HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sydney

$420+ 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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
Apr 29 — May 61
Tue 4/29
Tue 5/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Sydney 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 Sydney

Keep the following information in mind while searching for Illinois to Sydney flight deals. Data was last updated April 24, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,039
(Trip.com)

One-way from

$420
(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 Sydney Kingsford Smith
Search Deals
One-way flight from Illinois to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($152 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 April 24, 2025.

This Trip.com deal was found by Cheapflights users on 4/23. 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 6/57:40 amMDW - SYD
2 stops37h 35mMultiple Airlines
Thu 6/121:15 pmSYD - MDW
2 stops37h 36mMultiple Airlines
Deal found 4/23$1,039
This Mytrip deal was found by Cheapflights users on 4/22. 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 6/511:45 amORD - SYD
3 stops33h 30mMultiple Airlines
Thu 6/121:15 pmSYD - ORD
3 stops32h 36mMultiple Airlines
Deal found 4/22$1,076
This Gurufare deal was found by Cheapflights users on 4/22. 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.
Sat 11/86:49 pmORD - SYD
2 stops45h 31mQantas Airways
Sat 11/159:35 pmSYD - ORD
2 stops42h 25mQantas Airways
Deal found 4/22$1,119
This Trip.com deal was found by Cheapflights users on 4/22. 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.
Tue 6/36:45 pmORD - SYD
2 stops26h 00mFiji Airways
Tue 6/106:15 amSYD - ORD
2 stops29h 39mFiji Airways
Deal found 4/22$1,164
This StudentUniverse deal was found by Cheapflights users on 4/22. 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 8/124:50 pmORD - SYD
2 stops24h 55mAir New Zealand
Tue 8/2611:50 amSYD - ORD
2 stops24h 50mAir New Zealand
Deal found 4/22$1,183
This Cheapflightsfares deal was found by Cheapflights users on 4/23. 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.
Sun 10/265:35 pmORD - SYD
1 stop34h 40mANA
Mon 11/249:45 pmSYD - ORD
1 stop26h 35mANA
Deal found 4/23$1,187
This StudentUniverse deal was found by Cheapflights users on 4/22. 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.
Sun 10/128:27 amSTL - SYD
2 stops32h 18mAir New Zealand
Sun 10/267:55 amSYD - STL
2 stops30h 11mAir New Zealand
Deal found 4/22$1,204
This StudentUniverse deal was found by Cheapflights users on 4/21. 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.
Wed 5/74:00 pmORD - SYD
1 stop27h 50mCathay Pacific
Mon 5/199:50 pmSYD - ORD
1 stop31h 35mCathay Pacific
Deal found 4/21$1,319
This Air Canada deal was found by Cheapflights users on 4/22. 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.
Mon 10/68:47 amORD - SYD
2 stops31h 33mAir Canada
Mon 10/2010:20 amSYD - ORD
1 stop22h 22mAir Canada
Deal found 4/22$1,324
This Air New Zealand deal was found by Cheapflights users on 4/22. 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 New Zealand is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/201:39 pmSTL - SYD
3 stops28h 06mMultiple Airlines
Wed 9/311:50 amSYD - STL
2 stops25h 26mMultiple Airlines
Deal found 4/22$1,356
This Air Canada deal was found by Cheapflights users on 4/22. 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.
Fri 11/284:15 pmSTL - SYD
2 stops45h 40mAir Canada
Sun 12/1411:20 amSYD - STL
2 stops45h 06mAir Canada
Deal found 4/22$1,368
This Alaska Airlines deal was found by Cheapflights users on 4/22. 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.
Tue 9/98:42 pmORD - SYD
2 stops32h 03mAlaska Airlines
Tue 9/239:40 pmSYD - ORD
2 stops23h 00mAlaska Airlines
Deal found 4/22$1,393

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 April 24, 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

MDW - SYD

MDWSYD

Chicago Midway

Thu 6/5

7:40 am-12:15 pm

2 stops37h 35m

Sydney Kingsford Smith

Thu 6/12

1:15 pm-11:51 am

2 stops37h 36m

$1,039

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 6/5

11:45 am-12:15 pm

3 stops33h 30m

Sydney Kingsford Smith

Thu 6/12

1:15 pm-6:51 am

3 stops32h 36m

$1,076

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 6/3

6:45 pm-11:45 am

2 stops26h 00m

Sydney Kingsford Smith

Tue 6/10

6:15 am-8:54 pm

2 stops29h 39m

$1,164

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 8/12

4:50 pm-8:45 am

2 stops24h 55m

Sydney Kingsford Smith

Tue 8/26

11:50 am-9:40 pm

2 stops24h 50m

$1,183

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 8/19

5:45 pm-7:15 pm

1 stop34h 30m

Sydney Kingsford Smith

Sat 8/30

11:50 am-8:40 am

1 stop35h 50m

$1,216

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 5/7

4:00 pm-10:50 am

1 stop27h 50m

Sydney Kingsford Smith

Mon 5/19

9:50 pm-2:25 pm

1 stop31h 35m

$1,319

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 10/6

8:47 am-8:20 am

2 stops31h 33m

Sydney Kingsford Smith

Mon 10/20

10:20 am-4:42 pm

1 stop22h 22m

$1,324

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 9/9

6:45 pm-7:05 am

1 stop21h 20m

Sydney Kingsford Smith

Tue 9/23

9:10 am-2:17 pm

1 stop20h 07m

$1,349

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 9/9

8:42 pm-7:45 pm

2 stops32h 03m

Sydney Kingsford Smith

Tue 9/23

9:40 pm-5:40 am

2 stops23h 00m

$1,393

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 10/1

7:50 pm-7:00 pm

2 stops32h 10m

Sydney Kingsford Smith

Thu 10/9

9:55 pm-5:55 pm

2 stops36h 00m

$1,413

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

Showing 1-10 of 46 results
1
2
3
...
5

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 April 24, 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 April 24, 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
8.8
Very good
62 reviews

Entertainment

7.3

Comfort

8.1

Crew

9.1

Boarding

8.7

Food

7.8

Overall

8.8

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

Entertainment

7.3

Comfort

8.1

Crew

9.1

Boarding

8.7

Food

7.8

Overall

8.8

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
1,062 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Entertainment

7.3

Comfort

8.1

Crew

9.1

Boarding

8.7

Food

7.8

Overall

8.8

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
1,452 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Entertainment

7.3

Comfort

8.1

Crew

9.1

Boarding

8.7

Food

7.8

Overall

8.8

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
853 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Entertainment

7.3

Comfort

8.1

Crew

9.1

Boarding

8.7

Food

7.8

Overall

8.8

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
188 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Entertainment

7.3

Comfort

8.1

Crew

9.1

Boarding

8.7

Food

7.8

Overall

8.8

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 $681. Users have also found prices from $691 and $802 on ANA and Qantas Airways, 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

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 Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Sydney flights
John F Kennedy Intl to Sydney flights
San Francisco to Sydney flights
Dallas/Fort Worth to Sydney flights
Newark to Sydney flights
LaGuardia to Sydney flights
Dulles Intl to Sydney flights
Seattle to Sydney flights
O'Hare Intl to Sydney flights
Hobby to Sydney flights
Ontario to Sydney flights
Reagan-National to Sydney flights
Santa Ana to Sydney flights
Baltimore to Sydney flights
Boston to Sydney flights
Atlanta to Sydney flights
George Bush Intcntl to Sydney flights
Honolulu to Sydney flights
Minneapolis to Sydney flights
Denver to Sydney flights
Midway to Sydney flights
Detroit to Sydney flights
Burbank to Sydney flights
Miami to Sydney flights
Sky Harbor Intl to Sydney flights
San Jose to Sydney flights
Orlando to Sydney flights
Oakland to Sydney flights
Salt Lake City to Sydney flights
Philadelphia to Sydney flights
Charlotte to Sydney flights
San Diego to Sydney flights
Raleigh to Sydney flights
Kansas City to Sydney flights
Nashville to Sydney flights
Austin to Sydney flights
Tampa to Sydney flights
Portland to Sydney flights
Indianapolis to Sydney flights
Cincinnati to Sydney flights
Fort Lauderdale to Sydney flights
Las Vegas to Sydney flights
Love Field to Sydney flights
Cleveland to Sydney flights
Pittsburgh to Sydney flights
Columbus to Sydney flights
St. Louis to Sydney flights
Charleston to Sydney flights
Anchorage to Sydney flights
New Orleans to Sydney flights

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 April 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$679Average$1,011FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$806Average$966FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$825Average$871FlexibilityNo cancel feeOn-time71%
DeltaCheapest$852Average$975FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$976Average$1,241FlexibilityNo cancel feeOn-time67%
Fiji AirwaysCheapest$1,160Average$1,330FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$1,187Average$1,476FlexibilityNo cancel feeOn-time69%
Air New ZealandCheapest$1,256Average$1,704FlexibilityNo cancel feeOn-time78%

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.