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$605+ 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 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
Jul 9 — Jul 161
Thu 7/9
Thu 7/16
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 June 9, 2026.

This Air Canada deal was found by Cheapflights users on 6/6. 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.
Sat 8/812:10 pm
STL
-
SYD
2 stops52h 10m
Air Canada
Sun 8/169:20 am
SYD
-
STL
2 stops48h 22m
Air Canada
Deal found 6/6$1,190
This KAYAK deal was found by Cheapflights users on 6/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/78:00 pm
ORD
-
SYD
2 stops31h 15m
ANA
Wed 11/189:45 pm
SYD
-
ORD
1 stop26h 35m
ANA
Deal found 6/8$1,305
This KAYAK deal was found by Cheapflights users on 6/4. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/315:45 pm
ORD
-
SYD
1 stop24h 40m
ANA
Tue 9/1511:45 am
SYD
-
ORD
2 stops32h 00m
ANA
Deal found 6/4$1,307
This Rumbo deal was found by Cheapflights users on 6/7. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/86:35 am
STL
-
SYD
1 stop33h 30m
Qantas Airways
Sun 6/219:10 am
SYD
-
STL
1 stop29h 46m
Qantas Airways
Deal found 6/7$1,308
This KAYAK deal was found by Cheapflights users on 6/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/64:25 pm
ORD
-
SYD
1 stop34h 50m
ANA
Thu 11/1912:25 pm
SYD
-
ORD
2 stops43h 50m
ANA
Deal found 6/8$1,310
This lol.travel deal was found by Cheapflights users on 6/7. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/218:45 am
ORD
-
SYD
1 stop31h 35m
Air Canada
Tue 7/79:20 am
SYD
-
ORD
1 stop20h 16m
Air Canada
Deal found 6/7$1,313
This United Airlines deal was found by Cheapflights users on 6/7. 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 6/82:57 pm
STL
-
SYD
2 stops24h 58m
United Airlines
Sun 6/2110:20 am
SYD
-
STL
1 stop22h 57m
United Airlines
Deal found 6/7$1,313
This KAYAK deal was found by Cheapflights users on 6/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/37:15 am
ORD
-
SYD
2 stops44h 00m
ANA
Fri 11/1312:25 pm
SYD
-
ORD
1 stop35h 55m
ANA
Deal found 6/8$1,314
This KAYAK deal was found by Cheapflights users on 6/4. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/115:45 pm
ORD
-
SYD
1 stop34h 25m
ANA
Mon 8/2411:45 am
SYD
-
ORD
2 stops47h 41m
ANA
Deal found 6/4$1,318
This United Airlines deal was found by Cheapflights users on 6/6. 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.
Sun 6/77:23 pm
STL
-
SYD
1 stop20h 32m
United Airlines
Sun 6/2110:20 am
SYD
-
STL
1 stop22h 57m
United Airlines
Deal found 6/6$1,319
This KAYAK deal was found by Cheapflights users on 6/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/34:00 pm
ORD
-
SYD
2 stops59h 15m
ANA
Sat 11/149:45 pm
SYD
-
ORD
2 stops48h 20m
ANA
Deal found 6/8$1,322
This KAYAK deal was found by Cheapflights users on 6/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/29:25 am
ORD
-
SYD
2 stops65h 50m
ANA
Sat 11/149:45 pm
SYD
-
ORD
2 stops48h 20m
ANA
Deal found 6/8$1,323

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 June 9, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,190
(Air Canada)

One-way from

$605
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$1,384
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. 5% potential increase in price ($83 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 9, 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

Sat 8/8

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Sun 8/16

10:20 am-6:39 pm

1 stop23h 19m

$1,381

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 7/3

3:22 pm-6:55 am

2 stops24h 33m

Sydney Kingsford Smith

Fri 7/10

10:20 am-6:17 pm

1 stop22h 57m

$1,422

EvansvilleSydney

EVV - SYD

EVVSYD

Evansville Dress Regional

Thu 7/23

12:46 pm-6:55 am

2 stops27h 09m

Sydney Kingsford Smith

Thu 7/30

9:10 am-11:31 pm

2 stops29h 21m

$1,432

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/7

8:42 am-6:55 am

1 stop31h 13m

Sydney Kingsford Smith

Mon 9/14

10:20 am-6:39 pm

1 stop23h 19m

$1,459

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/7

8:42 am-6:55 am

1 stop31h 13m

Sydney Kingsford Smith

Mon 9/14

10:20 am-6:39 pm

1 stop23h 19m

$1,459

EvansvilleSydney

EVV - SYD

EVVSYD

Evansville Dress Regional

Mon 10/19

5:30 pm-8:05 am

2 stops22h 35m

Sydney Kingsford Smith

Tue 10/27

11:15 am-11:28 pm

2 stops28h 13m

$1,460

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 11/6

7:06 pm-9:15 am

1 stop21h 09m

Sydney Kingsford Smith

Sun 11/15

11:50 am-10:06 pm

1 stop27h 16m

$1,510

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 8/25

6:54 pm-6:50 pm

2 stops32h 56m

Sydney Kingsford Smith

Tue 9/1

8:45 pm-6:20 am

3 stops24h 35m

$1,518
Quickest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 7/19

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Sun 7/26

10:20 am-6:17 pm

1 stop22h 57m

$1,532

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 9/1

3:43 pm-6:50 pm

2 stops36h 07m

Sydney Kingsford Smith

Tue 9/8

8:45 pm-6:20 am

3 stops24h 35m

$1,537

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/4

Showing 1-10 of 59 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 October is currently the most expensive (average of $831). 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?

How far ahead should I book a flight from Illinois to Sydney?

The price you pay for your flight from Illinois to Sydney may vary depending on when you book. For the best chance of a lower fare, look to book 46 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 20h 32m. Fly via United Airlines, American Airlines, or Air New Zealand 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 $835 on ANA and United 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 October is currently the most expensive (average of $831). 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 June 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$198Average$1,695FlexibilityNo cancel feeOn-time71%
DeltaCheapest$229Average$1,418FlexibilityNo cancel feeOn-timeN/A
Fiji AirwaysCheapest$716Average$1,162FlexibilityNo cancel feeOn-time74%
Qantas AirwaysCheapest$836Average$1,356FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$870Average$1,560FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$898Average$1,267FlexibilityNo cancel feeOn-time67%
ANACheapest$1,193Average$1,288FlexibilityNo cancel feeOn-time80%
Air New ZealandCheapest$1,282Average$1,545FlexibilityNo cancel feeOn-time78%

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