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

Cathay Pacific, Qatar Airways, and Etihad Airways 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 Perth (a popular airport in Australia) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 22h 20m on average. If you fly from Sydney (another popular airport in Australia) to Chicago O'Hare Intl Airport, then the average flight time is 28h 42m.

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 2 operators available for flights from Australia to Illinois as of September 2026.

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.

$531 Cheap Flights from Australia to Illinois in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Australia to Illinois

Round-trip

One-way

Last minute

Recent round-trip flight deals from Australia to Illinois

Enter your travel dates to find the best prices.

2:00 pm - 5:13 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

32h 13m3 stops Nadi Los Angeles Los Angeles Las Vegas Harry Reid Intl

6:30 am - 12:35 pmORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

37h 05m3 stops Denver Intl Los Angeles Los Angeles Nadi

$908Multiple Airlines

Mon, Nov 2 - Mon, Nov 9

2:00 pm - 5:13 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

32h 13m3 stops Nadi Los Angeles Los Angeles Las Vegas Harry Reid Intl

6:30 am - 12:35 pmORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

37h 05m3 stops Denver Intl Los Angeles Los Angeles Nadi

$974Multiple Airlines

Mon, Nov 2 - Mon, Nov 9

12:15 pm - 12:30 pmBNE Brisbane-ORD Chicago O'Hare Intl

40h 15m1 stop Hong Kong Intl

2:10 pm - 11:20 pmORD Chicago O'Hare Intl-BNE Brisbane

41h 10m1 stop Hong Kong Intl

$1,123Cathay Pacific

Mon, Feb 22 - Mon, Mar 8

12:50 am - 12:30 pmBNE Brisbane-ORD Chicago O'Hare Intl

27h 40m1 stop Hong Kong Intl

2:10 pm - 11:20 pmORD Chicago O'Hare Intl-BNE Brisbane

41h 10m1 stop Hong Kong Intl

$1,123Cathay Pacific

Tue, Nov 3 - Wed, Nov 11

1:20 pm - 5:54 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 34m1 stop San Francisco

7:06 pm - 6:20 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

42h 14m1 stop San Francisco

$1,244United Airlines

Wed, Jan 20 - Sat, Feb 13

12:45 pm - 9:40 pmMEL Melbourne-STL Lambert-St Louis

25h 55m2 stops San Francisco Chicago O'Hare Intl

9:40 am - 10:30 amSTL Lambert-St Louis-MEL Melbourne

31h 50m2 stops Chicago O'Hare Intl San Francisco

$1,289United Airlines

Tue, Nov 3 - Tue, Nov 10

12:45 pm - 6:05 pmMEL Melbourne-STL Lambert-St Louis

22h 20m1 stop San Francisco

8:00 am - 10:30 amSTL Lambert-St Louis-MEL Melbourne

33h 30m1 stop San Francisco

$1,289United Airlines

Tue, Nov 3 - Tue, Nov 10

12:45 pm - 6:05 pmMEL Melbourne-STL Lambert-St Louis

22h 20m1 stop San Francisco

5:00 am - 10:30 amSTL Lambert-St Louis-MEL Melbourne

36h 30m2 stops Chicago O'Hare Intl San Francisco

$1,289United Airlines

Tue, Nov 3 - Tue, Nov 10

10:10 am - 3:59 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

21h 49m1 stop Los Angeles Los Angeles

6:55 pm - 9:00 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

22h 05m1 stop Los Angeles Los Angeles

$1,371Qantas Airways

Sun, Oct 11 - Mon, Oct 26

11:10 am - 6:38 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

23h 28m1 stop Los Angeles Los Angeles

6:45 pm - 9:00 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

21h 15m1 stop Los Angeles Los Angeles

$1,884Qantas Airways

Tue, Oct 27 - Wed, Nov 11

Recent last minute flight deals from Australia to Illinois

Enter your travel dates to find the best prices.

9:30 am - 5:38 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

35h 08m2 stops Los Angeles Los Angeles Las Vegas Harry Reid Intl

6:30 am - 7:00 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

33h 30m2 stops Denver Intl Los Angeles Los Angeles

$1,516Multiple Airlines

Tue, Sep 22 - Tue, Sep 29

10:10 am - 1:55 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

42h 45m1 stop Hong Kong Intl

4:15 pm - 11:45 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

28h 30m1 stop Hong Kong Intl

$1,654Cathay Pacific

Tue, Sep 22 - Wed, Sep 30

9:55 pm - 1:55 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

31h 00m1 stop Hong Kong Intl

4:15 pm - 6:10 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

46h 55m1 stop Hong Kong Intl

$1,696Cathay Pacific

Tue, Sep 22 - Tue, Sep 29

7:45 pm - 1:55 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

33h 10m2 stops Perth Hong Kong Intl

4:15 pm - 6:10 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

46h 55m1 stop Hong Kong Intl

$1,756Multiple Airlines

Tue, Sep 22 - Tue, Sep 29

7:45 pm - 1:55 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

33h 10m2 stops Perth Hong Kong Intl

4:15 pm - 8:10 pmORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

36h 55m1 stop Hong Kong Intl

$1,756Multiple Airlines

Tue, Sep 22 - Wed, Sep 30

7:25 am - 1:55 pmMEL Melbourne-ORD Chicago O'Hare Intl

45h 30m1 stop Hong Kong Intl

4:15 pm - 5:55 amORD Chicago O'Hare Intl-MEL Melbourne

46h 40m1 stop Hong Kong Intl

$1,772Cathay Pacific

Mon, Sep 21 - Sun, Sep 27

11:45 pm - 1:55 pmMEL Melbourne-ORD Chicago O'Hare Intl

29h 10m1 stop Hong Kong Intl

4:15 pm - 10:15 pmORD Chicago O'Hare Intl-MEL Melbourne

39h 00m1 stop Hong Kong Intl

$1,772Cathay Pacific

Wed, Sep 23 - Wed, Sep 30

7:25 am - 1:55 pmMEL Melbourne-ORD Chicago O'Hare Intl

45h 30m1 stop Hong Kong Intl

4:15 pm - 5:55 amORD Chicago O'Hare Intl-MEL Melbourne

46h 40m1 stop Hong Kong Intl

$1,774Cathay Pacific

Mon, Sep 21 - Sun, Sep 27

7:40 am - 1:55 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

45h 15m1 stop Hong Kong Intl

4:15 pm - 8:10 pmORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

36h 55m1 stop Hong Kong Intl

$1,777Cathay Pacific

Wed, Sep 23 - Thu, Sep 24

9:10 am - 2:20 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

20h 10m1 stop Los Angeles Los Angeles

5:50 pm - 7:05 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

22h 15m1 stop Los Angeles Los Angeles

$2,056Qantas Airways

Tue, Sep 22 - Wed, Sep 30

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Cathay Pacific flights from Australia to Illinois

Our best Cathay Pacific deals on Australia to Illinois flight tickets

Cathay Pacific

Nov 3

BNE12:50 amBrisbane

27h 40m

1 stop

ORD12:30 pmChicago O'Hare Intl

Nov 11

ORD2:10 pmChicago O'Hare Intl

41h 10m

1 stop

BNE11:20 pmBrisbane

$1,123

Cathay Pacific

Nov 2

BNE12:15 pmBrisbane

40h 15m

1 stop

ORD12:30 pmChicago O'Hare Intl

Nov 9

ORD2:10 pmChicago O'Hare Intl

28h 35m

1 stop

BNE10:45 amBrisbane

$1,128

Cathay Pacific

Nov 5

BNE12:15 pmBrisbane

40h 15m

1 stop

ORD12:30 pmChicago O'Hare Intl

Nov 9

ORD2:10 pmChicago O'Hare Intl

28h 35m

1 stop

BNE10:45 amBrisbane

$1,182

Air New Zealand flights from Australia to Illinois

Our best Air New Zealand deals on Australia to Illinois flight tickets

Air New Zealand

Nov 10

SYD7:30 amSydney Kingsford Smith

31h 30m

2 stops

ORD10:00 pmChicago O'Hare Intl

Nov 17

ORD9:21 amChicago O'Hare Intl

30h 14m

2 stops

SYD8:35 amSydney Kingsford Smith

$1,205

Air New Zealand

Feb 22

BNE8:20 amBrisbane

30h 07m

2 stops

ORD10:27 pmChicago O'Hare Intl

Mar 8

ORD11:00 amChicago O'Hare Intl

28h 00m

2 stops

BNE7:00 amBrisbane

$1,259

Air New Zealand

Jan 26

SYD9:55 amSydney Kingsford Smith

27h 30m

2 stops

ORD8:25 pmChicago O'Hare Intl

Feb 26

ORD3:00 pmChicago O'Hare Intl

24h 35m

2 stops

SYD8:35 amSydney Kingsford Smith

$1,296

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Mon 11/2

2:00 pm-5:13 am

3 stops32h 13m

Chicago O'Hare Intl

Mon 11/9

6:30 am-12:35 pm

3 stops37h 05m

$908

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Mon 11/2

2:00 pm-5:13 am

3 stops32h 13m

Chicago O'Hare Intl

Mon 11/9

6:30 am-12:35 pm

3 stops37h 05m

$974

BrisbaneChicago

BNE Brisbane - ORD Chicago O'Hare Intl

BNEORD

Brisbane

Mon 2/22

12:15 pm-12:30 pm

1 stop40h 15m

Chicago O'Hare Intl

Mon 3/8

2:10 pm-11:20 pm

1 stop41h 10m

$1,123

BrisbaneChicago

BNE Brisbane - ORD Chicago O'Hare Intl

BNEORD

Brisbane

Tue 11/3

12:50 am-12:30 pm

1 stop27h 40m

Chicago O'Hare Intl

Wed 11/11

2:10 pm-11:20 pm

1 stop41h 10m

$1,123

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 1/20

1:20 pm-5:54 pm

1 stop21h 34m

Lambert-St Louis

Sat 2/13

7:06 pm-6:20 am

1 stop42h 14m

$1,244

MelbourneSt. Louis

MEL Melbourne - STL Lambert-St Louis

MELSTL

Melbourne

Tue 11/3

12:45 pm-9:40 pm

2 stops25h 55m

Lambert-St Louis

Tue 11/10

9:40 am-10:30 am

2 stops31h 50m

$1,289

MelbourneSt. Louis

MEL Melbourne - STL Lambert-St Louis

MELSTL

Melbourne

Tue 11/3

12:45 pm-6:05 pm

1 stop22h 20m

Lambert-St Louis

Tue 11/10

8:00 am-10:30 am

1 stop33h 30m

$1,289

MelbourneSt. Louis

MEL Melbourne - STL Lambert-St Louis

MELSTL

Melbourne

Tue 11/3

12:45 pm-6:05 pm

1 stop22h 20m

Lambert-St Louis

Tue 11/10

5:00 am-10:30 am

2 stops36h 30m

$1,289

Quickest round-trip

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Sun 10/11

10:10 am-3:59 pm

1 stop21h 49m

Chicago O'Hare Intl

Mon 10/26

6:55 pm-9:00 am

1 stop22h 05m

$1,371

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Tue 10/27

11:10 am-6:38 pm

1 stop23h 28m

Chicago O'Hare Intl

Wed 11/11

6:45 pm-9:00 am

1 stop21h 15m

$1,884

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 May. Flight prices, which tend to average around $1,140, 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 May, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,143.

How far in advance should I book a flight from Australia 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 $1,442 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 $875 on momondo.

Can stopping save me money on Australia to Illinois flights?

You could potentially save up to 6% 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

Best Price Found	$531
Fastest flight time	19h 57m
Direct flights	None

The best one-way flight to Illinois from Australia in the past 72 hours is $531. The best round-trip flight deal from Australia to Illinois found on momondo in the last 72 hours is $908.

The fastest flight from Australia to Illinois takes 19h 57m

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

Search flight deals

Frequently asked questions about flying 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 2 operators available for flights from Australia to Illinois as of September 2026.
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 $970	Free Cancellation	Rating 7.5 1,102 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,133	Free Cancellation	Rating 7.4 10,220 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.