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$454+ Cheap flights from Illinois to Sydney (SYD)

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
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from Illinois to Sydney

Keep the following information in mind while searching for Illinois to Sydney flight deals. Data was last updated June 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 Sydney Kingsford Smith
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One-way flight from Illinois to Sydney Kingsford Smith
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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 Sydney

Cheapest flights from Illinois to Sydney
Explore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 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.
Wed 7/27:42 amORD - SYD
1 stop32h 48mMultiple Airlines
Thu 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.
Fri 11/286:15 amSTL - SYD
2 stops47h 10mQantas Airways
Sun 12/142:20 pmSYD - STL
1 stop18h 47mQantas Airways
Deal found 6/12$1,077
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.
Sun 9/141:30 pmSTL - SYD
2 stops26h 50mMultiple Airlines
Sat 9/279:20 amSYD - STL
2 stops22h 12mMultiple Airlines
Deal found 6/9$1,169
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.
Sun 9/141:39 pmSTL - SYD
2 stops26h 41mAir Canada
Sat 9/279:20 amSYD - STL
2 stops29h 38mAir Canada
Deal found 6/11$1,189
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.
Sat 8/166:20 pmORD - SYD
2 stops26h 25mFiji Airways
Sat 8/231:45 pmSYD - ORD
2 stops22h 12mFiji Airways
Deal found 6/10$1,227
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.
Wed 8/272:07 pmORD - SYD
2 stops26h 23mAlaska Airlines
Wed 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.
Sun 9/144:02 pmSTL - SYD
1 stop23h 53mAmerican Airlines
Sat 9/279:10 amSYD - STL
2 stops23h 50mAmerican Airlines
Deal found 6/11$1,259
This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/105:50 pmORD - SYD
2 stops23h 55mAir New Zealand
Wed 9/2411:50 amSYD - ORD
2 stops24h 50mAir New Zealand
Deal found 6/11$1,303
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.
Tue 7/296:15 pmSTL - SYD
2 stops25h 20mAir New Zealand
Tue 8/128:45 amSYD - STL
2 stops47h 00mAir New Zealand
Deal found 6/12$1,316
This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/27:03 pmORD - SYD
1 stop21h 27mQantas Airways
Tue 10/1410:10 amSYD - ORD
1 stop22h 52mQantas Airways
Deal found 6/10$1,364
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/118:25 amSTL - SYD
2 stops31h 35mUnited Airlines
Sat 6/2110:20 amSYD - STL
1 stop22h 40mUnited Airlines
Deal found 6/10$1,364
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/269:28 amSTL - SYD
2 stops30h 07mDelta
Mon 7/79:25 amSYD - STL
2 stops30h 13mDelta
Deal found 6/11$1,369

Cheapflights Fare Finder

Customize your flight search to find flights from Illinois to Sydney 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 June 12, 2025.
Use the filters below to find and compare flights from Illinois to Sydney that are best for you.

Fly from

Illinois

Fly to

Sydney

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 7/2

7:42 am-7:30 am

1 stop32h 48m

Sydney Kingsford Smith

Thu 7/17

5:45 pm-6:03 am

2 stops27h 18m

$1,045

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 8/16

6:20 pm-11:45 am

2 stops26h 25m

Sydney Kingsford Smith

Sat 8/23

1:45 pm-8:57 pm

2 stops22h 12m

$1,227

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 8/27

2:07 pm-7:30 am

2 stops26h 23m

Sydney Kingsford Smith

Wed 9/3

5:45 pm-7:03 am

2 stops28h 18m

$1,252

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 7/29

5:27 pm-6:55 am

1 stop22h 28m

Sydney Kingsford Smith

Tue 8/12

9:10 am-11:09 pm

1 stop28h 59m

$1,270

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 9/10

5:50 pm-8:45 am

2 stops23h 55m

Sydney Kingsford Smith

Wed 9/24

11:50 am-9:40 pm

2 stops24h 50m

$1,303

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 7/29

6:15 pm-10:35 am

2 stops25h 20m

Sydney Kingsford Smith

Tue 8/12

8:45 am-4:45 pm

2 stops47h 00m

$1,316

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 7/29

1:17 pm-7:05 am

2 stops26h 48m

Sydney Kingsford Smith

Tue 8/12

9:10 am-11:09 pm

1 stop28h 59m

$1,348

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 9/2

7:03 pm-7:30 am

1 stop21h 27m

Sydney Kingsford Smith

Tue 10/14

10:10 am-5:02 pm

1 stop22h 52m

$1,364

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 7/15

7:45 am-6:35 am

2 stops31h 50m

Sydney Kingsford Smith

Wed 7/30

9:25 am-6:47 pm

2 stops24h 22m

$1,365

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 9/2

3:40 pm-7:20 am

1 stop24h 40m

Sydney Kingsford Smith

Wed 9/24

9:20 am-8:01 am

2 stops37h 41m

$1,372

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 46 results
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Best time to book a flight from Illinois to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney 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 Sydney

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

Currently, March is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,041). Flying from Illinois to Sydney 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 SYD?

Find hourly flight availability from Illinois to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 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 Sydney as you normally would.

Rainfall in Sydney by month

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

In terms of precipitation, rainfall in Sydney 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 Sydney when rainfall is around 2.0 in.

Temperature in Sydney by month

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

If weather is an important factor for your trip to Sydney, 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 Sydney

Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated June 12, 2025.
See what other customers who have flown with Air Tahiti Nui, Korean Air and Japan Airlines from Illinois to Sydney have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Food

7.8

Crew

9.0

Comfort

8.1

Overall

8.7

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
8.7
Very good
64 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Food

7.8

Crew

9.0

Comfort

8.1

Overall

8.7

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
1,088 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Food

7.8

Crew

9.0

Comfort

8.1

Overall

8.7

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

Boarding

8.7

Food

7.8

Crew

9.0

Comfort

8.1

Overall

8.7

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
882 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Food

7.8

Crew

9.0

Comfort

8.1

Overall

8.7

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.
Fiji Airways
8.1
Very good
194 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Food

7.8

Crew

9.0

Comfort

8.1

Overall

8.7

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 Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Sydney from Illinois?

    If you book a flight to Sydney from Illinois, you will be flying to Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 4.6 mi from the center of Sydney.

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

    For one-way options, check prices for Alaska Airlines. According to our data, you can fly for as low as $674. Users have also found prices from $690 and $777 on Fiji Airways and Qantas Airways, respectively.

  • What are the most popular routes from Illinois to Sydney?

    While some choose either Chicago Midway - Sydney Kingsford Smith or Evansville Dress Regional - Sydney Kingsford Smith, Chicago O'Hare Intl - Sydney Kingsford Smith is the most popular route from Illinois to Sydney.

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

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

  • How can I find direct flights from Illinois to Sydney?

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

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

    Yes. Cheapflights offers flight deals from Illinois to Sydney 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 Sydney?

    Currently, March is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,041). Flying from Illinois to Sydney 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

Traveling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
Wollongong
Parramatta
Manly
Coogee

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Alternative routes for Illinois to Sydney

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Top 8 airlines flying from Illinois to Sydney

Discover the top 8 airlines that operate flights from Illinois to Sydney. 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$679Average$1,144FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$813Average$960FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$825Average$870FlexibilityNo cancel feeOn-time71%
DeltaCheapest$852Average$965FlexibilityNo cancel feeOn-timeN/A
Fiji AirwaysCheapest$970Average$1,181FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$972Average$1,240FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$1,203Average$1,467FlexibilityNo cancel feeOn-time69%
Air New ZealandCheapest$1,275Average$1,506FlexibilityNo cancel feeOn-time78%

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