HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Australia

$453+ 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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Australia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$892
(Mytrip)

One-way from

$453
(CheapTickets)

Popular in

December

Cheapest in

August

Average price

$877
Provider with most accurate pricing for Chicago (CHI)-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Sydney Kingsford Smith flights.
Search Deals
From Illinois to Australia
Search Deals
One-way flight from Illinois to Australia
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($158 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 April 17, 2025.

This Mytrip deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/311:53 amORD - MEL
2 stops33h 22mMultiple Airlines
Sat 5/1012:55 pmMEL - ORD
3 stops32h 47mMultiple Airlines
Deal found 4/17$892
This Justfly.com deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/252:25 pmORD - BNE
1 stop24h 05mQantas Airways
Thu 12/257:25 pmBNE - ORD
1 stop19h 45mQantas Airways
Deal found 4/17$900
This American Airlines deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/252:50 pmORD - BNE
2 stops23h 40mAmerican Airlines
Thu 12/257:25 pmBNE - ORD
1 stop26h 45mAmerican Airlines
Deal found 4/17$941
This Trip.com deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/318:00 amMDW - SYD
2 stops36h 45mMultiple Airlines
Sat 6/71:45 pmSYD - MDW
2 stops38h 44mMultiple Airlines
Deal found 4/16$955
This CheapTickets deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/54:00 pmORD - PER
2 stops39h 40mMultiple Airlines
Tue 5/209:55 pmPER - ORD
2 stops53h 30mMultiple Airlines
Deal found 4/17$1,050
This Mytrip deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2911:53 amORD - SYD
2 stops32h 52mMultiple Airlines
Sat 5/101:45 pmSYD - ORD
3 stops31h 57mMultiple Airlines
Deal found 4/17$1,070
This Cheapflightsfares deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/11:30 pmORD - SYD
2 stops28h 20mQantas Airways
Sun 11/167:05 amSYD - ORD
2 stops29h 15mQantas Airways
Deal found 4/17$1,102
This StudentUniverse deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/216:50 pmORD - SYD
2 stops25h 55mFiji Airways
Sat 11/12:30 pmSYD - ORD
2 stops22h 19mFiji Airways
Deal found 4/17$1,125
This Mytrip deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/69:30 amORD - BNE
3 stops46h 20mMultiple Airlines
Mon 5/126:30 amBNE - ORD
3 stops39h 12mMultiple Airlines
Deal found 4/17$1,142
This StudentUniverse deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/283:51 pmORD - SYD
2 stops24h 54mAir New Zealand
Wed 11/191:55 pmSYD - ORD
2 stops23h 27mAir New Zealand
Deal found 4/17$1,185
This Cheapflightsfares deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/127:40 pmORD - SYD
2 stops32h 35mANA
Tue 8/268:55 pmSYD - ORD
1 stop26h 45mANA
Deal found 4/17$1,191
This oojo deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/107:19 pmSTL - SYD
2 stops25h 26mFiji Airways
Sat 5/171:45 pmSYD - STL
2 stops24h 00mFiji Airways
Deal found 4/16$1,229

Cheapflights Fare Finder

Customize your flight search to find flights from Illinois to Australia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 17, 2025.
Use the filters below to find and compare flights from Illinois to Australia that are best for you.

Fly from

Illinois

Fly to

Australia

Route

Depart

Return

Price

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Sat 5/3

11:53 am-12:15 pm

2 stops33h 22m

Melbourne

Sat 5/10

12:55 pm-6:42 am

3 stops32h 47m

$892

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Sat 5/31

8:00 am-11:45 am

2 stops36h 45m

Sydney Kingsford Smith

Sat 6/7

1:45 pm-1:29 pm

2 stops38h 44m

$955

ChicagoPerth

ORD - PER

ORDPER

Chicago O'Hare Intl

Mon 5/5

4:00 pm-8:40 pm

2 stops39h 40m

Perth

Tue 5/20

9:55 pm-2:25 pm

2 stops53h 30m

$1,050

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 4/29

11:53 am-11:45 am

2 stops32h 52m

Sydney Kingsford Smith

Sat 5/10

1:45 pm-6:42 am

3 stops31h 57m

$1,070

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 5/10

7:19 pm-11:45 am

2 stops25h 26m

Sydney Kingsford Smith

Sat 5/17

1:45 pm-10:45 pm

2 stops24h 00m

$1,229

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 9/10

1:30 pm-7:20 am

2 stops50h 50m

Sydney Kingsford Smith

Tue 9/30

9:20 am-7:57 pm

2 stops49h 37m

$1,252

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 5/10

6:45 pm-11:45 am

2 stops26h 00m

Sydney Kingsford Smith

Sat 5/17

1:45 pm-8:24 pm

2 stops21h 39m

$1,258

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/11

5:41 pm-8:45 am

2 stops24h 04m

Sydney Kingsford Smith

Mon 8/18

8:45 am-4:46 pm

2 stops47h 01m

$1,262

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 7/1

3:54 pm-9:40 pm

2 stops38h 46m

Sydney Kingsford Smith

Wed 7/9

11:50 am-11:59 pm

2 stops27h 09m

$1,272

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Mon 6/23

9:12 am-6:45 am

1 stop30h 33m

Melbourne

Wed 7/16

3:05 pm-9:02 pm

1 stop20h 57m

$1,343

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 60 results
1
2
3
...
6

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 $1,046). Flying from Illinois to Australia in December is currently the most expensive (average of $1,643). 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?

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 April 17, 2025.

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.

Rainfall in Australia by month

Plan your trip to Australia by taking into account the average rainfall totals by month.

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.

Temperature in Australia by month

Plan your trip to Australia by taking into account the average temperature totals by month.

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).

Reviews of airlines servicing Australia

Get insights into the airlines that provide service to Australia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Australia. Reviews last updated April 17, 2025.
Read reviews from past customers who have flown Air Tahiti Nui, EVA Air and Korean Air from Illinois to Australia. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Tahiti Nui
8.8
Very good
62 reviews

Boarding

8.7

Comfort

8.1

Overall

8.8

Food

7.8

Crew

9.1

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Air Tahiti Nui
8.8
Very good
62 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Boarding

8.7

Comfort

8.1

Overall

8.8

Food

7.8

Crew

9.1

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
EVA Air
8.4
Very good
1,177 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Boarding

8.7

Comfort

8.1

Overall

8.8

Food

7.8

Crew

9.1

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Korean Air
8.4
Very good
1,064 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Boarding

8.7

Comfort

8.1

Overall

8.8

Food

7.8

Crew

9.1

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Japan Airlines
8.3
Very good
1,443 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Boarding

8.7

Comfort

8.1

Overall

8.8

Food

7.8

Crew

9.1

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
ANA
8.3
Very good
845 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Boarding

8.7

Comfort

8.1

Overall

8.8

Food

7.8

Crew

9.1

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

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.

  • What are the cheapest airlines to fly from Illinois to Australia one-way?

    $664 is the cheapest one-way deal found within the past few days, from Fiji Airways. You may also be able to find cheap deals on Alaska Airlines and Qantas Airways, with prices starting from $755 and $781, respectively.

  • 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 $1,046). Flying from Illinois to Australia in December is currently the most expensive (average of $1,643). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Australia

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Sydney flights
Los Angeles to Papeete flights
John F Kennedy Intl to Sydney flights
Los Angeles to Melbourne flights
Dallas/Fort Worth to Sydney flights
San Francisco to Sydney flights
Los Angeles to Auckland flights
Newark to Sydney flights
San Francisco to Auckland flights
Dallas/Fort Worth to Melbourne flights
San Francisco to Melbourne flights
San Francisco to Papeete flights
LaGuardia to Sydney flights
Los Angeles to Brisbane flights
Seattle to Melbourne flights
O'Hare Intl to Sydney flights
Reagan-National to Melbourne flights
Dulles Intl to Melbourne flights
John F Kennedy Intl to Auckland flights
Los Angeles to Nadi flights
John F Kennedy Intl to Melbourne flights
Ontario to Sydney flights
Dulles Intl to Sydney flights
Seattle to Sydney flights
Hobby to Sydney flights
Seattle to Auckland flights
Santa Ana to Sydney flights
Newark to Melbourne flights
Dallas/Fort Worth to Auckland flights
Reagan-National to Sydney flights
San Francisco to Brisbane flights
Boston to Sydney flights
Hobby to Melbourne flights
Newark to Auckland flights
San Francisco to Nadi flights
Honolulu to Sydney flights
San Jose to Papeete flights
Atlanta to Sydney flights
Denver to Sydney flights
Baltimore to Sydney flights
Minneapolis to Sydney flights
LaGuardia to Melbourne flights
Dallas/Fort Worth to Nadi flights
Dallas/Fort Worth to Brisbane flights
Ontario to Papeete flights
Midway to Sydney flights
Los Angeles to Avalon flights
LaGuardia to Auckland flights
Dallas/Fort Worth to Avalon flights
George Bush Intcntl to Sydney flights

Top 10 airlines flying from Illinois to Australia

Discover the top 10 airlines that operate flights from Illinois to Australia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$630Average$1,197FlexibilityNo cancel feeOn-time74%
ANACheapest$679Average$781FlexibilityNo cancel feeOn-time80%
American AirlinesCheapest$679Average$939FlexibilityNo cancel feeOn-time71%
DeltaCheapest$852Average$967FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$953Average$1,335FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$1,164Average$1,582FlexibilityNo cancel feeOn-time69%
Fiji AirwaysCheapest$1,217Average$1,398FlexibilityNo cancel feeOn-time74%
Air New ZealandCheapest$1,256Average$1,704FlexibilityNo cancel feeOn-time78%
Cathay PacificCheapest$1,305Average$1,517FlexibilityNo cancel feeOn-time72%
Singapore AirlinesCheapest$1,421Average$1,706FlexibilityNo cancel feeOn-time81%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.