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$504+ 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 7/30. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
May 17 — May 241
Sun 5/17
Sun 5/24
1 adult, Economy
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Cheap 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 17, 2026.

This Trip.com deal was found by Cheapflights users on 4/13. 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.
Fri 5/227:15 am
ORD
-
SYD
2 stops37h 35m
Multiple Airlines
Sat 5/301:15 pm
SYD
-
ORD
3 stops37h 49m
Multiple Airlines
Deal found 4/13$1,202
This Trip.com deal was found by Cheapflights users on 4/15. 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.
Fri 6/197:12 am
ORD
-
SYD
3 stops37h 38m
Multiple Airlines
Sat 7/41:15 pm
SYD
-
ORD
2 stops32h 04m
Multiple Airlines
Deal found 4/15$1,217
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/58:56 pm
ORD
-
SYD
2 stops47h 54m
Multiple Airlines
Tue 5/125:50 pm
SYD
-
ORD
1 stop27h 49m
Multiple Airlines
Deal found 4/14$1,223
This Cheapflightsfares deal was found by Cheapflights users on 4/15. 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.
Tue 11/34:25 pm
ORD
-
SYD
1 stop34h 50m
ANA
Tue 11/179:45 pm
SYD
-
ORD
1 stop26h 35m
ANA
Deal found 4/15$1,230
This Cheapflightsfares deal was found by Cheapflights users on 4/17. 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.
Wed 11/44:25 pm
ORD
-
SYD
1 stop34h 50m
ANA
Tue 11/179:45 pm
SYD
-
ORD
1 stop26h 35m
ANA
Deal found 4/17$1,231
This Kiwi.com deal was found by Cheapflights users on 4/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/58:56 pm
ORD
-
SYD
2 stops47h 54m
Multiple Airlines
Sat 5/95:50 pm
SYD
-
ORD
1 stop27h 09m
Multiple Airlines
Deal found 4/13$1,233
This Gotogate deal was found by Cheapflights users on 4/14. 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.
Sun 10/185:45 pm
ORD
-
SYD
1 stop24h 40m
ANA
Wed 11/1112:25 pm
SYD
-
ORD
1 stop35h 55m
ANA
Deal found 4/14$1,238
This Cheapflightsfares deal was found by Cheapflights users on 4/14. 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.
Wed 8/265:45 pm
ORD
-
SYD
1 stop34h 25m
ANA
Tue 9/811:45 am
SYD
-
ORD
2 stops32h 00m
ANA
Deal found 4/14$1,239
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1612:05 pm
ORD
-
SYD
2 stops32h 45m
Multiple Airlines
Thu 5/285:50 pm
SYD
-
ORD
1 stop27h 44m
Multiple Airlines
Deal found 4/14$1,242
This Trip.com deal was found by Cheapflights users on 4/16. 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 5/56:00 am
MDW
-
SYD
2 stops34h 05m
Multiple Airlines
Tue 5/129:10 am
SYD
-
MDW
2 stops40h 59m
Multiple Airlines
Deal found 4/16$1,304
This United Airlines deal was found by Cheapflights users on 4/17. 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.
Mon 5/48:30 am
STL
-
SYD
1 stop31h 25m
United Airlines
Mon 5/1810:20 am
SYD
-
STL
1 stop23h 02m
United Airlines
Deal found 4/17$1,304
This Delta deal was found by Cheapflights users on 4/16. 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.
Mon 5/410:50 am
STL
-
SYD
2 stops29h 00m
Delta
Mon 5/189:15 am
SYD
-
STL
2 stops26h 54m
Delta
Deal found 4/16$1,307

Find 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 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,202
(Trip.com)

One-way from

$504
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$1,452
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. 4% potential increase in price ($63 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

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 17, 2026.
Use the filters below to find and compare flights from Illinois to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

10:50 am-6:50 am

2 stops29h 00m

Sydney Kingsford Smith

Mon 5/18

9:15 am-9:09 pm

2 stops26h 54m

$1,307

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

2:35 pm-6:55 am

2 stops25h 20m

Sydney Kingsford Smith

Mon 5/18

10:20 am-6:22 pm

1 stop23h 02m

$1,308

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 5/31

2:27 pm-6:50 am

2 stops25h 23m

Sydney Kingsford Smith

Sun 6/7

9:15 am-12:39 am

2 stops30h 24m

$1,308

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 9/1

1:03 pm-7:30 am

2 stops27h 27m

Sydney Kingsford Smith

Tue 9/22

5:50 pm-1:26 pm

2 stops34h 36m

$1,382

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 8/26

1:03 pm-7:30 am

2 stops27h 27m

Sydney Kingsford Smith

Tue 9/1

5:50 pm-6:22 am

2 stops27h 32m

$1,401

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 5/31

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Sun 6/7

10:20 am-6:17 pm

1 stop22h 57m

$1,417

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Mon 6/1

1:21 pm-7:00 am

2 stops26h 39m

Sydney Kingsford Smith

Mon 6/8

9:30 am-4:58 pm

2 stops22h 28m

$1,422

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Mon 6/1

9:22 am-6:50 am

2 stops30h 28m

Sydney Kingsford Smith

Mon 6/15

9:15 am-6:18 pm

2 stops24h 03m

$1,422

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Tue 9/1

1:00 pm-6:50 am

2 stops26h 50m

Sydney Kingsford Smith

Tue 9/8

9:15 am-6:31 pm

2 stops24h 16m

$1,422
Quickest round-trip

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 9/16

6:30 pm-6:50 am

1 stop21h 20m

Sydney Kingsford Smith

Fri 10/2

9:15 am-2:00 pm

1 stop19h 45m

$1,468

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/13

Showing 1-10 of 57 resultsSorted by cheapest first
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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, August is the cheapest month in which you can book a flight from Illinois to Sydney (average of $138). Flying from Illinois to Sydney in July is currently the most expensive (average of $845). 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.

How much does it cost to fly round-trip from Illinois to Sydney?

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.

  • How long is the flight from Illinois to Sydney?

    There are many flights that can get you from Illinois to Sydney in 25h 20m. Fly via Delta, United Airlines, or Alaska Airlines to get the fastest option. The distance from Illinois to Sydney is about 9054 mi. This flight may include one or multiple stops.

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

    For one-way options, check prices for Qantas Airways. According to our data, you can fly for as low as $421. Users have also found prices from $691 and $827 on ANA and American Airlines, 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, August is the cheapest month in which you can book a flight from Illinois to Sydney (average of $138). Flying from Illinois to Sydney in July is currently the most expensive (average of $845). 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 Sydney?

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

Browse thousands of different options on Cheapflights for your next trip

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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 April 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$198Average$1,695FlexibilityNo cancel feeOn-time71%
DeltaCheapest$317Average$1,467FlexibilityNo cancel feeOn-timeN/A
Fiji AirwaysCheapest$716Average$1,181FlexibilityNo cancel feeOn-time74%
Qantas AirwaysCheapest$837Average$1,363FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$870Average$1,557FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$898Average$1,246FlexibilityNo cancel feeOn-time67%
ANACheapest$1,177Average$1,259FlexibilityNo cancel feeOn-time80%
Air New ZealandCheapest$1,282Average$1,461FlexibilityNo cancel feeOn-time78%

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