How long is the flight from Australia to Illinois?

If you’re flying from a popular airport in Australia, such as Sydney or Melbourne, and flying into Illinois, then you can expect flight times to average 19h 35m and 22h 32m, respectively.

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

United Airlines, Delta, and EVA Air are the most popular carriers operating from Australia to Illinois

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 59% of people opting to fly with this airline when travelling to Illinois. Keep in mind that there are 10 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 are updated daily.

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

As of September 2025, there are 10 operators available to choose from for flights from Australia to Illinois.

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 offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify 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 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.

$771 Cheap Flights from Australia to Illinois in 2025/26

1 adult

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Find the cheapest flights from Australia to Illinois

Round-trip

One-way

Last minute

Recent return flight deals from Australia to Illinois

11:20 - 23:42SYD-STL

29h 22m1 stop

11:35 - 09:00STL-SYD

28h 25m2 stops

$1,262American Airlines

Find Deal

Tue, 25 Nov - Fri, 12 Dec

11:50 - 22:45SYD-STL

27h 55m2 stops

06:15 - 09:05STL-SYD

33h 50m2 stops

$1,285United Airlines

Find Deal

Tue, 25 Nov - Thu, 11 Dec

10:45 - 15:29BNE-STL

44h 44m2 stops

16:05 - 08:45STL-BNE

48h 40m2 stops

$1,297Air Canada

Find Deal

Mon, 3 Nov - Mon, 10 Nov

10:45 - 14:29BNE-STL

43h 44m2 stops

16:30 - 07:45STL-BNE

24h 15m2 stops

$1,418Air Canada

Find Deal

Sun, 8 Mar - Tue, 10 Mar

12:10 - 22:59MEL-ORD

27h 49m2 stops

13:00 - 10:55ORD-MEL

28h 55m2 stops

$1,485Air New Zealand

Find Deal

Mon, 3 Nov - Tue, 11 Nov

09:55 - 18:50SYD-ORD

25h 55m2 stops

13:00 - 08:45ORD-SYD

26h 45m2 stops

$1,496Air New Zealand

Find Deal

Tue, 4 Nov - Tue, 11 Nov

23:55 - 14:25BNE-ORD

29h 30m1 stop

16:00 - 22:25ORD-BNE

39h 25m1 stop

$1,678Cathay Pacific

Find Deal

Tue, 14 Oct - Mon, 20 Oct

12:10 - 12:55BNE-ORD

40h 45m1 stop

14:35 - 23:00ORD-BNE

40h 25m1 stop

$1,679Cathay Pacific

Find Deal

Mon, 3 Nov - Mon, 10 Nov

11:20 - 23:42SYD-STL

29h 22m1 stop

06:55 - 07:25STL-SYD

31h 30m1 stop

$2,628Qantas Airways

Find Deal

Sat, 29 Nov - Thu, 11 Dec

11:20 - 23:59SYD-STL

29h 39m1 stop

06:55 - 09:00STL-SYD

33h 05m1 stop

$2,957Qantas Airways

Find Deal

Sun, 30 Nov - Mon, 15 Dec

Air New Zealand flights from Australia to Illinois

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

Air New Zealand

3 Nov

MEL12:10Melbourne

27h 49m

2 stops

ORD22:59Chicago O'Hare Intl

11 Nov

ORD13:00Chicago O'Hare Intl

28h 55m

2 stops

MEL10:55Melbourne

$1,485

Find similar

Air New Zealand

4 Nov

SYD09:55Sydney Kingsford Smith

25h 55m

2 stops

ORD18:50Chicago O'Hare Intl

11 Nov

ORD13:00Chicago O'Hare Intl

26h 45m

2 stops

SYD08:45Sydney Kingsford Smith

$1,496

Find similar

Air New Zealand

8 Nov

BNE08:20Brisbane

26h 30m

2 stops

ORD18:50Chicago O'Hare Intl

21 Nov

ORD14:30Chicago O'Hare Intl

27h 25m

2 stops

BNE09:55Brisbane

$1,497

Find similar

Cathay Pacific flights from Australia to Illinois

Our best Cathay Pacific deals on Australia to Illinois flight tickets

Cathay Pacific

14 Oct

BNE23:55Brisbane

29h 30m

1 stop

ORD14:25Chicago O'Hare Intl

20 Oct

ORD16:00Chicago O'Hare Intl

39h 25m

1 stop

BNE22:25Brisbane

$1,678

Find similar

Cathay Pacific

3 Nov

BNE12:10Brisbane

40h 45m

1 stop

ORD12:55Chicago O'Hare Intl

10 Nov

ORD14:35Chicago O'Hare Intl

40h 25m

1 stop

BNE23:00Brisbane

$1,679

Find similar

Cathay Pacific

3 Nov

BNE12:10Brisbane

40h 45m

1 stop

ORD12:55Chicago O'Hare Intl

10 Nov

ORD14:35Chicago O'Hare Intl

40h 25m

1 stop

BNE23:00Brisbane

$1,685

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 25/11

11:20-23:42

1 stop29h 22m

Lambert-St Louis

Fri 12/12

11:35-09:00

2 stops28h 25m

$1,262

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 25/11

11:50-22:45

2 stops27h 55m

Lambert-St Louis

Thu 11/12

06:15-09:05

2 stops33h 50m

$1,285

BrisbaneSt. Louis

BNE - STL

BNESTL

Brisbane

Mon 3/11

10:45-15:29

2 stops44h 44m

Lambert-St Louis

Mon 10/11

16:05-08:45

2 stops48h 40m

$1,297

BrisbaneSt. Louis

BNE - STL

BNESTL

Brisbane

Sun 8/3

10:45-14:29

2 stops43h 44m

Lambert-St Louis

Tue 10/3

16:30-07:45

2 stops24h 15m

$1,418

MelbourneChicago

MEL - ORD

MELORD

Melbourne

Mon 3/11

12:10-22:59

2 stops27h 49m

Chicago O'Hare Intl

Tue 11/11

13:00-10:55

2 stops28h 55m

$1,485

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 4/11

09:55-18:50

2 stops25h 55m

Chicago O'Hare Intl

Tue 11/11

13:00-08:45

2 stops26h 45m

$1,496

BrisbaneChicago

BNE - ORD

BNEORD

Brisbane

Tue 14/10

23:55-14:25

1 stop29h 30m

Chicago O'Hare Intl

Mon 20/10

16:00-22:25

1 stop39h 25m

$1,678

BrisbaneChicago

BNE - ORD

BNEORD

Brisbane

Mon 3/11

12:10-12:55

1 stop40h 45m

Chicago O'Hare Intl

Mon 10/11

14:35-23:00

1 stop40h 25m

$1,679

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 29/11

11:20-23:42

1 stop29h 22m

Lambert-St Louis

Thu 11/12

06:55-07:25

1 stop31h 30m

$2,628

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 30/11

11:20-23:59

1 stop29h 39m

Lambert-St Louis

Mon 15/12

06:55-09:00

1 stop33h 05m

$2,957

Flights are sorted by cheapest return 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?

In general, March is the cheapest month to fly from Australia to Illinois. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,123. If you’re not able to fly to Illinois in March, then February is your next best option. Flight prices from Australia to Illinois during February average around $1,127.

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

On average, the least expensive day to fly to Illinois from Australia is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $1,701. However, this price may fluctuate depending on the airline, the season, and holidays. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $2,003. These prices are subject to change though, so be sure to set up a Price Alert for flights to Illinois.

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

According to our data, the cheapest time of day to fly to Illinois is in the afternoon. momondo users have found flights departing from Australia to Illinois in the afternoon for as low as $1,698. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Illinois are more costly in the morning, with an average ticket price of $1,879. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 $1,480 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Australia for as low as $1,176 on momondo.

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 are updated daily.
How many operators does momondo search for flights from Australia to Illinois?
As of September 2025, there are 10 operators available to choose from for flights from Australia to Illinois.
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 offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify 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 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.

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 $964	Free cancellation	Rating 7.5 907 reviews	Search Qantas Airways flights
Air New Zealand	PriceFrom $1,164	Free cancellation	Rating 8.0 506 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $1,171	Free cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Air Canada	PriceFrom $1,184	Free cancellation	Rating 7.1 10,000 reviews	Search Air Canada flights
United Airlines	PriceFrom $1,352	Free cancellation	Rating 7.4 8,923 reviews	Search United Airlines flights
Cathay Pacific	PriceFrom $1,474	Free cancellation	Rating 7.6 1,006 reviews	Search Cathay Pacific flights
ANA	PriceFrom $1,592	Free cancellation	Rating 8.4 967 reviews	Search ANA flights
Japan Airlines	PriceFrom $1,960	Free cancellation	Rating 8.3 1,560 reviews	Search Japan Airlines flights
Virgin Australia	PriceFrom $2,183	Free cancellation	Rating 7.5 416 reviews	Search Virgin Australia flights
Qatar Airways	PriceFrom $2,473	Free cancellation	Rating 7.4 3,625 reviews	Search Qatar Airways flights

Why use momondo?

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

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

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

Yes. All flights to Illinois from Australia on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Australia 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 help filter your options to help you make an informed choice when booking flights to Illinois from Australia.

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

Of course. momondo tracks the price of Australia to Illinois flights. All you need is a valid email address and we will do the rest; it is that quick and easy.