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Cheap flights from Illinois to Sydney from $881

ORD — SYD
9 Dec — 16 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

Sun 8/1106:29 -
2 stops34h 21m
Wed 18/1111:30 -
2 stops34h 32m
Deal found 5/11$1,893
Sun 8/1121:35 -
2 stops42h 00m
Wed 18/1109:55 -
2 stops26h 01m
Deal found 7/11$1,895
Sat 5/1206:21 -
3 stops56h 14m
Sat 12/1211:10 -
2 stops30h 44m
Deal found 7/11$1,940
Tue 1/1214:22 -
2 stops25h 13m
Wed 27/109:55 -
2 stops27h 45m
Deal found 8/11$1,947
Wed 2/1207:00 -
2 stops34h 35m
Mon 25/114:05 -
2 stops23h 33m
Deal found 8/11$1,957
Sat 12/1219:50 -
2 stops48h 00m
Wed 27/111:50 -
2 stops24h 05m
Deal found 8/11$1,964
Tue 1/1214:22 -
2 stops27h 13m
Sat 5/1219:25 -
2 stops42h 12m
Deal found 5/11$1,976
Mon 16/1105:30 -
2 stops34h 05m
Wed 25/1119:25 -
2 stops42h 12m
Deal found 6/11$1,977
Wed 2/1213:57 -
2 stops27h 38m
Sat 30/119:25 -
2 stops43h 34m
Deal found 8/11$1,985
Tue 22/1221:50 -
2 stops46h 00m
Sun 31/119:25 -
2 stops40h 30m
Deal found 6/11$1,996

Find flight deals from Illinois to Sydney

Round-trip from

$1,893

One-way from

$881

Popular in

December

Cheapest in

January

Average price

$2,148
1/3-18/3
  • 1/3-18/3
  • 3 total stops
  • 76h 05m total
  • Illinois to Sydney
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1/3-31/12
  • 1/3-31/12
  • 2 total stops
  • 45h 35m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($160 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($100 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 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

Wed 24/3

07:35-09:50

2 stops34h 15m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$894

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Wed 17/3

06:29-09:50

2 stops35h 21m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$894

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Thu 25/2

20:50-09:50

2 stops44h 00m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$946

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 2/2

08:00-06:25

2 stops29h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$949

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Thu 25/2

06:00-06:25

3 stops31h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,042

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Mon 22/2

05:40-16:15

2 stops41h 35m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,056
Fastest return journey

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Wed 18/11

09:30-06:25

3 stops27h 55m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,199

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Wed 13/1

11:45-19:25

2 stops38h 40m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,236

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Fri 25/12

07:00-06:25

3 stops30h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,275

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Sat 27/2

20:15-19:25

2 stops54h 10m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,337

Flights are sorted by cheapest return flights first.

Deals found on 7/11

Showing 1-10 of 22 resultsSorted by cheapest first
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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, January is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,837). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,987). 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 $1,866 and $2,124 in March.
The cheapest return price found within the last 5 days was $1,893 on Multiple Airlines (1 Mar–18 Mar).

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.

  • How long is the flight from Illinois to Sydney?

    A quick flight from Illinois to Sydney can take about 30h 07m. Qatar Airways provides one of the quickest options available for as low as $2,169. 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, January is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,837). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,987). 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
Katoomba
Terrigal
Lithgow
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$2,292Average$2,361FlexibilityNo 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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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.

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

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