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$628+ 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 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
Dec 2 — Dec 91
Tue 12/2
Tue 12/9
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 November 2, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$847
(Orbitz)

One-way from

$628
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$995
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. 17% potential increase in price ($207 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 2, 2025.

This Travelocity deal was found by Cheapflights users on 10/31. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/281:10 pmORD - SYD
1 stop27h 25mMultiple Airlines
Fri 12/56:20 amSYD - ORD
2 stops25h 21mMultiple Airlines
Deal found 10/31$864
This Air Canada deal was found by Cheapflights users on 10/31. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/308:45 amORD - SYD
2 stops31h 50mAir Canada
Thu 12/114:00 pmSYD - ORD
2 stops42h 10mAir Canada
Deal found 10/31$883
This Air Canada deal was found by Cheapflights users on 10/31. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/298:15 pmORD - SYD
2 stops44h 20mAir Canada
Thu 12/114:00 pmSYD - ORD
1 stop39h 41mAir Canada
Deal found 10/31$889
This FlightHub deal was found by Cheapflights users on 10/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/197:20 amORD - SYD
2 stops33h 15mAir Canada
Wed 11/263:00 pmSYD - ORD
2 stops40h 41mAir Canada
Deal found 10/30$901
This Air Canada deal was found by Cheapflights users on 10/31. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2510:38 amORD - SYD
2 stops29h 57mAir Canada
Wed 12/311:20 amSYD - ORD
2 stops37h 40mAir Canada
Deal found 10/31$915
This Air Canada deal was found by Cheapflights users on 10/31. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/33:40 pmORD - SYD
2 stops33h 25mAir Canada
Thu 12/114:00 pmSYD - ORD
1 stop39h 41mAir Canada
Deal found 10/31$916
This Gotogate deal was found by Cheapflights users on 10/31. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/13:35 pmORD - SYD
2 stops49h 00mAir Canada
Thu 4/28:00 amSYD - ORD
2 stops22h 43mAir Canada
Deal found 10/31$920
This Air Canada deal was found by Cheapflights users on 10/30. 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.
Wed 12/106:05 pmORD - SYD
3 stops46h 30mAir Canada
Thu 12/2511:20 amSYD - ORD
2 stops35h 07mAir Canada
Deal found 10/30$926
This Air Canada deal was found by Cheapflights users on 10/31. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/43:40 pmORD - SYD
1 stop22h 15mAir Canada
Thu 12/114:00 pmSYD - ORD
2 stops42h 10mAir Canada
Deal found 10/31$933
This Trip.com deal was found by Cheapflights users on 10/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/139:00 amMDW - SYD
2 stops31h 00mMultiple Airlines
Thu 11/2011:20 amSYD - MDW
2 stops45h 26mMultiple Airlines
Deal found 10/30$1,189
This Ovago deal was found by Cheapflights users on 11/1. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/297:00 amSTL - SYD
1 stop33h 00mQantas Airways
Sat 12/67:15 pmSYD - STL
2 stops34h 19mQantas Airways
Deal found 11/1$1,193
This Expedia deal was found by Cheapflights users on 11/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/294:05 pmSTL - SYD
2 stops48h 30mAir Canada
Sat 12/64:00 pmSYD - STL
2 stops41h 28mAir Canada
Deal found 11/1$1,233

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 November 2, 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

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 11/29

7:00 am-9:00 am

1 stop33h 00m

Sydney Kingsford Smith

Sat 12/6

7:15 pm-12:34 pm

2 stops34h 19m

$1,193

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 11/28

7:00 am-8:50 pm

2 stops44h 50m

Sydney Kingsford Smith

Sun 12/14

2:05 pm-5:05 pm

1 stop20h 00m

$1,242

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/12

11:42 am-6:55 am

1 stop26h 13m

Sydney Kingsford Smith

Sun 11/23

2:05 pm-7:30 pm

1 stop22h 25m

$1,248

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/5

11:42 am-6:55 am

1 stop26h 13m

Sydney Kingsford Smith

Sun 11/23

11:20 am-7:30 pm

2 stops25h 10m

$1,252

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 11/19

12:45 pm-7:00 am

1 stop25h 15m

Sydney Kingsford Smith

Tue 12/9

11:20 am-2:25 pm

1 stop20h 05m

$1,253

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 11/18

4:40 pm-9:05 am

1 stop23h 25m

Sydney Kingsford Smith

Tue 12/9

12:10 pm-2:48 pm

1 stop19h 38m

$1,253

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 11/18

6:00 pm-9:05 am

1 stop22h 05m

Sydney Kingsford Smith

Wed 12/3

11:50 am-2:41 pm

1 stop19h 51m

$1,264

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 11/24

10:35 am-7:00 am

1 stop27h 25m

Sydney Kingsford Smith

Wed 12/3

11:20 am-2:25 pm

1 stop20h 05m

$1,264

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 11/18

6:25 pm-9:15 am

1 stop21h 50m

Sydney Kingsford Smith

Tue 12/2

12:10 pm-2:48 pm

1 stop19h 38m

$1,264

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 11/30

2:21 pm-7:00 am

1 stop23h 39m

Sydney Kingsford Smith

Tue 12/9

2:00 pm-5:00 pm

1 stop20h 00m

$1,264

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

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, August is the cheapest month in which you can book a flight from Illinois to Sydney (average of $198). Flying from Illinois to Sydney in January is currently the most expensive (average of $853). 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 November 2, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 31% on flights from Illinois to Sydney by exploring options for tickets at noon.

What is the cheapest day to fly from Illinois to Sydney?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Sydney. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Illinois to Sydney flight should consider departing on Sunday at noon when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 15m. Fly via Qantas Airways, American Airlines, or United Airlines to get the fastest option. The distance from Illinois to Sydney is about 9228 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 Fiji Airways. According to our data, you can fly for as low as $656. Users have also found prices from $672 and $851 on Air Canada and Delta, 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 $198). Flying from Illinois to Sydney in January is currently the most expensive (average of $853). 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
Manly
Coogee

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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 November 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$679Average$1,193FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$811Average$907FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$822Average$1,407FlexibilityNo cancel feeOn-time71%
DeltaCheapest$846Average$1,018FlexibilityNo cancel feeOn-timeN/A
Fiji AirwaysCheapest$849Average$1,181FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$871Average$1,270FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$936Average$1,249FlexibilityNo cancel feeOn-time67%
Air New ZealandCheapest$1,282Average$1,501FlexibilityNo cancel feeOn-time78%

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