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$511+ 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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
Apr 5 — Apr 121
Sat 4/5
Sat 4/12
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 March 31, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$941
(Mytrip)

One-way from

$544
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$908
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 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. 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 March 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 March 31, 2025.

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 5/118:45 amORD - SYD
2 stops31h 35mAir Canada
Tue 5/279:20 amSYD - ORD
2 stops37h 39mAir Canada
Deal found 3/30$1,034
This Cheapflightsfares 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 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 stops27h 26mQantas Airways
Deal found 3/30$1,101
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/106:45 pmORD - SYD
2 stops26h 00mFiji Airways
Sat 5/171:45 pmSYD - ORD
2 stops21h 39mFiji Airways
Deal found 3/31$1,197
This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/34:25 pmORD - SYD
1 stop34h 50mANA
Tue 11/119:45 pmSYD - ORD
1 stop26h 35mANA
Deal found 3/31$1,202
This Fiji Airways deal was found by Cheapflights users on 3/29. 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 Fiji Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/57:03 pmORD - SYD
2 stops25h 42mMultiple Airlines
Tue 8/121:15 pmSYD - ORD
2 stops25h 19mMultiple Airlines
Deal found 3/29$1,203
This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/37:19 pmSTL - SYD
2 stops25h 26mFiji Airways
Tue 6/101:15 pmSYD - STL
2 stops22h 44mFiji Airways
Deal found 3/30$1,209
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.
Tue 6/31:30 pmSTL - SYD
2 stops50h 50mAir Canada
Wed 6/119:20 amSYD - STL
2 stops25h 38mAir Canada
Deal found 3/30$1,242
This Fiji Airways 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 Fiji Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/311:39 amSTL - SYD
2 stops33h 36mMultiple Airlines
Tue 4/81:15 pmSYD - STL
2 stops24h 13mMultiple Airlines
Deal found 3/30$1,306
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/225:50 pmORD - SYD
2 stops33h 55mAlaska Airlines
Tue 10/289:40 pmSYD - ORD
2 stops34h 39mAlaska Airlines
Deal found 3/30$1,336
This Justfly.com 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/611:25 amORD - SYD
2 stops40h 35mTurkish Airlines
Wed 6/118:55 pmSYD - ORD
2 stops51h 45mTurkish Airlines
Deal found 3/30$1,422
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/281:38 pmSTL - SYD
2 stops26h 27mAmerican Airlines
Mon 6/169:10 amSYD - STL
1 stop28h 49mAmerican Airlines
Deal found 3/31$1,446
This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/34:52 pmSTL - SYD
1 stop23h 03mQantas Airways
Wed 6/119:10 amSYD - STL
1 stop28h 49mQantas Airways
Deal found 3/30$1,450

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 March 31, 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

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

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

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 8/5

7:03 pm-11:45 am

2 stops25h 42m

Sydney Kingsford Smith

Tue 8/12

1:15 pm-11:34 pm

2 stops25h 19m

$1,203

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 6/3

7:19 pm-11:45 am

2 stops25h 26m

Sydney Kingsford Smith

Tue 6/10

1:15 pm-8:59 pm

2 stops22h 44m

$1,209

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 8/27

5:45 pm-7:15 pm

1 stop34h 30m

Sydney Kingsford Smith

Sun 9/7

11:50 am-5:01 am

2 stops32h 11m

$1,212

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 6/3

1:30 pm-7:20 am

2 stops50h 50m

Sydney Kingsford Smith

Wed 6/11

9:20 am-7:58 pm

2 stops25h 38m

$1,242

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 6/11

3:12 pm-7:05 am

1 stop24h 53m

Sydney Kingsford Smith

Mon 6/23

9:10 am-3:44 pm

1 stop21h 34m

$1,351

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 5/7

6:58 pm-7:45 pm

2 stops33h 47m

Sydney Kingsford Smith

Sun 6/8

9:40 pm-6:59 pm

2 stops36h 19m

$1,364

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 5/6

11:25 am-7:00 pm

2 stops40h 35m

Sydney Kingsford Smith

Wed 6/11

8:55 pm-9:40 am

2 stops51h 45m

$1,422

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 7/22

5:51 pm-7:05 am

1 stop22h 14m

Sydney Kingsford Smith

Tue 7/29

5:45 pm-11:43 pm

1 stop20h 58m

$1,432

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/30

Showing 1-10 of 52 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, February is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,046). Flying from Illinois to Sydney 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 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 March 31, 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 March 31, 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
61 reviews

Food

7.8

Crew

9.1

Overall

8.7

Comfort

8.0

Entertainment

7.2

Boarding

8.7

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

Food

7.8

Crew

9.1

Overall

8.7

Comfort

8.0

Entertainment

7.2

Boarding

8.7

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
1,051 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Food

7.8

Crew

9.1

Overall

8.7

Comfort

8.0

Entertainment

7.2

Boarding

8.7

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

Food

7.8

Crew

9.1

Overall

8.7

Comfort

8.0

Entertainment

7.2

Boarding

8.7

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

Food

7.8

Crew

9.1

Overall

8.7

Comfort

8.0

Entertainment

7.2

Boarding

8.7

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

Food

7.8

Crew

9.1

Overall

8.7

Comfort

8.0

Entertainment

7.2

Boarding

8.7

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 Fiji Airways. According to our data, you can fly for as low as $601. Users have also found prices from $737 and $752 on Alaska Airlines and Air Canada, respectively.

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

    While some choose either Chicago Midway - Sydney Kingsford Smith or Lambert-St Louis - 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, February is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,046). Flying from Illinois to Sydney 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

Traveling to a place near Illinois?

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

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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 March 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$679Average$781FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$806Average$1,003FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$825Average$872FlexibilityNo cancel feeOn-time71%
DeltaCheapest$852Average$1,252FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$975Average$1,256FlexibilityNo cancel feeOn-time67%
Cathay PacificCheapest$1,138Average$1,317FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$1,187Average$1,486FlexibilityNo cancel feeOn-time69%
Air New ZealandCheapest$1,256Average$1,568FlexibilityNo cancel feeOn-time78%
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