How long is the flight from Australia to Illinois?

If you’re flying from a popular airport in Australia, such as Sydney Kingsford Smith or Melbourne, and flying into Illinois, then you can expect flight times to average 21h 39m and 20h 43m, respectively.

$889 Cheap Flights to Illinois in 2026

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Recent flights found to popular cities in Illinois

Find flights to these popular cities in Illinois from your nearest airport.

Flights to Chicago

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ANA

6 Oct

SYD

32h 20m

2 stops

ORD

2 Nov

ORD

25h 05m

1 stop

SYD

$1,573

Multiple Airlines

18 May

SYD

27h 49m

1 stop

ORD

2 June

ORD

32h 50m

2 stops

SYD

$1,687

Multiple Airlines

8 June

SYD

31h 09m

2 stops

ORD

15 June

ORD

33h 15m

1 stop

SYD

$1,797

ANA

14 June

SYD

38h 40m

2 stops

ORD

20 July

ORD

24h 40m

1 stop

SYD

$1,799

Multiple Airlines

12 May

SYD

27h 49m

1 stop

ORD

2 June

ORD

42h 53m

2 stops

SYD

$1,808

Multiple Airlines

3 June

SYD

27h 09m

1 stop

ORD

10 June

ORD

33h 18m

2 stops

SYD

$1,832

Multiple Airlines

19 May

SYD

27h 49m

1 stop

ORD

3 June

ORD

32h 50m

2 stops

SYD

$1,833

Multiple Airlines

8 June

SYD

27h 14m

1 stop

ORD

15 June

ORD

33h 15m

1 stop

SYD

$1,840

Multiple Airlines

20 July

SYD

27h 27m

1 stop

ORD

10 Aug

ORD

31h 02m

2 stops

SYD

$1,841

Multiple Airlines

9 June

SYD

26h 42m

2 stops

ORD

16 June

ORD

43h 17m

1 stop

SYD

$1,844

Multiple Airlines

9 June

SYD

26h 42m

2 stops

ORD

16 June

ORD

43h 17m

1 stop

SYD

$1,847

Multiple Airlines

9 June

SYD

31h 09m

2 stops

ORD

16 June

ORD

24h 24m

2 stops

SYD

$1,854

Find the cheapest flights from Australia to Illinois

Round-trip

One-way

Last minute

Recent return flight deals from Australia to Illinois

Enter your travel dates to find the best prices.

09:20 - 12:06

SYD

STL

41h 46m

2 stops

16:48 - 07:20

STL

SYD

23h 32m

2 stops

$1,434Multiple Airlines

Wed, 20 May - Thu, 28 May

09:20 - 12:06

SYD

STL

41h 46m

2 stops

16:48 - 07:20

STL

SYD

23h 32m

2 stops

$1,437Multiple Airlines

Wed, 20 May - Thu, 28 May

09:20 - 23:57

SYD

STL

53h 37m

2 stops

08:40 - 07:20

STL

SYD

31h 40m

2 stops

$1,497Air Canada

Wed, 10 Jun - Wed, 17 Jun

09:20 - 23:57

SYD

STL

29h 37m

2 stops

08:40 - 07:20

STL

SYD

55h 40m

2 stops

$1,501Air Canada

Wed, 10 Jun - Wed, 17 Jun

10:55 - 20:43

MEL

STL

24h 48m

2 stops

13:38 - 08:15

STL

MEL

27h 37m

2 stops

$1,573United Airlines

Thu, 14 May - Tue, 26 May

10:55 - 22:30

MEL

STL

26h 35m

2 stops

19:23 - 08:15

STL

MEL

21h 52m

1 stop

$1,578United Airlines

Wed, 13 May - Mon, 25 May

09:45 - 15:49

MEL

ORD

21h 04m

1 stop

20:55 - 06:45

ORD

MEL

42h 50m

1 stop

$2,029Qantas Airways

Mon, 8 Jun - Mon, 15 Jun

09:45 - 15:52

MEL

ORD

21h 07m

1 stop

15:20 - 06:45

ORD

MEL

24h 25m

1 stop

$2,030Qantas Airways

Mon, 1 Jun - Mon, 22 Jun

12:10 - 23:10

MEL

ORD

26h 00m

2 stops

14:13 - 10:55

ORD

MEL

29h 42m

2 stops

$2,086Air New Zealand

Wed, 2 Sep - Wed, 9 Sep

09:40 - 21:47

BNE

ORD

27h 07m

2 stops

16:45 - 11:05

ORD

BNE

27h 20m

2 stops

$2,302Air New Zealand

Tue, 18 Aug - Tue, 1 Sep

Fly from

Route

Depart

Return

Price

Cheapest return flight

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Thu 28/5

16:48-07:20

2 stops23h 32m

$1,434

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Thu 28/5

16:48-07:20

2 stops23h 32m

$1,437

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 10/6

09:20-23:57

2 stops53h 37m

Lambert-St Louis

Wed 17/6

08:40-07:20

2 stops31h 40m

$1,497

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 10/6

09:20-23:57

2 stops29h 37m

Lambert-St Louis

Wed 17/6

08:40-07:20

2 stops55h 40m

$1,501

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Thu 14/5

10:55-20:43

2 stops24h 48m

Lambert-St Louis

Tue 26/5

13:38-08:15

2 stops27h 37m

$1,573

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Wed 13/5

10:55-22:30

2 stops26h 35m

Lambert-St Louis

Mon 25/5

19:23-08:15

1 stop21h 52m

$1,578

MelbourneChicago

MEL - ORD

MELORD

Melbourne

Mon 8/6

09:45-15:49

1 stop21h 04m

Chicago O'Hare Intl

Mon 15/6

20:55-06:45

1 stop42h 50m

$2,029

Fastest return journey

MelbourneChicago

MEL - ORD

MELORD

Melbourne

Mon 1/6

09:45-15:52

1 stop21h 07m

Chicago O'Hare Intl

Mon 22/6

15:20-06:45

1 stop24h 25m

$2,030

MelbourneChicago

MEL - ORD

MELORD

Melbourne

Wed 2/9

12:10-23:10

2 stops26h 00m

Chicago O'Hare Intl

Wed 9/9

14:13-10:55

2 stops29h 42m

$2,086

BrisbaneChicago

BNE - ORD

BNEORD

Brisbane

Tue 18/8

09:40-21:47

2 stops27h 07m

Chicago O'Hare Intl

Tue 1/9

16:45-11:05

2 stops27h 20m

$2,302

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

Illinois flights insights and trends

Explore insights for your Illinois flight to craft the best travel plan

Airlines

Other information

Which airlines fly to Illinois?

Qantas Airways, United Airlines and Air Canada 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 33% of people opting to fly with this airline when travelling to Illinois. Keep in mind that there are 9 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

Cheapest flights to cities in Illinois

Click on the cities below to find out when it's cheapest to fly to Illinois from Australia

Chicago

Find flights to Chicago

Cheap Illinois flight deals and tips

Summary info about Illinois flight prices, duration and airlines

Best One-Way Price	$889
Best Round-Trip Price	$1,434
Fastest flight time	29h 12m

The best one-way flight price to Illinois from Australia in the last 72 hours is $889 (Melbourne to Chicago O'Hare Intl).

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The best round-trip flight price to Illinois from Australia in the last 72 hours is $1,434 (Sydney Kingsford Smith to Lambert-St Louis).

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The fastest flight to Illinois from Australia takes 29h 12m (Melbourne to Lambert-St Louis).

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Frequently asked questions about flying to Illinois

What is the cheapest flight I can find to Illinois?

For prices as low as $71/pp, you can find flights to Illinois depending on where you are departing from. On average, flights to Illinois cost $806/pp.

What is the best airport to fly into to visit Chicago?

Chicago is about 99% more popular to visit than any other city in Illinois, according to momondo users. When visiting Chicago, it is recommended to fly into Chicago O'Hare Intl Airport, where you can typically get the cheapest prices and the most convenient travel options into the city.

I plan on visiting River North. Which airport is the quickest drive?

The closest airport to River North is Chicago O'Hare Intl Airport, and would make for the quickest drive. For those interested in a secondary airport to fly into, consider looking at flights heading to Chicago Midway Airport.

What are the most popular landmarks in Illinois?

When visiting Illinois, the majority of people tend to find River North, Chicago Riverwalk and Millennium Park to be the most notable landmarks in the area.

What is the weather like in Illinois?

The temperatures in Illinois range from -5 °C to 23 °C depending on the time of year. The warmest month in Illinois is July, and the coldest month in Illinois is January. Those looking for a drier month during their visit should travel during the months of January, February, or December, when rain is least likely compared to the rest of the year.

Which airlines fly to Illinois?

There are 9 airlines that fly to Illinois on a routine basis, but Qantas Airways, United Airlines and Air Canada happen to be the most popular among our users. In the past year, 33% of those who searched for flights to Illinois looked to travel with Qantas Airways, making this airline the top choice among momondo travellers.

When did momondo last update prices for flights to Illinois?

Prices for flights to Illinois refresh daily.

How many operators does momondo search for flights to Illinois?

The number of operators available for flights to Illinois is 10 as of April 2026.

How old do you have to be to fly 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 stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel 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 licence, 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.

Why use momondo?

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

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

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

Yes. momondo enables you to select and highlight flights to Illinois with this policy.

How can momondo help me find flights to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as filter your options to help you make an informed choice when booking flights to Illinois.

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

Yes. momondo can track flight prices for Illinois and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.