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Cheap flights from Illinois to Sydney from $713

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 5/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
19 Dec — 26 Dec1
1 adult
1 adult, Economy, 0 bags

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 19 November 2025.

Round-trip from

$1,384

One-way from

$713

Popular in

December

Cheapest in

August

Average price

$1,479
Qantas Airways
  • Qantas Airways
  • 26/2-3/3
  • 3 total stops
  • 52h 34m total
  • Illinois to Sydney
Search Deals
5/2
  • 5/2
  • 3 total stops
  • 37h 55m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($410 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($90 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Find flight deals from Illinois to Sydney

Enter your travel dates to find the best prices.

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 19 November 2025.

Mon 1/1218:23ORD - SYD
1 stop21h 37mQantas Airways
Sat 6/1207:05SYD - ORD
2 stops26h 49mQantas Airways
Deal found 16/11$1,385
Tue 25/1118:23ORD - SYD
1 stop21h 37mQantas Airways
Tue 9/1207:05SYD - ORD
2 stops25h 57mQantas Airways
Deal found 16/11$1,510
Wed 10/1218:17ORD - SYD
2 stops33h 33mQantas Airways
Wed 17/1211:20SYD - ORD
1 stop21h 42mQantas Airways
Deal found 16/11$1,593
Sat 6/1206:50ORD - SYD
1 stop31h 35mMultiple Airlines
Sun 21/1211:20SYD - ORD
1 stop21h 29mMultiple Airlines
Deal found 17/11$1,665
Mon 8/1206:15MDW - SYD
2 stops32h 10mMultiple Airlines
Mon 15/1217:45SYD - MDW
2 stops32h 01mMultiple Airlines
Deal found 18/11$1,690
Mon 1/1208:10ORD - SYD
2 stops35h 25mMultiple Airlines
Sat 6/1214:00SYD - ORD
2 stops27h 13mMultiple Airlines
Deal found 18/11$1,694
Tue 25/1116:58ORD - SYD
3 stops26h 37mMultiple Airlines
Tue 9/1214:00SYD - ORD
2 stops33h 05mMultiple Airlines
Deal found 16/11$1,713
Sat 6/1206:00MDW - SYD
2 stops32h 25mMultiple Airlines
Sun 21/1211:20SYD - MDW
2 stops29h 01mMultiple Airlines
Deal found 17/11$1,718
Thu 11/1206:50ORD - SYD
1 stop33h 10mMultiple Airlines
Thu 12/311:20SYD - ORD
1 stop20h 38mMultiple Airlines
Deal found 16/11$1,733
Wed 10/1208:00ORD - SYD
2 stops30h 25mMultiple Airlines
Wed 17/1217:45SYD - ORD
1 stop29h 20mMultiple Airlines
Deal found 17/11$1,827
Fri 28/1107:00STL - SYD
2 stops46h 25mQantas Airways
Sun 14/1214:05SYD - STL
1 stop20h 00mQantas Airways
Deal found 19/11$1,879
Mon 1/1205:30MDW - SYD
2 stops34h 30mMultiple Airlines
Sat 6/1211:20SYD - MDW
2 stops50h 25mMultiple Airlines
Deal found 17/11$1,910

Cheapflights Fare Finder

 
Customise 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 647,157 searches. Data last updated 19 November 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

Mon 4/5

16:30-07:20

2 stops23h 50m

Sydney Kingsford Smith

Mon 18/5

09:20-18:25

2 stops48h 05m

$1,693

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:30-07:20

3 stops50h 50m

Sydney Kingsford Smith

Mon 18/5

09:20-18:25

2 stops48h 05m

$1,696

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Sat 6/12

06:00-07:25

2 stops32h 25m

Sydney Kingsford Smith

Sun 21/12

11:20-23:21

2 stops29h 01m

$1,719

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 10/4

18:02-07:20

2 stops46h 18m

Sydney Kingsford Smith

Fri 24/4

09:20-16:52

2 stops22h 32m

$1,819

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Mon 1/12

05:30-09:00

2 stops34h 30m

Sydney Kingsford Smith

Sat 6/12

11:20-20:45

2 stops50h 25m

$1,910

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 10/4

18:00-06:55

1 stop21h 55m

Sydney Kingsford Smith

Fri 24/4

09:10-23:16

1 stop29h 06m

$1,962

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/2

11:55-06:55

1 stop26h 00m

Sydney Kingsford Smith

Thu 26/2

14:05-17:05

1 stop20h 00m

$1,964

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 20/1

17:04-06:55

1 stop20h 51m

Sydney Kingsford Smith

Tue 27/1

17:45-23:59

1 stop23h 14m

$1,967

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

06:30-07:30

1 stop34h 00m

Sydney Kingsford Smith

Mon 18/5

09:10-23:16

1 stop29h 06m

$1,979

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/3

16:39-07:00

1 stop21h 21m

Sydney Kingsford Smith

Wed 18/3

11:50-16:05

1 stop20h 15m

$1,988

Flights are sorted by cheapest return flights first.

Deals found on 18/11

Showing 1-10 of 60 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 return 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 $305). Flying from Illinois to Sydney in January is currently the most expensive (average of $1,308). 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 19 November 2025.

Unlike at midday, when flights are generally more expensive, you can save up to 39% on flights from Illinois to Sydney by exploring options for tickets in the afternoon.

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?

    Located just 7.5 km from the city centre, Sydney Kingsford Smith (SYD) is the airport most travelers will use when flying to Sydney from Illinois.

  • How long is the flight from Illinois to Sydney?

    A quick flight from Illinois to Sydney can take about 21h 55m. Air Canada provides one of the quickest options available for as low as $1,962. The distance between Illinois and Sydney is about 14571 km. Both multi-stop and direct flights can be found to your destination and back.

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

    When deciding which route to take from Illinois to Sydney, consider Chicago O'Hare Intl - Sydney Kingsford Smith, Chicago Midway - Sydney Kingsford Smith or Lambert-St Louis - Sydney Kingsford Smith, as they are the most popular.

  • 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 holiday 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 $305). Flying from Illinois to Sydney in January is currently the most expensive (average of $1,308). 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

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Katoomba
Penrith
Terrigal
Manly
Randwick
Lithgow
Coogee
Leura
Bondi Beach
Cronulla

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Top 2 airlines flying from Illinois to Sydney

Discover the top 2 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 647,157 searches. Data last updated 19 November 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$1,319Average$1,332FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Qantas AirwaysCheapest$1,345Average$1,446FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Illinois to Sydney?

When you search for this flight from Illinois to Sydney, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Illinois to Sydney?

Millions of users choose and trust Cheapflights to book the best flight deals from Illinois to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Illinois to Sydney with no change fees?

Yes! Cheapflights helps users easily find flights from Illinois to Sydney with no change fees.

Can Cheapflights notify me if prices for flights from Illinois to Sydney become cheaper?

Of course! You can now track prices for flights from Illinois to Sydney and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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