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Cheap flights from Illinois to Sydney from $782

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
8 Feb — 15 Feb1
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 9 January 2026.

Round-trip from

$1,412

One-way from

$782

Popular in

December

Cheapest in

March

Average price

$2,037
Qantas Airways
  • Qantas Airways
  • 24/1-31/1
  • 3 total stops
  • 67h 22m total
  • Illinois to Sydney
Search Deals
10/3
  • 10/3
  • 1 total stop
  • 43h 46m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($550 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($108 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 2026
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 9 January 2026.

Sun 1/218:40ORD - SYD
1 stop21h 20mQantas Airways
Sun 8/219:15SYD - ORD
2 stops41h 38mQantas Airways
Deal found 6/1$1,425
Wed 11/220:00ORD - SYD
2 stops31h 50mQantas Airways
Sat 28/211:20SYD - ORD
1 stop20h 33mQantas Airways
Deal found 7/1$1,427
Sun 8/213:15ORD - SYD
2 stops49h 20mQantas Airways
Tue 10/311:20SYD - ORD
1 stop19h 33mQantas Airways
Deal found 8/1$1,428
Sat 7/213:15ORD - SYD
2 stops49h 20mQantas Airways
Sat 14/211:20SYD - ORD
1 stop20h 33mQantas Airways
Deal found 8/1$1,436
Sun 15/306:38STL - SYD
1 stop34h 22mQantas Airways
Tue 24/317:50SYD - STL
2 stops37h 38mQantas Airways
Deal found 7/1$1,436
Sat 24/119:40ORD - SYD
1 stop41h 30mQantas Airways
Thu 29/119:15SYD - ORD
2 stops38h 34mQantas Airways
Deal found 7/1$1,446
Sat 21/216:45ORD - SYD
2 stops45h 50mQantas Airways
Sat 28/211:20SYD - ORD
1 stop23h 26mQantas Airways
Deal found 7/1$1,455
Sat 7/218:40ORD - SYD
2 stops43h 55mQantas Airways
Sat 21/211:20SYD - ORD
1 stop20h 33mQantas Airways
Deal found 8/1$1,491
Mon 26/114:15ORD - SYD
1 stop24h 10mQantas Airways
Mon 16/219:15SYD - ORD
2 stops36h 38mQantas Airways
Deal found 7/1$1,498
Sun 15/216:49ORD - SYD
2 stops47h 21mQantas Airways
Tue 24/221:25SYD - ORD
1 stop25h 13mQantas Airways
Deal found 8/1$1,500
Thu 5/218:40ORD - SYD
2 stops43h 55mQantas Airways
Sat 21/211:20SYD - ORD
1 stop27h 15mQantas Airways
Deal found 7/1$1,503
Fri 6/218:40ORD - SYD
1 stop21h 20mQantas Airways
Sat 14/219:15SYD - ORD
2 stops38h 22mQantas Airways
Deal found 7/1$1,516

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 9 January 2026.
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

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 19/1

14:15-09:00

1 stop25h 45m

Sydney Kingsford Smith

Mon 9/2

19:15-14:57

2 stops36h 42m

$1,427

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 21/2

06:38-09:10

2 stops57h 32m

Sydney Kingsford Smith

Sat 28/2

11:20-23:59

1 stop29h 39m

$1,436

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 15/3

06:38-09:00

1 stop34h 22m

Sydney Kingsford Smith

Tue 24/3

17:50-15:28

2 stops37h 38m

$1,436

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/6

06:36-13:15

2 stops39h 39m

Sydney Kingsford Smith

Mon 15/6

12:00-18:30

1 stop21h 30m

$1,762

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 6/4

16:05-07:20

2 stops48h 15m

Sydney Kingsford Smith

Sat 11/4

09:20-15:24

2 stops45h 04m

$1,780

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/3

16:05-08:35

2 stops47h 30m

Sydney Kingsford Smith

Sat 14/3

10:20-15:29

2 stops45h 09m

$1,780

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 12/4

16:05-07:20

2 stops48h 15m

Sydney Kingsford Smith

Sat 18/4

09:20-15:24

2 stops45h 04m

$1,780

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 11/2

15:23-06:55

1 stop22h 32m

Sydney Kingsford Smith

Wed 4/3

17:30-23:47

2 stops23h 17m

$1,794

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Mon 16/2

08:15-07:25

2 stops30h 10m

Sydney Kingsford Smith

Mon 2/3

11:20-23:54

2 stops29h 34m

$1,803

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

16:44-08:45

2 stops25h 01m

Sydney Kingsford Smith

Mon 18/5

09:55-22:26

2 stops27h 31m

$1,816

Flights are sorted by cheapest return flights first.

Deals found on 7/1

Showing 1-10 of 50 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 $295). Flying from Illinois to Sydney in December is currently the most expensive (average of $1,274). 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.

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 25h 45m. Qantas Airways provides one of the quickest options available for as low as $1,427. The distance between Illinois and Sydney is about 14851 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 $295). Flying from Illinois to Sydney in December is currently the most expensive (average of $1,274). 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
Penrith
Terrigal
Katoomba
Manly
Lithgow
Randwick
Coogee
Leura
Cronulla
Bondi Beach

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Top airline flying from Illinois to Sydney

Discover the top airline 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 9 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,304Average$2,361FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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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