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 22h 36m and 21h 09m, respectively.

$637 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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United Airlines

23 Aug

MEL

20h 41m

1 stop

ORD

30 Aug

ORD

25h 15m

1 stop

MEL

$1,371

United Airlines

21 Aug

MEL

20h 06m

1 stop

ORD

28 Aug

ORD

25h 40m

1 stop

MEL

$1,387

United Airlines

21 Aug

MEL

22h 35m

2 stops

ORD

28 Aug

ORD

24h 30m

2 stops

MEL

$1,392

Multiple Airlines

6 Sept

SYD

31h 44m

2 stops

ORD

13 Sept

ORD

38h 45m

3 stops

SYD

$1,411

Multiple Airlines

6 Sept

SYD

31h 44m

2 stops

ORD

13 Sept

ORD

31h 48m

3 stops

SYD

$1,415

Multiple Airlines

6 Sept

MEL

31h 29m

2 stops

ORD

13 Sept

ORD

32h 23m

3 stops

MEL

$1,458

Multiple Airlines

5 Sept

BNE

45h 09m

2 stops

ORD

12 Sept

ORD

37h 20m

3 stops

BNE

$1,477

Multiple Airlines

5 Sept

BNE

45h 09m

2 stops

ORD

12 Sept

ORD

37h 25m

3 stops

BNE

$1,483

Multiple Airlines

6 Sept

MEL

31h 29m

2 stops

ORD

13 Sept

ORD

34h 59m

3 stops

MEL

$1,503

Multiple Airlines

25 Aug

SYD

32h 02m

2 stops

ORD

30 Sept

ORD

38h 45m

3 stops

SYD

$1,526

Multiple Airlines

6 Sept

MEL

36h 25m

3 stops

MDW

13 Sept

MDW

39h 00m

3 stops

MEL

$1,540

Multiple Airlines

20 Aug

BNE

33h 04m

2 stops

ORD

27 Aug

ORD

48h 45m

3 stops

BNE

$1,547

Find the cheapest flights from Australia to Illinois

Return

One-way

Last minute

Recent return flight deals from Australia to Illinois

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09:30 - 14:36

MEL

ORD

20h 06m

1 stop

10:40 - 08:15

ORD

MEL

30h 35m

2 stops

$1,371United Airlines

Sun, 23 Aug - Sun, 30 Aug

09:30 - 17:05

MEL

ORD

22h 35m

2 stops

16:45 - 08:15

ORD

MEL

24h 30m

2 stops

$1,371United Airlines

Sun, 23 Aug - Sun, 30 Aug

13:15 - 11:17

SYD

STL

37h 02m

3 stops

12:17 - 11:50

STL

SYD

32h 33m

3 stops

$1,411Multiple Airlines

Wed, 9 Sep - Wed, 16 Sep

13:15 - 05:59

SYD

ORD

31h 44m

2 stops

06:05 - 11:50

ORD

SYD

38h 45m

3 stops

$1,411Multiple Airlines

Sun, 6 Sep - Sun, 13 Sep

10:10 - 23:46

SYD

STL

29h 36m

1 stop

12:58 - 06:55

STL

SYD

24h 57m

1 stop

$1,503American Airlines

Wed, 14 Oct - Sun, 8 Nov

11:05 - 19:48

SYD

STL

24h 43m

2 stops

06:02 - 09:00

STL

SYD

33h 58m

1 stop

$1,579American Airlines

Wed, 14 Oct - Sun, 8 Nov

18:50 - 23:46

SYD

STL

20h 56m

1 stop

14:54 - 06:55

STL

SYD

23h 01m

1 stop

$1,624Qantas Airways

Wed, 14 Oct - Sun, 8 Nov

09:10 - 22:59

SYD

STL

28h 49m

1 stop

06:00 - 07:05

STL

SYD

34h 05m

1 stop

$1,636Qantas Airways

Sun, 6 Sep - Sun, 13 Sep

11:55 - 00:59

SYD

ORD

28h 04m

2 stops

13:00 - 08:45

ORD

SYD

28h 45m

2 stops

$1,740Air New Zealand

Wed, 9 Sep - Sat, 19 Sep

12:20 - 21:45

BNE

ORD

24h 25m

2 stops

16:00 - 11:05

ORD

BNE

28h 05m

2 stops

$1,760Air New Zealand

Wed, 9 Sep - Wed, 16 Sep

Fly from

Route

Depart

Return

Price

Cheapest return flight

MelbourneChicago

MEL - ORD

MELORD

Melbourne

Sun 23/8

09:30-14:36

1 stop20h 06m

Chicago O'Hare Intl

Sun 30/8

10:40-08:15

2 stops30h 35m

$1,371

MelbourneChicago

MEL - ORD

MELORD

Melbourne

Sun 23/8

09:30-17:05

2 stops22h 35m

Chicago O'Hare Intl

Sun 30/8

16:45-08:15

2 stops24h 30m

$1,371

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 9/9

13:15-11:17

3 stops37h 02m

Lambert-St Louis

Wed 16/9

12:17-11:50

3 stops32h 33m

$1,411

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 6/9

13:15-05:59

2 stops31h 44m

Chicago O'Hare Intl

Sun 13/9

06:05-11:50

3 stops38h 45m

$1,411

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 14/10

10:10-23:46

1 stop29h 36m

Lambert-St Louis

Sun 8/11

12:58-06:55

1 stop24h 57m

$1,503

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 14/10

11:05-19:48

2 stops24h 43m

Lambert-St Louis

Sun 8/11

06:02-09:00

1 stop33h 58m

$1,578

Fastest return journey

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 14/10

18:50-23:46

1 stop20h 56m

Lambert-St Louis

Sun 8/11

14:54-06:55

1 stop23h 01m

$1,624

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 6/9

09:10-22:59

1 stop28h 49m

Lambert-St Louis

Sun 13/9

06:00-07:05

1 stop34h 05m

$1,636

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 9/9

11:55-00:59

2 stops28h 04m

Chicago O'Hare Intl

Sat 19/9

13:00-08:45

2 stops28h 45m

$1,740

BrisbaneChicago

BNE - ORD

BNEORD

Brisbane

Wed 9/9

12:20-21:45

2 stops24h 25m

Chicago O'Hare Intl

Wed 16/9

16:00-11:05

2 stops28h 05m

$1,760

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, Air New Zealand 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 30% of people opting to fly with this airline when travelling to Illinois. Keep in mind that there are 8 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	$637
Best Round-Trip Price	$1,371
Fastest flight time	29h 23m

The best one-way flight price to Illinois from Australia in the last 5 days is $637 (Sydney Kingsford Smith to Chicago O'Hare Intl).

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The best return flight price to Illinois from Australia in the last 5 days is $1,371 (Melbourne to Chicago O'Hare Intl).

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The fastest flight to Illinois from Australia takes 29h 23m (Brisbane to Chicago Midway).

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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 $135/pp, you can find flights to Illinois depending on where you are departing from. On average, flights to Illinois cost $697/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 Water Tower and Chicago Riverwalk 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 8 airlines that fly to Illinois on a routine basis, but Qantas Airways, Air New Zealand and Air Canada happen to be the most popular among our users. In the past year, 30% 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 8 as of July 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.