How long is the flight from Illinois to Australia?

The flight from Illinois to Australia depends on which airports you’re departing from and arriving to, and whether or not you have a layover. If you fly from Chicago (a popular airport in Illinois) to Sydney (the most popular airport in Australia), then the flight time is 23h 16m on average. If you fly from Peoria (another popular airport in Illinois) to Sydney, then the average flight time is 26h 55m.

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

Fiji Airways, United Airlines, and Qantas Airways are the most popular carriers operating from Illinois to Australia

When did momondo last update prices for flights from Illinois to Australia?

Prices for flights from Illinois to Australia refresh daily.

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

As of September 2025, there are 3 operators available to choose from for flights from Illinois to Australia.

How old do you have to be to fly from Illinois to Australia?

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 Illinois to Australia.

What documentation or ID do you need to fly to Australia?

The travel and health documents required for your trip to Australia 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 Australia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$755 Cheap Flights from Illinois to Australia in 2025/26

1 adult

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Find the cheapest flights from Illinois to Australia

Round-trip

One-way

Last minute

Cheap return flights

15:59 - 15:35STL-MEL

30h 36m2 stops

12:00 - 23:42MEL-STL

28h 42m1 stop

$1,435Qantas Airways

Find Deal

Wed, 5 Nov - Wed, 12 Nov

06:00 - 09:30STL-MEL

34h 30m1 stop

06:45 - 23:08MEL-STL

33h 23m2 stops

$1,448Qantas Airways

Find Deal

Wed, 4 Feb - Thu, 26 Feb

12:23 - 09:00ORD-SYD

28h 37m2 stops

14:05 - 00:11SYD-ORD

27h 06m2 stops

$1,594Multiple Airlines

Find Deal

Mon, 27 Oct - Sun, 9 Nov

16:45 - 12:30ORD-SYD

26h 45m2 stops

14:10 - 19:18SYD-ORD

22h 08m2 stops

$1,671Fiji Airways

Find Deal

Sat, 7 Feb - Sat, 28 Feb

14:00 - 19:45ORD-SYD

36h 45m2 stops

21:40 - 13:04SYD-ORD

32h 24m2 stops

$1,708Hawaiian Airlines

Find Deal

Tue, 10 Feb - Fri, 27 Feb

07:00 - 09:00STL-SYD

34h 00m2 stops

11:20 - 23:59SYD-STL

29h 39m2 stops

$1,708Multiple Airlines

Find Deal

Wed, 29 Oct - Thu, 13 Nov

16:25 - 10:30ORD-SYD

25h 05m1 stop

12:25 - 05:16SYD-ORD

33h 51m2 stops

$1,727ANA

Find Deal

Tue, 11 Nov - Tue, 18 Nov

16:25 - 20:15ORD-SYD

34h 50m1 stop

12:25 - 08:54SYD-ORD

37h 29m2 stops

$1,739ANA

Find Deal

Mon, 16 Feb - Sun, 1 Mar

14:00 - 19:45ORD-SYD

36h 45m2 stops

21:40 - 13:04SYD-ORD

32h 24m2 stops

$1,743Hawaiian Airlines

Find Deal

Mon, 12 Jan - Mon, 26 Jan

17:49 - 12:30STL-SYD

25h 41m2 stops

14:10 - 23:08SYD-STL

25h 58m2 stops

$1,761Fiji Airways

Find Deal

Tue, 17 Feb - Sun, 1 Mar

Fiji Airways flights from Illinois to Australia

Our best Fiji Airways deals on Illinois to Australia flight tickets

Fiji Airways

7 Feb

ORD16:45Chicago O'Hare Intl

26h 45m

2 stops

SYD12:30Sydney Kingsford Smith

28 Feb

SYD14:10Sydney Kingsford Smith

22h 08m

2 stops

ORD19:18Chicago O'Hare Intl

$1,671

Find similar

Fiji Airways

17 Feb

STL17:49Lambert-St Louis

25h 41m

2 stops

SYD12:30Sydney Kingsford Smith

1 Mar

SYD14:10Sydney Kingsford Smith

25h 58m

2 stops

STL23:08Lambert-St Louis

$1,761

Find similar

Fiji Airways

14 Feb

STL17:49Lambert-St Louis

25h 41m

2 stops

SYD12:30Sydney Kingsford Smith

28 Feb

SYD14:10Sydney Kingsford Smith

25h 58m

2 stops

STL23:08Lambert-St Louis

$1,777

Find similar

Hawaiian Airlines flights from Illinois to Australia

Our best Hawaiian Airlines deals on Illinois to Australia flight tickets

Hawaiian Airlines

10 Feb

ORD14:00Chicago O'Hare Intl

36h 45m

2 stops

SYD19:45Sydney Kingsford Smith

27 Feb

SYD21:40Sydney Kingsford Smith

32h 24m

2 stops

ORD13:04Chicago O'Hare Intl

$1,708

Find similar

Hawaiian Airlines

12 Jan

ORD14:00Chicago O'Hare Intl

36h 45m

2 stops

SYD19:45Sydney Kingsford Smith

26 Jan

SYD21:40Sydney Kingsford Smith

32h 24m

2 stops

ORD13:04Chicago O'Hare Intl

$1,743

Find similar

Hawaiian Airlines

21 Oct

ORD15:15Chicago O'Hare Intl

36h 30m

2 stops

SYD19:45Sydney Kingsford Smith

28 Oct

SYD21:40Sydney Kingsford Smith

34h 50m

2 stops

ORD16:30Chicago O'Hare Intl

$1,767

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Wed 5/11

15:59-15:35

2 stops30h 36m

Melbourne

Wed 12/11

12:00-23:42

1 stop28h 42m

$1,435

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Wed 4/2

06:00-09:30

1 stop34h 30m

Melbourne

Thu 26/2

06:45-23:08

2 stops33h 23m

$1,448

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 27/10

12:23-09:00

2 stops28h 37m

Sydney Kingsford Smith

Sun 9/11

14:05-00:11

2 stops27h 06m

$1,594

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 7/2

16:45-12:30

2 stops26h 45m

Sydney Kingsford Smith

Sat 28/2

14:10-19:18

2 stops22h 08m

$1,671

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 10/2

14:00-19:45

2 stops36h 45m

Sydney Kingsford Smith

Fri 27/2

21:40-13:04

2 stops32h 24m

$1,708

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 29/10

07:00-09:00

2 stops34h 00m

Sydney Kingsford Smith

Thu 13/11

11:20-23:59

2 stops29h 39m

$1,708

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 11/11

16:25-10:30

1 stop25h 05m

Sydney Kingsford Smith

Tue 18/11

12:25-05:16

2 stops33h 51m

$1,727

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 16/2

16:25-20:15

1 stop34h 50m

Sydney Kingsford Smith

Sun 1/3

12:25-08:54

2 stops37h 29m

$1,739

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 12/1

14:00-19:45

2 stops36h 45m

Sydney Kingsford Smith

Mon 26/1

21:40-13:04

2 stops32h 24m

$1,743

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 17/2

17:49-12:30

2 stops25h 41m

Sydney Kingsford Smith

Sun 1/3

14:10-23:08

2 stops25h 58m

$1,761

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 Illinois to Australia

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 Australia?

In general, August is the cheapest month to fly from Illinois to Australia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,291. If you don’t want to visit Australia in August, then you should wait until May to fly from Illinois, when ticket prices are also cheap, with an average price of $1,315.

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

On average, the least expensive day to fly to Australia from Illinois is on a Friday. momondo users have found tickets for Friday departures for as low as $1,396. However, this price may fluctuate depending on the airline, the season, and holidays. Flights from Illinois to Australia on a Thursday will generally be more expensive and average around $3,729. 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 Australia?

According to our data, the cheapest time of day to fly to Australia is in the afternoon. momondo users have found flights departing from Illinois to Australia in the afternoon for as low as $1,789. 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 Australia are more costly in the evening, with an average ticket price of $2,458. Departure times in the evening 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 Australia?

You are more likely to see cheaper flights to Australia from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Australia for around $1,681 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from Illinois for as low as $1,303 on momondo.

Can stopping save me money on Illinois to Australia flights?

You could potentially save up to 15% on your flight if you consider stops on a Illinois to Australia flight.

Cheap Illinois to Australia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Australia

Direct flights	None

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

Search flight deals

When did momondo last update prices for flights from Illinois to Australia?
Prices for flights from Illinois to Australia refresh daily.
How many operators does momondo search for flights from Illinois to Australia?
As of September 2025, there are 3 operators available to choose from for flights from Illinois to Australia.
How old do you have to be to fly from Illinois to Australia?
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 Illinois to Australia.
What documentation or ID do you need to fly to Australia?
The travel and health documents required for your trip to Australia 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 Australia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Illinois to Australia

Compare and see reviews for airlines that fly from Illinois to Australia with momondo

Airline	Rating	Free cancellation	Price
Air Canada	PriceFrom $1,261	Free cancellation	Rating 7.1 10,000 reviews		Search Air Canada flights
Qantas Airways	PriceFrom $1,316	Free cancellation	Rating 7.5 908 reviews		Search Qantas Airways flights

Why use momondo?

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

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

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

Flights from Illinois to Australia with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Illinois to Australia?

momondo provides multiple filters to help you find the best flight to Australia from Illinois. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are simply researching potential flights to Australia, momondo offers a useful price alert feature which will track prices for flights to Australia from Illinois and alert you when they change.