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Cheap flights from Illinois to Sydney from $865

ORD — SYD
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Illinois to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from Illinois to Sydney

Sat 14/1116:30 -
1 stop23h 00m
Fri 27/1110:40 -
2 stops26h 37m
Deal found 25/10$1,854
Thu 29/1007:00 -
2 stops34h 50m
Tue 10/1111:30 -
2 stops35h 35m
Deal found 27/10$1,858
Wed 11/1108:59 -
3 stops35h 41m
Fri 27/1114:00 -
3 stops27h 53m
Deal found 28/10$1,878
Fri 4/1215:30 -
1 stop25h 05m
Mon 7/1211:20 -
1 stop20h 17m
Deal found 26/10$1,880
Thu 31/1205:40 -
1 stop31h 45m
Thu 18/214:00 -
2 stops34h 05m
Deal found 28/10$1,881
Wed 25/1105:15 -
2 stops32h 10m
Wed 2/1211:10 -
2 stops30h 43m
Deal found 27/10$1,892
Tue 3/1108:59 -
2 stops28h 26m
Thu 26/1114:00 -
3 stops27h 53m
Deal found 26/10$1,895
Thu 26/1106:40 -
2 stops30h 45m
Thu 3/1209:10 -
1 stop30h 44m
Deal found 29/10$1,902
Wed 11/1108:59 -
2 stops28h 26m
Sat 14/1114:00 -
3 stops27h 21m
Deal found 28/10$1,905
Fri 11/1214:22 -
2 stops27h 13m
Mon 18/111:50 -
2 stops26h 43m
Deal found 26/10$1,908
Sat 28/1105:15 -
2 stops34h 45m
Sat 5/1207:05 -
3 stops34h 49m
Deal found 27/10$1,911

Find flight deals from Illinois to Sydney

Round-trip from

$1,847

One-way from

$865

Popular in

December

Cheapest in

February

Average price

$2,280
United Airlines
  • United Airlines
  • 13/11-21/11
  • 2 total stops
  • 41h 59m total
  • Illinois to Sydney
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23/2-31/12
  • 23/2-31/12
  • 3 total stops
  • 44h 54m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($116 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($77 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2026
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Illinois to Sydney that are best for you.

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Route

Depart

Return

Price

Cheapest return flight

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 1/12

06:00-06:25

2 stops31h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$925

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Fri 5/3

05:00-09:50

2 stops35h 50m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$932

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 10/11

06:29-09:50

2 stops34h 21m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$969

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Sun 15/11

18:45-09:50

2 stops46h 05m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$989
Fastest return journey

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 10/11

07:00-06:25

3 stops30h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,131

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Mon 28/12

20:15-19:25

2 stops54h 10m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,200

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Wed 23/12

06:00-06:25

2 stops31h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,212

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 12/1

11:45-19:25

2 stops38h 40m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,256

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 19/1

15:35-09:20

2 stops24h 45m

Sydney Kingsford Smith

Tue 26/1

13:20-20:01

2 stops23h 41m

$1,924

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Mon 8/2

20:15-19:25

2 stops54h 10m

Sydney Kingsford Smith

Fri 12/2

21:35-10:00

2 stops53h 25m

$2,164

Flights are sorted by cheapest return flights first.

Deals found on 26/10

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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

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, February is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,750). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,641). 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 for a return flight from Illinois to Sydney?

Airfare is typical for this route at the moment.
Illinois to Sydney flights typically cost between $1,237 and $2,039 in November.
The cheapest return price found within the last 5 days was $1,847 on United Airlines (13 Nov–21 Nov).

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 83 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Related info for your journey

  • 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 45m. United Airlines provides one of the quickest options available for as low as $1,924. 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, February is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,750). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,641). 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
Manly
Cronulla
Lithgow
Terrigal
Katoomba
Randwick
Leura
Bondi Beach
Coogee

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Illinois to Sydney

AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$2,248Average$2,315FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights

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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.

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