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$425+ 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 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
Apr 6 — Apr 131
Sun 4/6
Sun 4/13
1 adult, Economy
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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 April 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$916
(American Airlines)

One-way from

$425
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$1,125
Provider with most accurate pricing for Chicago (CHI)-Sydney Kingsford Smith flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Sydney Kingsford Smith flights.
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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. 12% potential increase in price ($155 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($40 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 1, 2025.

This Justfly.com deal was found by Cheapflights users on 3/31. 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 3/31$899
This American Airlines deal was found by Cheapflights users on 3/30. 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 5/133:15 pmORD - BNE
1 stop23h 10mAmerican Airlines
Tue 5/208:05 pmBNE - ORD
1 stop24h 05mAmerican Airlines
Deal found 3/30$916
This Flighttix deal was found by Cheapflights users on 3/31. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1510:34 amORD - BNE
2 stops27h 51mBritish Airways
Thu 5/228:05 pmBNE - ORD
2 stops25h 02mBritish Airways
Deal found 3/31$920
This Trip.com deal was found by Cheapflights users on 3/31. 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.
Thu 5/157:00 amORD - CNS
2 stops37h 25mMultiple Airlines
Thu 5/2212:25 pmCNS - ORD
2 stops38h 42mMultiple Airlines
Deal found 3/31$983
This Mytrip deal was found by Cheapflights users on 3/31. 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
2 stops32h 47mMultiple Airlines
Deal found 3/31$995
This Mytrip deal was found by Cheapflights users on 3/31. 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 - ADL
2 stops33h 12mMultiple Airlines
Sat 5/1012:35 pmADL - ORD
2 stops32h 37mMultiple Airlines
Deal found 3/31$1,032
This Mytrip deal was found by Cheapflights users on 3/31. 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.
Thu 4/311:45 amORD - SYD
3 stops33h 30mMultiple Airlines
Wed 4/301:15 pmSYD - ORD
2 stops31h 30mMultiple Airlines
Deal found 3/31$1,033
This Air Canada deal was found by Cheapflights users on 3/30. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/113:35 pmORD - SYD
1 stop24h 45mAir Canada
Tue 5/279:20 amSYD - ORD
2 stops37h 39mAir Canada
Deal found 3/30$1,034
This Mytrip deal was found by Cheapflights users on 3/31. 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.
Thu 5/1511:45 amORD - BNE
3 stops31h 35mMultiple Airlines
Thu 5/2211:40 amBNE - ORD
2 stops34h 02mMultiple Airlines
Deal found 3/31$1,077
This Cheapflightsfares deal was found by Cheapflights users on 3/31. 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 11/12:45 pmORD - SYD
2 stops27h 05mQantas Airways
Sun 11/167:05 amSYD - ORD
2 stops27h 26mQantas Airways
Deal found 3/31$1,101
This Gotogate deal was found by Cheapflights users on 3/31. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/136:45 pmORD - BNE
2 stops24h 50mFiji Airways
Tue 5/2011:40 amBNE - ORD
2 stops23h 44mFiji Airways
Deal found 3/31$1,185
This Air Canada deal was found by Cheapflights users on 3/31. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/223:40 pmORD - MEL
2 stops28h 25mAir Canada
Wed 11/128:10 amMEL - ORD
2 stops23h 29mAir Canada
Deal found 3/31$1,191

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 1, 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

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Tue 5/13

3:15 pm-5:25 am

1 stop23h 10m

Brisbane

Tue 5/20

8:05 pm-5:10 am

1 stop24h 05m

$916

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Thu 5/15

10:34 am-5:25 am

2 stops27h 51m

Brisbane

Thu 5/22

8:05 pm-6:07 am

2 stops25h 02m

$920

ChicagoCairns

ORD - CNS

ORDCNS

Chicago O'Hare Intl

Thu 5/15

7:00 am-11:25 am

2 stops37h 25m

Cairns

Thu 5/22

12:25 pm-12:07 pm

2 stops38h 42m

$983

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

2 stops32h 47m

$995

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Sat 5/3

11:53 am-11:35 am

2 stops33h 12m

Adelaide

Sat 5/10

12:35 pm-6:42 am

2 stops32h 37m

$1,032

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 5/11

8:45 am-7:20 am

2 stops31h 35m

Sydney Kingsford Smith

Tue 5/27

9:20 am-7:59 am

2 stops37h 39m

$1,034

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Thu 5/15

11:45 am-10:20 am

3 stops31h 35m

Brisbane

Thu 5/22

11:40 am-6:42 am

2 stops34h 02m

$1,077

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Tue 5/13

6:45 pm-10:35 am

2 stops24h 50m

Brisbane

Tue 5/20

11:40 am-8:24 pm

2 stops23h 44m

$1,185

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Sun 5/25

3:35 pm-12:20 pm

2 stops29h 45m

Melbourne

Tue 6/3

6:00 am-2:43 pm

2 stops23h 43m

$1,192

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

$1,197

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 60 results
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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 1, 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 1, 2025.
Read reviews from past customers who have flown Air Tahiti Nui, Japan Airlines and ANA 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
8.7
Very good
61 reviews

Boarding

8.7

Overall

8.7

Entertainment

7.2

Crew

9.1

Food

7.8

Comfort

8.0

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
8.7
Very good
61 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Boarding

8.7

Overall

8.7

Entertainment

7.2

Crew

9.1

Food

7.8

Comfort

8.0

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
1,440 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Boarding

8.7

Overall

8.7

Entertainment

7.2

Crew

9.1

Food

7.8

Comfort

8.0

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
831 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Boarding

8.7

Overall

8.7

Entertainment

7.2

Crew

9.1

Food

7.8

Comfort

8.0

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.
Singapore Airlines
8.1
Very good
1,286 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Boarding

8.7

Overall

8.7

Entertainment

7.2

Crew

9.1

Food

7.8

Comfort

8.0

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.
Fiji Airways
8.0
Very good
180 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Boarding

8.7

Overall

8.7

Entertainment

7.2

Crew

9.1

Food

7.8

Comfort

8.0

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?

    $667 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 ANA and Alaska Airlines, with prices starting from $700 and $711, 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

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Alternative routes for Illinois to Australia

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Top 9 airlines flying from Illinois to Australia

Discover the top 9 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 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$647Average$1,199FlexibilityNo cancel feeOn-time74%
ANACheapest$679Average$781FlexibilityNo cancel feeOn-time80%
American AirlinesCheapest$679Average$939FlexibilityNo cancel feeOn-time71%
DeltaCheapest$852Average$1,252FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$953Average$1,375FlexibilityNo cancel feeOn-time67%
Cathay PacificCheapest$1,138Average$1,409FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$1,164Average$1,588FlexibilityNo cancel feeOn-time69%
Air New ZealandCheapest$1,179Average$1,570FlexibilityNo cancel feeOn-time78%
Singapore AirlinesCheapest$1,421Average$1,706FlexibilityNo cancel feeOn-time81%
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