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

Air Canada, American Airlines, and Delta are the most popular carriers operating from Australia to Illinois

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 Sydney (a popular airport in Australia) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 23h 05m on average. If you fly from Melbourne (another popular airport in Australia) to Chicago O'Hare Intl Airport, then the average flight time is 24h 11m.

What airlines fly to Illinois?

American Airlines, Qantas Airways and United Airlines are the top three most popular airlines that fly to Illinois from Australia according to our data. American Airlines 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.

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 September 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.

$437 Cheap Flights from Australia to Illinois in 2025/26

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Find the cheapest flights from Australia to Illinois

Round-trip

One-way

Last minute

Recent round-trip flight deals from Australia to Illinois

10:20 am - 3:29 pmSYD-STL

45h 09m2 stops

4:05 pm - 8:35 amSTL-SYD

48h 30m2 stops

$810Air Canada

Find Deal

jue., mar. 12 - lun., mar. 16

10:20 am - 3:29 pmSYD-STL

45h 09m2 stops

1:30 pm - 8:35 amSTL-SYD

27h 05m2 stops

$817Air Canada

Find Deal

jue., mar. 12 - lun., mar. 16

11:20 am - 12:42 amSYD-STL

29h 22m1 stop

7:00 am - 9:00 amSTL-SYD

33h 00m1 stop

$845American Airlines

Find Deal

dom., nov. 2 - dom., nov. 9

12:00 pm - 4:27 pmMEL-STL

20h 27m1 stop

9:00 am - 10:00 amSTL-MEL

32h 00m2 stops

$846United Airlines

Find Deal

sáb., nov. 1 - sáb., nov. 8

11:20 am - 12:42 amSYD-STL

29h 22m1 stop

2:29 pm - 9:00 amSTL-SYD

25h 31m2 stops

$849American Airlines

Find Deal

dom., nov. 2 - dom., nov. 9

11:50 am - 3:50 pmSYD-STL

20h 00m1 stop

4:43 pm - 9:15 amSTL-SYD

47h 32m2 stops

$852United Airlines

Find Deal

vie., oct. 31 - vie., nov. 7

5:45 pm - 11:59 pmSYD-ORD

23h 14m1 stop

12:25 pm - 6:10 amORD-SYD

24h 45m1 stop

$1,057Qantas Airways

Find Deal

mié., nov. 26 - mar., ene. 27

5:45 pm - 9:24 pmSYD-ORD

20h 39m1 stop

6:23 pm - 9:00 amORD-SYD

21h 37m1 stop

$1,149Qantas Airways

Find Deal

sáb., nov. 8 - sáb., nov. 22

7:20 am - 2:40 pmMEL-ORD

23h 20m1 stop

10:20 am - 5:40 amORD-MEL

26h 20m1 stop

$1,355Japan Airlines

Find Deal

jue., oct. 30 - mar., nov. 4

4:55 pm - 2:40 pmMEL-ORD

37h 45m2 stops

10:20 am - 5:40 amORD-MEL

26h 20m1 stop

$1,363Japan Airlines

Find Deal

jue., oct. 30 - mar., nov. 4

ANA flights from Australia to Illinois

Our best ANA deals on Australia to Illinois flight tickets

ANA

Nov 18

SYD12:25 pmSydney Kingsford Smith

35h 55m

1 stop

ORD7:20 amChicago O'Hare Intl

Dec 2

ORD7:10 amChicago O'Hare Intl

44h 05m

2 stops

SYD8:15 pmSydney Kingsford Smith

$1,109

Find similar

ANA

Dec 3

SYD12:25 pmSydney Kingsford Smith

35h 55m

1 stop

ORD7:20 amChicago O'Hare Intl

Dec 8

ORD6:05 pmChicago O'Hare Intl

33h 10m

2 stops

SYD8:15 pmSydney Kingsford Smith

$1,110

Find similar

ANA

Dec 3

SYD12:25 pmSydney Kingsford Smith

35h 55m

1 stop

ORD7:20 amChicago O'Hare Intl

Dec 8

ORD6:05 pmChicago O'Hare Intl

33h 10m

2 stops

SYD8:15 pmSydney Kingsford Smith

$1,126

Find similar

Qantas Airways flights from Australia to Illinois

Our best Qantas Airways deals on Australia to Illinois flight tickets

Qantas Airways

Nov 26

SYD5:45 pmSydney Kingsford Smith

23h 14m

1 stop

ORD11:59 pmChicago O'Hare Intl

Jan 27

ORD12:25 pmChicago O'Hare Intl

24h 45m

1 stop

SYD6:10 amSydney Kingsford Smith

$1,057

Find similar

Qantas Airways

Nov 8

SYD5:45 pmSydney Kingsford Smith

20h 39m

1 stop

ORD9:24 pmChicago O'Hare Intl

Nov 22

ORD6:23 pmChicago O'Hare Intl

21h 37m

1 stop

SYD9:00 amSydney Kingsford Smith

$1,149

Find similar

Qantas Airways

Mar 1

ADL7:50 amAdelaide

24h 30m

2 stops

ORD3:50 pmChicago O'Hare Intl

Mar 13

ORD5:10 pmChicago O'Hare Intl

27h 10m

2 stops

ADL11:50 amAdelaide

$1,226

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

jue. 3/12

10:20 am-3:29 pm

2 stops45h 09m

Lambert-St Louis

lun. 3/16

4:05 pm-8:35 am

2 stops48h 30m

$810

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

jue. 3/12

10:20 am-3:29 pm

2 stops45h 09m

Lambert-St Louis

lun. 3/16

1:30 pm-8:35 am

2 stops27h 05m

$817

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

dom. 11/2

11:20 am-12:42 am

1 stop29h 22m

Lambert-St Louis

dom. 11/9

7:00 am-9:00 am

1 stop33h 00m

$845

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

sáb. 11/1

12:00 pm-4:27 pm

1 stop20h 27m

Lambert-St Louis

sáb. 11/8

9:00 am-10:00 am

2 stops32h 00m

$846

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

dom. 11/2

11:20 am-12:42 am

1 stop29h 22m

Lambert-St Louis

dom. 11/9

2:29 pm-9:00 am

2 stops25h 31m

$849

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

vie. 10/31

11:50 am-3:50 pm

1 stop20h 00m

Lambert-St Louis

vie. 11/7

4:43 pm-9:15 am

2 stops47h 32m

$852

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

mié. 11/26

5:45 pm-11:59 pm

1 stop23h 14m

Chicago O'Hare Intl

mar. 1/27

12:25 pm-6:10 am

1 stop24h 45m

$1,057

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

sáb. 11/8

5:45 pm-9:24 pm

1 stop20h 39m

Chicago O'Hare Intl

sáb. 11/22

6:23 pm-9:00 am

1 stop21h 37m

$1,149

MelbourneChicago

MEL - ORD

MELORD

Melbourne

jue. 10/30

7:20 am-2:40 pm

1 stop23h 20m

Chicago O'Hare Intl

mar. 11/4

10:20 am-5:40 am

1 stop26h 20m

$1,355

MelbourneChicago

MEL - ORD

MELORD

Melbourne

jue. 10/30

4:55 pm-2:40 pm

2 stops37h 45m

Chicago O'Hare Intl

mar. 11/4

10:20 am-5:40 am

1 stop26h 20m

$1,363

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 $741, 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 February is also cheap. Prices for this month can be found on momondo for an average of $744.

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 $984 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 September 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 7.5 907 reviews	Search Qantas Airways flights
Air Canada	PriceFrom $862	Free Cancellation	Rating 7.1 10,000 reviews	Search Air Canada flights
American Airlines	PriceFrom $884	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Japan Airlines	PriceFrom $965	Free Cancellation	Rating 8.3 1,560 reviews	Search Japan Airlines flights
United Airlines	PriceFrom $1,080	Free Cancellation	Rating 7.4 8,926 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.