Cheap flights from Illinois to Sydney from $701

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 21/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
12 Oct — 19 Oct1
1 adult
1 adult, Economy

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 12 September 2025.

Round-trip from

$1,534

One-way from

$701

Popular in

December

Cheapest in

August

Average price

$1,733
Alaska Airlines
  • Alaska Airlines
  • 17/2-3/3
  • 3 total stops
  • 56h 19m total
  • Illinois to Sydney
21/1
  • 21/1
  • 2 total stops
  • 30h 40m total
  • Illinois to Sydney
Highest demand for flights based on searches. 15% potential increase in price ($428 potential increase over avg. return price).
Cheapest flight prices on average. 4% potential price decrease ($96 potential savings vs. average return price).
Average for round-trip flights in September 2025

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 12 September 2025.

Mon 20/1009:44MDW - SYD
2 stops30h 21mMultiple Airlines
Sun 2/1114:05SYD - MDW
2 stops24h 58mMultiple Airlines
Deal found 10/9$1,553
Mon 27/1012:03MDW - SYD
2 stops28h 57mMultiple Airlines
Sun 9/1114:05SYD - MDW
2 stops24h 58mMultiple Airlines
Deal found 11/9$1,555
Fri 24/1015:15ORD - SYD
2 stops36h 30mAlaska Airlines
Fri 31/1021:40SYD - ORD
2 stops24h 42mAlaska Airlines
Deal found 10/9$1,627
Tue 4/1115:25ORD - SYD
2 stops35h 20mAlaska Airlines
Tue 18/1121:40SYD - ORD
1 stop35h 50mAlaska Airlines
Deal found 9/9$1,644
Mon 20/1012:28ORD - SYD
2 stops27h 37mMultiple Airlines
Sun 2/1114:05SYD - ORD
2 stops27h 06mMultiple Airlines
Deal found 10/9$1,663
Fri 7/1107:00STL - SYD
2 stops33h 50mQantas Airways
Sun 16/1114:05SYD - STL
1 stop20h 03mQantas Airways
Deal found 11/9$1,663
Mon 10/1106:30ORD - SYD
2 stops37h 00mMultiple Airlines
Thu 13/1114:00SYD - ORD
2 stops26h 00mMultiple Airlines
Deal found 10/9$1,666
Fri 28/1117:50STL - SYD
2 stops35h 05mQantas Airways
Sun 14/1214:05SYD - STL
1 stop20h 00mQantas Airways
Deal found 10/9$1,669
Thu 6/1117:53ORD - SYD
2 stops32h 52mAlaska Airlines
Sat 22/1121:40SYD - ORD
2 stops34h 13mAlaska Airlines
Deal found 10/9$1,689
Tue 21/1006:00ORD - SYD
2 stops32h 05mMultiple Airlines
Sat 15/1117:45SYD - ORD
1 stop22h 15mMultiple Airlines
Deal found 11/9$1,713
Thu 6/1118:13STL - SYD
2 stops35h 12mQantas Airways
Mon 17/1114:05SYD - STL
1 stop39h 32mQantas Airways
Deal found 11/9$1,719
Sat 18/1006:00ORD - SYD
2 stops33h 30mMultiple Airlines
Fri 14/1117:45SYD - ORD
1 stop22h 15mMultiple Airlines
Deal found 11/9$1,737

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 12 September 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

Mon 27/10

12:03-09:00

2 stops28h 57m

Sydney Kingsford Smith

Sun 9/11

14:05-22:03

2 stops24h 58m

$1,555

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 7/11

07:00-09:50

2 stops33h 50m

Sydney Kingsford Smith

Sun 16/11

14:05-17:08

1 stop20h 03m

$1,663

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/11

17:50-22:25

2 stops35h 35m

Sydney Kingsford Smith

Sun 14/12

14:05-19:27

1 stop22h 22m

$1,671

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 21/10

17:59-19:45

2 stops33h 46m

Sydney Kingsford Smith

Tue 28/10

21:40-16:30

2 stops34h 50m

$1,773

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Fri 14/11

15:25-19:45

2 stops35h 20m

Sydney Kingsford Smith

Sat 22/11

21:40-14:53

2 stops34h 13m

$1,775

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/11

07:00-19:45

2 stops43h 45m

Sydney Kingsford Smith

Sun 16/11

21:40-23:59

2 stops43h 19m

$1,778

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 4/11

07:00-19:45

2 stops43h 45m

Sydney Kingsford Smith

Sun 16/11

21:40-23:59

2 stops43h 19m

$1,778

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/11

16:14-19:45

2 stops58h 31m

Sydney Kingsford Smith

Sat 15/11

21:40-23:59

2 stops43h 19m

$1,791

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 26/10

16:05-08:35

2 stops48h 30m

Sydney Kingsford Smith

Sun 2/11

11:20-16:29

2 stops45h 09m

$1,820

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Wed 12/11

13:20-07:00

2 stops24h 40m

Sydney Kingsford Smith

Mon 1/12

11:50-11:59

2 stops41h 09m

$1,862

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 54 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, May is the cheapest month in which you can book a flight from Illinois to Sydney (average of $129). Flying from Illinois to Sydney in October is currently the most expensive (average of $171). 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 12 September 2025.

When flying from Illinois to Sydney, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost for a return flight 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?

    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 24h 40m. Qantas Airways provides one of the quickest options available for as low as $1,862. The distance between Illinois and Sydney is about 14676 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?

  • 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, May is the cheapest month in which you can book a flight from Illinois to Sydney (average of $129). Flying from Illinois to Sydney in October is currently the most expensive (average of $171). 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
Lithgow
Randwick
Bondi Beach
Coogee
Cronulla
Leura

Browse thousands of different options on Cheapflights for your next trip

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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 12 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,254Average$1,773FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Qantas AirwaysCheapest$1,318Average$1,417FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights

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