In terms of precipitation, rainfall in Australia ranges from 2.0 - 5.1 inches per month. March is typically the wettest month, when rainfall can reach 5.1 in. September is typically the driest time to visit Australia when rainfall is around 2.0 in.

If weather is an important factor for your trip to Australia, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 51.8 F).

What is the cheapest month to fly from Illinois to Australia?

Flights from Illinois to Australia lean towards being more expensive in December. Prices are generally better when you fly from Illinois to Australia in August, with the cheapest ticket starting at $743.

Can I find deals for flights from Illinois to Australia that include hotel bookings?

Yes. In addition to deals on Illinois to Australia flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Illinois to Australia?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Australia.

Can I find deals for business class flights from Illinois to Australia?

Yes. Cheapflights offers flight deals from Illinois to Australia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$468+ Flights from Illinois to Australia

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Cheap flight deals from Illinois to Australia

Round-trip from	$835 (Air Canada)
One-way from	$468 (Trip.com)
Popular in	December
Cheapest in	August
Average price	$857

From Illinois to Australia

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One-way flight from Illinois to Australia

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Highest demand for flights based on searches. 15% potential increase in price ($181 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($39 potential savings vs. average RT price).

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Average for round-trip flights in August 2025

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Find flight deals from Illinois to Australia

Cheapest flights from Illinois to Australia
Explore the most affordable flight options available from Illinois to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 13, 2025.

mar. 11/113:40 pmORD - SYD

1 stop24h 55mAir Canada

mié. 11/1911:20 amSYD - ORD

1 stop22h 24mAir Canada

Deal found 8/12

$835

dom. 11/97:15 amORD - SYD

3 stops33h 20mAir Canada

mar. 11/1811:20 amSYD - ORD

2 stops37h 40mAir Canada

Deal found 8/12

$842

lun. 8/253:40 pmORD - MEL

2 stops29h 40mAir Canada

sáb. 9/207:40 pmMEL - ORD

2 stops34h 20mAir Canada

Deal found 8/10

$874

mar. 10/218:40 amORD - SYD

2 stops31h 40mAir Canada

vie. 10/3110:20 amSYD - ORD

1 stop20h 21mAir Canada

Deal found 8/11

$898

sáb. 10/184:05 pmSTL - SYD

2 stops48h 15mAir Canada

mar. 10/2810:20 amSYD - STL

2 stops45h 09mAir Canada

Deal found 8/10

$898

sáb. 10/2510:40 amORD - SYD

2 stops29h 55mAir Canada

lun. 11/311:20 amSYD - ORD

2 stops37h 40mAir Canada

Deal found 8/11

$900

lun. 11/173:40 pmORD - MEL

2 stops30h 55mAir Canada

dom. 11/306:50 pmMEL - ORD

2 stops36h 51mAir Canada

Deal found 8/10

$912

mar. 11/48:45 amORD - SYD

2 stops31h 50mAir Canada

mar. 11/1111:20 amSYD - ORD

1 stop20h 21mAir Canada

Deal found 8/11

$935

mié. 11/54:25 pmORD - PER

2 stops34h 10mMultiple Airlines

mié. 11/125:50 pmPER - ORD

2 stops34h 00mMultiple Airlines

Deal found 8/11

$951

sáb. 10/253:40 pmORD - SYD

1 stop24h 55mAir Canada

vie. 11/711:20 amSYD - ORD

1 stop22h 24mAir Canada

Deal found 8/11

$960

mié. 11/54:05 pmSTL - SYD

2 stops48h 30mAir Canada

mié. 11/1911:20 amSYD - STL

2 stops45h 09mAir Canada

Deal found 8/12

$962

lun. 10/273:40 pmORD - MEL

2 stops28h 55mAir Canada

dom. 11/98:10 amMEL - ORD

2 stops23h 31mAir Canada

Deal found 8/10

$970

Best flights from Illinois to Australia
Discover carefully curated flight deals from Illinois to Australia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated agosto 13, 2025.

dom. 11/93:40 pmORD - SYD

1 stop24h 55mAir Canada

mar. 11/1811:20 amSYD - ORD

2 stops37h 40mAir Canada

Deal found 8/11

$835

mié. 11/54:25 pmORD - PER

2 stops34h 10mMultiple Airlines

mié. 11/125:50 pmPER - ORD

2 stops34h 00mMultiple Airlines

Deal found 8/11

$951

vie. 11/284:07 pmSTL - SYD

1 stop21h 48mQantas Airways

dom. 12/146:05 amSYD - STL

2 stops27h 02mQantas Airways

Deal found 8/10

$1,092

lun. 9/227:16 amSTL - MEL

1 stop30h 44mAmerican Airlines

lun. 9/293:05 pmMEL - STL

1 stop22h 45mAmerican Airlines

Deal found 8/12

$1,261

lun. 8/254:00 pmORD - PER

1 stop26h 45mCathay Pacific

dom. 9/712:10 amPER - ORD

1 stop27h 15mCathay Pacific

Deal found 8/12

$1,306

lun. 1/261:00 pmMDW - MEL

2 stops26h 00mDelta

dom. 2/810:10 amMEL - MDW

2 stops28h 36mDelta

Deal found 8/11

$1,465

lun. 2/93:40 pmORD - MEL

2 stops29h 35mAir Canada

dom. 2/227:10 amMEL - ORD

2 stops24h 31mAir Canada

Deal found 8/11

$870

dom. 2/12:00 pmORD - MEL

3 stops30h 35mAir Canada

mié. 4/16:40 amMEL - ORD

2 stops24h 03mAir Canada

Deal found 8/12

$876

dom. 11/22:40 pmORD - PER

2 stops47h 40mMultiple Airlines

lun. 11/105:35 amPER - ORD

2 stops45h 25mMultiple Airlines

Deal found 8/11

$990

mié. 1/141:00 pmORD - MEL

2 stops33h 35mAir Canada

mié. 1/218:10 amMEL - ORD

2 stops25h 28mAir Canada

Deal found 8/11

$878

vie. 2/64:07 pmSTL - SYD

1 stop21h 48mQantas Airways

dom. 2/157:05 amSYD - STL

2 stops23h 53mQantas Airways

Deal found 8/10

$1,092

lun. 2/23:40 pmORD - MEL

2 stops30h 35mAir Canada

dom. 2/158:00 amMEL - ORD

3 stops28h 30mAir Canada

Deal found 8/11

$880

Last-minute flights from Illinois to Australia
Discover last-minute flight deals from Illinois to Australia. Data last updated agosto 13, 2025 and is based on user searches.

mar. 8/193:40 pmORD - SYD

1 stop24h 40mAir Canada

mar. 9/309:20 amSYD - ORD

1 stop20h 40mAir Canada

Deal found 8/11

$1,035

mar. 8/196:20 pmORD - SYD

2 stops26h 25mFiji Airways

mar. 8/261:15 pmSYD - ORD

2 stops22h 42mFiji Airways

Deal found 8/12

$1,271

mar. 8/1911:25 amORD - SYD

2 stops40h 35mTurkish Airlines

mar. 9/308:55 pmSYD - ORD

2 stops36h 00mTurkish Airlines

Deal found 8/11

$1,334

mar. 8/196:20 pmORD - SYD

2 stops26h 25mFiji Airways

sáb. 8/301:45 pmSYD - ORD

2 stops22h 12mFiji Airways

Deal found 8/12

$1,353

mar. 8/194:00 pmORD - SYD

1 stop27h 50mCathay Pacific

mar. 9/309:50 pmSYD - ORD

1 stop31h 35mCathay Pacific

Deal found 8/11

$1,381

mar. 8/1910:31 amMDW - SYD

2 stops29h 04mDelta

sáb. 8/309:25 amSYD - MDW

2 stops24h 12mDelta

Deal found 8/11

$2,166

vie. 8/2212:30 amORD - MEL

2 stops30h 45mMultiple Airlines

mar. 8/2611:55 pmMEL - ORD

3 stops44h 45mMultiple Airlines

Deal found 8/10

$2,085

sáb. 8/237:09 pmORD - SYD

2 stops25h 36mMultiple Airlines

sáb. 8/301:45 pmSYD - ORD

2 stops30h 55mMultiple Airlines

Deal found 8/11

$1,202

sáb. 8/235:30 pmSTL - SYD

2 stops46h 05mDelta

mié. 8/279:25 amSYD - STL

2 stops23h 22mDelta

Deal found 8/12

$1,299

sáb. 8/2312:20 pmSTL - SYD

1 stop27h 35mAmerican Airlines

lun. 9/112:10 pmSYD - STL

1 stop22h 19mAmerican Airlines

Deal found 8/12

$1,345

sáb. 8/234:40 pmSTL - SYD

2 stops23h 20mUnited Airlines

mié. 8/2710:20 amSYD - STL

1 stop21h 33mUnited Airlines

Deal found 8/11

$1,545

sáb. 8/236:45 amSTL - SYD

2 stops34h 55mCathay Pacific

lun. 9/111:30 amSYD - STL

3 stops50h 44mCathay Pacific

Deal found 8/11

$2,072

One-way flights from Illinois to Australia
Search for one-way flight options from Illinois to Australia. Find affordable one-way fares based on user searches. Data last updated agosto 13, 2025.

sáb. 9/132:07 pmORD - MEL

3 stops36h 38mMultiple Airlines

Deal found 8/12

$468

mar. 9/3010:00 amORD - SYD

2 stops30h 05mMultiple Airlines

Deal found 8/11

$508

mar. 9/94:00 pmORD - PER

2 stops44h 40mMultiple Airlines

Deal found 8/9

$512

mar. 9/233:20 pmORD - SYD

2 stops32h 20mMultiple Airlines

Deal found 8/13

$528

sáb. 9/132:07 pmORD - AVV

3 stops41h 43mMultiple Airlines

Deal found 8/12

$529

sáb. 10/48:00 amORD - SYD

2 stops56h 05mMultiple Airlines

Deal found 8/11

$534

lun. 9/84:00 pmORD - PER

2 stops39h 40mMultiple Airlines

Deal found 8/9

$545

lun. 9/87:09 pmORD - SYD

2 stops52h 31mMultiple Airlines

Deal found 8/11

$547

sáb. 9/202:07 pmORD - BNE

3 stops40h 23mMultiple Airlines

Deal found 8/10

$555

sáb. 9/611:45 pmORD - PER

3 stops55h 55mMultiple Airlines

Deal found 8/10

$563

lun. 11/248:00 amORD - SYD

2 stops30h 25mMultiple Airlines

Deal found 8/11

$573

mié. 8/204:00 pmORD - MEL

2 stops47h 00mMultiple Airlines

Deal found 8/13

$578

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

dom. 11/9

3:40 pm-9:35 am

1 stop24h 55m

Sydney Kingsford Smith

mar. 11/18

11:20 am-8:00 am

2 stops37h 40m

$835

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

lun. 2/9

3:40 pm-2:15 pm

2 stops29h 35m

Melbourne

dom. 2/22

7:10 am-2:41 pm

2 stops24h 31m

$870

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

dom. 2/1

2:00 pm-1:35 pm

3 stops30h 35m

Melbourne

mié. 4/1

6:40 am-2:43 pm

2 stops24h 03m

$876

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

mié. 1/14

1:00 pm-3:35 pm

2 stops33h 35m

Melbourne

mié. 1/21

8:10 am-4:38 pm

2 stops25h 28m

$878

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

lun. 2/2

3:40 pm-3:15 pm

2 stops30h 35m

Melbourne

dom. 2/15

8:00 am-7:30 pm

3 stops28h 30m

$880

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

mié. 1/21

3:40 pm-3:35 pm

2 stops30h 55m

Melbourne

lun. 2/2

8:00 am-2:41 pm

2 stops23h 41m

$882

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

mié. 1/21

3:40 pm-3:35 pm

2 stops30h 55m

Melbourne

mié. 1/28

7:45 am-7:30 pm

3 stops28h 45m

$889

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

mar. 10/21

8:40 am-8:20 am

2 stops31h 40m

Sydney Kingsford Smith

vie. 10/31

10:20 am-5:10 pm

2 stops22h 50m

$898

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

jue. 10/30

12:50 pm-8:35 am

2 stops27h 45m

Sydney Kingsford Smith

lun. 11/10

11:20 am-2:41 pm

1 stop20h 21m

$898

ChicagoPerth

ORD - PER

ORDPER

Chicago O'Hare Intl

mié. 11/5

4:25 pm-4:35 pm

2 stops34h 10m

Perth

mié. 11/12

5:50 pm-1:50 pm

2 stops34h 00m

$951

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 60 results

...

Best time to book a flight from Illinois to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia from Illinois with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Australia

What is the cheapest month to book a flight from Illinois to Australia?

Currently, February is the cheapest month in which you can book a flight from Illinois to Australia (average of $1,031). Flying from Illinois to Australia in December is currently the most expensive (average of $1,619). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to AU?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Australia as you normally would.

Related info for your journey

Can I find deals for flights from Illinois to Australia that include hotel bookings?
Yes. In addition to deals on Illinois to Australia flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Illinois to Australia?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Australia.
Can I find deals for business class flights from Illinois to Australia?
Yes. Cheapflights offers flight deals from Illinois to Australia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Illinois to Australia?
Currently, February is the cheapest month in which you can book a flight from Illinois to Australia (average of $1,031). Flying from Illinois to Australia in December is currently the most expensive (average of $1,619). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Illinois to Australia flights

Top 10 airlines flying from Illinois to Australia

Airline	Cheapest	Average	Flexibility	On-time
Qantas Airways	Cheapest$647	Average$1,191	FlexibilityNo cancel fee	On-time74%
ANA	Cheapest$679	Average$1,177	FlexibilityNo cancel fee	On-time80%
American Airlines	Cheapest$679	Average$1,294	FlexibilityNo cancel fee	On-time71%
Fiji Airways	Cheapest$772	Average$1,432	FlexibilityNo cancel fee	On-time74%
Delta	Cheapest$853	Average$983	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$876	Average$1,366	FlexibilityNo cancel fee	On-time69%
Air Canada	Cheapest$952	Average$1,305	FlexibilityNo cancel fee	On-time67%
Qatar Airways	Cheapest$1,229	Average$1,477	FlexibilityNo cancel fee	On-time68%
Air New Zealand	Cheapest$1,275	Average$1,501	FlexibilityNo cancel fee	On-time78%
Cathay Pacific	Cheapest$1,470	Average$1,566	FlexibilityNo cancel fee	On-time72%

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$468+ Cheap flights from Illinois to Australia

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/13. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from Illinois to Australia

Keep the following information in mind while searching for Illinois to Australia flight deals. Data was last updated agosto 13, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Illinois to Australia

Cheapest flights from Illinois to AustraliaExplore the most affordable flight options available from Illinois to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 13, 2025.

Explore the most affordable flight options available from Illinois to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 13, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to Australia that are best for you.

Best time to book a flight from Illinois to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia from Illinois with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Australia

What is the cheapest month to book a flight from Illinois to Australia?

What is the cheapest time of day to fly from IL to AU?

Find hourly flight availability from Illinois to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated agosto 13, 2025.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Australia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

Can I find deals for flights from Illinois to Australia that include hotel bookings?

How can I find direct flights from Illinois to Australia?

Can I find deals for business class flights from Illinois to Australia?

What is the cheapest month to book a flight from Illinois to Australia?

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Alternative routes for Illinois to Australia

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from Illinois to Australia

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Cheapest flights from Illinois to Australia
Explore the most affordable flight options available from Illinois to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 13, 2025.