:10-19:56

2 stops24h 46m

$1,944

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 $1,323. If you don’t want to visit Australia in August, then you should wait until May to fly from Illinois, when ticket prices are also cheap, with an average price of $1,339.

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 $1,421. 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 $3,797. 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 $1,822. 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 $2,503. 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 $1,702 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 $1,407 on momondo.

Can stopping save me money on Illinois to Australia flights?

You could potentially save up to 15% 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	$734
Fastest flight time	20h 24m
Direct flights	None
Airports in Australia	4 airports

The best one-way flight to Australia from Illinois in the past 72 hours is $734. The best return flight deal from Illinois to Australia found on momondo in the last 72 hours is $1,288.

The fastest flight from Illinois to Australia takes 20h 24m

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

There are 4 airports near Australia: 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 August 2025, there are 3 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 $1,318	Free cancellation	Rating 7.5 887 reviews		Search Qantas Airways flights
Air Canada	PriceFrom $1,687	Free cancellation	Rating 7.1 9,879 reviews		Search Air Canada 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.