How long is the flight from Australia to Illinois?

The flight from Australia to Illinois depends on which airports you’re departing and arriving from and whether or not you have a layover. If you fly from Adelaide (a popular airport in Australia) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 21h 25m on average. If you fly from Sydney (another popular airport in Australia) to Chicago O'Hare Intl Airport, then the average flight time is 23h 10m.

What airlines fly to Illinois?

Qantas Airways, United Airlines and American Airlines are the top three most popular airlines that fly to Illinois from Australia according to our data. Qantas Airways is the first choice among our users, with 36% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 5 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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

Air New Zealand, United Airlines, and Cathay Pacific are the most popular carriers operating from Australia to Illinois

When did momondo last update prices for flights from Australia to Illinois?

Prices for flights from Australia to Illinois were last updated today.

How many operators does momondo search for flights from Australia to Illinois?

There are 5 operators available for flights from Australia to Illinois as of November 2025.

How old do you have to be to fly from Australia to Illinois?

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 Australia to Illinois.

What documentation or ID do you need to fly to Illinois?

The travel and health documents required for your trip to Illinois 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 license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$519 Cheap Flights from Australia to Illinois in 2025/26

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Find the cheapest flights from Australia to Illinois

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Last minute

Recent round-trip flight deals from Australia to Illinois

Enter your travel dates to find the best prices.

11:30 am - 10:22 pmMEL-STL

27h 52m2 stops

6:30 am - 9:30 amSTL-MEL

34h 00m2 stops

$924United Airlines

Find Deal

Wed, Dec 24 - Wed, Dec 31

12:10 pm - 6:47 pmMEL-STL

23h 37m2 stops

6:15 am - 9:25 amSTL-MEL

34h 10m2 stops

$987Air New Zealand

Find Deal

Thu, Nov 20 - Wed, Dec 3

8:40 am - 9:10 amBNE-ORD

39h 30m2 stops

2:13 pm - 5:00 amORD-BNE

23h 47m1 stop

$1,148American Airlines

Find Deal

Wed, Mar 11 - Sun, Mar 15

8:40 am - 9:10 amBNE-ORD

39h 30m2 stops

9:45 am - 5:00 amORD-BNE

28h 15m1 stop

$1,151American Airlines

Find Deal

Thu, Mar 12 - Mon, Mar 16

11:20 am - 4:42 pmSYD-ORD

22h 22m1 stop

10:35 am - 9:35 amORD-SYD

30h 00m2 stops

$1,212Air Canada

Find Deal

Mon, Feb 2 - Thu, Feb 19

11:20 am - 8:05 amSYD-ORD

37h 45m3 stops

8:45 am - 9:35 amORD-SYD

31h 50m2 stops

$1,219Air Canada

Find Deal

Mon, Feb 2 - Thu, Feb 19

7:20 am - 1:40 pmMEL-ORD

23h 20m1 stop

10:20 am - 5:40 amORD-MEL

26h 20m1 stop

$1,409Japan Airlines

Find Deal

Thu, Nov 20 - Wed, Dec 3

6:30 am - 4:09 pmSYD-STL

25h 39m2 stops

6:30 am - 9:00 amSTL-SYD

34h 30m1 stop

$1,418Qantas Airways

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Thu, Mar 12 - Mon, Mar 16

6:30 am - 2:02 pmSYD-STL

23h 32m2 stops

6:30 am - 9:00 amSTL-SYD

34h 30m1 stop

$1,421Qantas Airways

Find Deal

Thu, Mar 12 - Mon, Mar 16

9:15 am - 9:18 pmSYD-ORD

29h 03m2 stops

6:00 am - 6:50 amORD-SYD

31h 50m2 stops

$1,564Japan Airlines

Find Deal

Mon, Dec 1 - Wed, Dec 3

Cathay Pacific flights from Australia to Illinois

Our best Cathay Pacific deals on Australia to Illinois flight tickets

Cathay Pacific

Mar 17

BNE12:10 pmBrisbane

40h 45m

1 stop

ORD1:55 pmChicago O'Hare Intl

Apr 1

ORD4:00 pmChicago O'Hare Intl

39h 25m

1 stop

BNE10:25 pmBrisbane

$1,042

Find similar

Cathay Pacific

Mar 17

BNE12:10 pmBrisbane

40h 45m

1 stop

ORD1:55 pmChicago O'Hare Intl

Apr 1

ORD4:00 pmChicago O'Hare Intl

39h 25m

1 stop

BNE10:25 pmBrisbane

$1,045

Find similar

Cathay Pacific

Mar 11

BNE12:10 pmBrisbane

40h 45m

1 stop

ORD1:55 pmChicago O'Hare Intl

Mar 15

ORD3:35 pmChicago O'Hare Intl

40h 25m

1 stop

BNE11:00 pmBrisbane

$1,048

Find similar

American Airlines flights from Australia to Illinois

Our best American Airlines deals on Australia to Illinois flight tickets

American Airlines

Mar 11

BNE8:40 amBrisbane

39h 30m

2 stops

ORD9:10 amChicago O'Hare Intl

Mar 15

ORD2:13 pmChicago O'Hare Intl

23h 47m

1 stop

BNE5:00 amBrisbane

$1,148

Find similar

American Airlines

Mar 12

BNE8:40 amBrisbane

39h 30m

2 stops

ORD9:10 amChicago O'Hare Intl

Mar 16

ORD9:45 amChicago O'Hare Intl

28h 15m

1 stop

BNE5:00 amBrisbane

$1,151

Find similar

American Airlines

Mar 13

MEL4:05 pmMelbourne

21h 02m

1 stop

ORD9:07 pmChicago O'Hare Intl

Mar 27

ORD9:45 amChicago O'Hare Intl

31h 45m

1 stop

MEL9:30 amMelbourne

$1,424

Find similar

Fly from

Fly to

Route

Depart

Return

Price

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Wed 12/24

11:30 am-10:22 pm

2 stops27h 52m

Lambert-St Louis

Wed 12/31

6:30 am-9:30 am

2 stops34h 00m

$924

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Thu 11/20

12:10 pm-6:47 pm

2 stops23h 37m

Lambert-St Louis

Wed 12/3

6:15 am-9:25 am

2 stops34h 10m

$987

BrisbaneChicago

BNE - ORD

BNEORD

Brisbane

Wed 3/11

8:40 am-9:10 am

2 stops39h 30m

Chicago O'Hare Intl

Sun 3/15

2:13 pm-5:00 am

1 stop23h 47m

$1,148

BrisbaneChicago

BNE - ORD

BNEORD

Brisbane

Thu 3/12

8:40 am-9:10 am

2 stops39h 30m

Chicago O'Hare Intl

Mon 3/16

9:45 am-5:00 am

1 stop28h 15m

$1,151

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 2/2

11:20 am-4:42 pm

1 stop22h 22m

Chicago O'Hare Intl

Thu 2/19

10:35 am-9:35 am

2 stops30h 00m

$1,212

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 2/2

11:20 am-8:05 am

3 stops37h 45m

Chicago O'Hare Intl

Thu 2/19

8:45 am-9:35 am

2 stops31h 50m

$1,219

MelbourneChicago

MEL - ORD

MELORD

Melbourne

Thu 11/20

7:20 am-1:40 pm

1 stop23h 20m

Chicago O'Hare Intl

Wed 12/3

10:20 am-5:40 am

1 stop26h 20m

$1,409

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 3/12

6:30 am-4:09 pm

2 stops25h 39m

Lambert-St Louis

Mon 3/16

6:30 am-9:00 am

1 stop34h 30m

$1,418

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 3/12

6:30 am-2:02 pm

2 stops23h 32m

Lambert-St Louis

Mon 3/16

6:30 am-9:00 am

1 stop34h 30m

$1,421

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 12/1

9:15 am-9:18 pm

2 stops29h 03m

Chicago O'Hare Intl

Wed 12/3

6:00 am-6:50 am

2 stops31h 50m

$1,564

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 Australia to Illinois

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 Illinois?

The cheapest month to fly to Illinois from Australia is in March. Flight prices, which tend to average around $735, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of March, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $740.

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

The cheapest day to depart from Australia to Illinois is on a Thursday when prices can be found for as low as $1,103. Flights from Australia to Illinois on a Monday will generally be more expensive and average around $1,626. 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 Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Australia to Illinois during this time can be as low as $1,141. Flights in the morning are often more expensive with an average ticket price of $1,365.

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

You are more likely to see cheaper flights to Illinois from Australia when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $974 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Australia for as low as $776 on momondo.

Can stopping save me money on Australia to Illinois flights?

You could potentially save up to 38% on your flight if you consider stops on a Australia to Illinois flight.

Cheap Australia to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Australia to Illinois

Direct flights	None

There are no direct flights from Australia to Illinois. There are no popular flight routes from Australia to Illinois.

Search flight deals

When did momondo last update prices for flights from Australia to Illinois?
Prices for flights from Australia to Illinois were last updated today.
How many operators does momondo search for flights from Australia to Illinois?
There are 5 operators available for flights from Australia to Illinois as of November 2025.
How old do you have to be to fly from Australia to Illinois?
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 Australia to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents required for your trip to Illinois 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 license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Australia to Illinois

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

Airline	Rating	Free Cancellation	Price
Qantas Airways	PriceFrom $631	Free Cancellation	Rating 7.5 933 reviews	Search Qantas Airways flights
Air Canada	PriceFrom $862	Free Cancellation	Rating 7.1 10,429 reviews	Search Air Canada flights
American Airlines	PriceFrom $884	Free Cancellation	Rating 7.2 11,047 reviews	Search American Airlines flights
Japan Airlines	PriceFrom $965	Free Cancellation	Rating 8.3 1,608 reviews	Search Japan Airlines flights
United Airlines	PriceFrom $1,080	Free Cancellation	Rating 7.4 9,011 reviews	Search United Airlines flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Australia to Illinois. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for Australia to Illinois flights to just show those with flexible booking policies.

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

Once all potential Australia to Illinois flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

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