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$454+ 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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$1,045
(Trip.com)

One-way from

$454
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$925
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. 14% potential increase in price ($182 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($44 potential savings vs. average RT price).
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Average for round-trip flights in June 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 junio 12, 2025.

This Trip.com deal was found by Cheapflights users on 6/12. 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.
mié. 7/27:42 amORD - SYD
1 stop32h 48mMultiple Airlines
jue. 7/175:45 pmSYD - ORD
2 stops27h 18mMultiple Airlines
Deal found 6/12$1,045
This oojo deal was found by Cheapflights users on 6/12. 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.
vie. 11/286:15 amSTL - SYD
2 stops47h 10mQantas Airways
dom. 12/142:20 pmSYD - STL
1 stop18h 47mQantas Airways
Deal found 6/12$1,077
This FlightHub deal was found by Cheapflights users on 6/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/126:20 pmORD - BNE
2 stops25h 05mFiji Airways
mar. 8/1911:35 amBNE - ORD
2 stops24h 22mFiji Airways
Deal found 6/11$1,138
This CheapTickets.ch deal was found by Cheapflights users on 6/9. 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.ch is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/17:42 amORD - MEL
2 stops36h 48mMultiple Airlines
lun. 7/141:45 pmMEL - ORD
2 stops30h 40mMultiple Airlines
Deal found 6/9$1,165
This Air Canada deal was found by Cheapflights users on 6/9. 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.
dom. 9/141:30 pmSTL - SYD
2 stops26h 50mMultiple Airlines
sáb. 9/279:20 amSYD - STL
2 stops22h 12mMultiple Airlines
Deal found 6/9$1,169
This Air Canada deal was found by Cheapflights users on 6/11. 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.
mar. 11/259:00 amORD - BNE
2 stops31h 40mAir Canada
jue. 12/2510:45 amBNE - ORD
1 stop19h 54mAir Canada
Deal found 6/11$1,171
This FlightHub deal was found by Cheapflights users on 6/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/141:39 pmSTL - SYD
2 stops26h 41mAir Canada
sáb. 9/279:20 amSYD - STL
2 stops29h 38mAir Canada
Deal found 6/11$1,189
This Trip.com deal was found by Cheapflights users on 6/10. 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.
lun. 7/216:40 amORD - BNE
2 stops36h 55mMultiple Airlines
lun. 7/2811:35 amBNE - ORD
2 stops32h 50mMultiple Airlines
Deal found 6/10$1,202
This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/166:20 pmORD - SYD
2 stops26h 25mFiji Airways
sáb. 8/231:45 pmSYD - ORD
2 stops22h 12mFiji Airways
Deal found 6/10$1,227
This CheapTickets deal was found by Cheapflights users on 6/12. 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.
dom. 7/275:45 pmORD - PER
2 stops45h 45mMultiple Airlines
dom. 8/35:10 amPER - ORD
2 stops46h 45mMultiple Airlines
Deal found 6/12$1,246
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/272:07 pmORD - SYD
2 stops26h 23mAlaska Airlines
mié. 9/35:45 pmSYD - ORD
2 stops28h 18mAlaska Airlines
Deal found 6/10$1,252
This American Airlines deal was found by Cheapflights users on 6/11. 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.
dom. 9/144:02 pmSTL - SYD
1 stop23h 53mAmerican Airlines
sáb. 9/279:10 amSYD - STL
2 stops23h 50mAmerican Airlines
Deal found 6/11$1,259

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 junio 12, 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

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

mié. 7/2

7:42 am-7:30 am

1 stop32h 48m

Sydney Kingsford Smith

jue. 7/17

5:45 pm-6:03 am

2 stops27h 18m

$1,045

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

mar. 8/12

6:20 pm-10:25 am

2 stops25h 05m

Brisbane

mar. 8/19

11:35 am-8:57 pm

2 stops24h 22m

$1,138

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

mar. 7/1

7:42 am-11:30 am

2 stops36h 48m

Melbourne

lun. 7/14

1:45 pm-5:25 am

2 stops30h 40m

$1,165

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

mar. 11/25

9:00 am-8:40 am

2 stops31h 40m

Brisbane

jue. 12/25

10:45 am-2:39 pm

1 stop19h 54m

$1,171

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

lun. 7/21

6:40 am-10:35 am

2 stops36h 55m

Brisbane

lun. 7/28

11:35 am-5:25 am

2 stops32h 50m

$1,202

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

sáb. 8/16

6:20 pm-11:45 am

2 stops26h 25m

Sydney Kingsford Smith

sáb. 8/23

1:45 pm-8:57 pm

2 stops22h 12m

$1,227

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

mié. 8/27

2:07 pm-7:30 am

2 stops26h 23m

Sydney Kingsford Smith

mié. 9/3

5:45 pm-7:03 am

2 stops28h 18m

$1,252

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

mar. 7/29

5:27 pm-6:55 am

1 stop22h 28m

Sydney Kingsford Smith

mar. 8/12

9:10 am-11:09 pm

1 stop28h 59m

$1,270

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

lun. 10/20

3:40 pm-10:50 am

2 stops27h 10m

Melbourne

mar. 10/28

8:35 am-8:25 pm

2 stops27h 50m

$1,273

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

mié. 9/10

5:50 pm-8:45 am

2 stops23h 55m

Sydney Kingsford Smith

mié. 9/24

11:50 am-9:40 pm

2 stops24h 50m

$1,303

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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, March is the cheapest month in which you can book a flight from Illinois to Australia (average of $1,041). Flying from Illinois to Australia in December is currently the most expensive (average of $1,635). 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 junio 12, 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 junio 12, 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
8.7
Very good
64 reviews

Food

7.8

Entertainment

7.3

Overall

8.7

Boarding

8.7

Comfort

8.1

Crew

9.0

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
64 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Food

7.8

Entertainment

7.3

Overall

8.7

Boarding

8.7

Comfort

8.1

Crew

9.0

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.
EVA Air
8.4
Very good
1,202 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Food

7.8

Entertainment

7.3

Overall

8.7

Boarding

8.7

Comfort

8.1

Crew

9.0

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.
Korean Air
8.4
Very good
1,088 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Food

7.8

Entertainment

7.3

Overall

8.7

Boarding

8.7

Comfort

8.1

Crew

9.0

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
1,489 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Food

7.8

Entertainment

7.3

Overall

8.7

Boarding

8.7

Comfort

8.1

Crew

9.0

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
882 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Food

7.8

Entertainment

7.3

Overall

8.7

Boarding

8.7

Comfort

8.1

Crew

9.0

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?

    $674 is the cheapest one-way deal found within the past few days, from Alaska Airlines. You may also be able to find cheap deals on Fiji Airways and Qantas Airways, with prices starting from $690 and $777, 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, March is the cheapest month in which you can book a flight from Illinois to Australia (average of $1,041). Flying from Illinois to Australia in December is currently the most expensive (average of $1,635). 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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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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$647Average$1,266FlexibilityNo cancel feeOn-time74%
ANACheapest$679Average$1,144FlexibilityNo cancel feeOn-time80%
American AirlinesCheapest$679Average$1,128FlexibilityNo cancel feeOn-time71%
Fiji AirwaysCheapest$796Average$1,432FlexibilityNo cancel feeOn-time74%
DeltaCheapest$852Average$965FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$953Average$1,327FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$1,164Average$1,547FlexibilityNo cancel feeOn-time69%
Air New ZealandCheapest$1,275Average$1,506FlexibilityNo cancel feeOn-time78%
Cathay PacificCheapest$1,468Average$1,543FlexibilityNo cancel feeOn-time72%

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