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Cheap flights from Illinois to Sydney from $708

ORD — SYD
1 Nov — 8 Nov1
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 7/1117:15 -
2 stops48h 20m
Sun 15/1114:05 -
2 stops32h 15m
Deal found 28/9$1,857
Wed 14/1020:30 -
2 stops44h 30m
Sat 17/1011:15 -
2 stops34h 25m
Deal found 30/9$1,862
Wed 28/1014:40 -
2 stops27h 55m
Wed 4/1109:55 -
2 stops27h 27m
Deal found 30/9$1,863
Mon 9/1109:21 -
2 stops32h 14m
Tue 17/1119:25 -
2 stops40h 31m
Deal found 29/9$1,870
Tue 27/1020:05 -
2 stops44h 30m
Tue 10/1109:55 -
2 stops27h 40m
Deal found 29/9$1,880
Tue 27/1006:30 -
2 stops31h 55m
Tue 3/1111:15 -
2 stops30h 06m
Deal found 29/9$1,882
Sun 1/1106:29 -
2 stops34h 21m
Sun 8/1111:30 -
1 stop46h 25m
Deal found 2/10$1,885
Sun 1/1105:30 -
2 stops35h 20m
Sun 15/1111:30 -
1 stop46h 25m
Deal found 30/9$1,886
Mon 19/1006:00 -
2 stops35h 00m
Sun 1/1111:30 -
2 stops35h 29m
Deal found 2/10$1,887
Sun 1/1109:21 -
2 stops30h 14m
Sun 8/1119:25 -
2 stops42h 12m
Deal found 1/10$1,889
Sun 25/1006:55 -
2 stops33h 40m
Sun 8/1107:30 -
2 stops31h 10m
Deal found 29/9$1,890
Mon 26/1006:00 -
2 stops35h 50m
Mon 2/1111:30 -
2 stops34h 32m
Deal found 2/10$1,896

Find flight deals from Illinois to Sydney

Round-trip from

$1,844

One-way from

$708

Popular in

December

Cheapest in

February

Average price

$2,311
Air New Zealand
  • Air New Zealand
  • 1/2-3/3
  • 4 total stops
  • 53h 10m total
  • Illinois to Sydney
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24/10-31/12
  • 24/10-31/12
  • 1 total stop
  • 42h 24m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($71 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($40 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

Mon 2/11

14:10-10:45

2 stops51h 35m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$979

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

$989

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Sat 14/11

21:04-09:50

2 stops67h 46m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,008

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Fri 30/10

06:00-09:50

2 stops35h 50m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,045

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Sun 1/11

06:30-19:45

3 stops44h 15m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,051
Fastest return journey

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 10/11

07:20-06:25

3 stops30h 05m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,204

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Fri 20/11

07:26-19:45

2 stops43h 19m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,317

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Mon 21/12

19:34-19:45

2 stops55h 11m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,529

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Mon 19/10

06:00-09:00

2 stops35h 00m

Sydney Kingsford Smith

Sun 1/11

11:30-06:02

2 stops34h 32m

$1,898

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 20/10

06:00-09:00

2 stops35h 00m

Sydney Kingsford Smith

Thu 5/11

11:30-05:02

2 stops34h 32m

$1,898

Flights are sorted by cheapest return flights first.

Deals found on 30/9

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 $1,771). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,541). 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 $1,651 and $2,525 in February.
The cheapest return price found within the last 5 days was $1,844 on Air New Zealand (3 Feb–21 Feb).

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 84 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.

  • 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 $1,771). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,541). 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
Lithgow
Cronulla
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$2,278Average$2,346FlexibilityNo 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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Yes! Cheapflights helps users easily find flights from Illinois to Sydney with no change fees.

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