How does KAYAK find such low prices on flights from Illinois to Sydney?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Sydney.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Sydney?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sydney from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Illinois to Sydney?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sydney with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Sydney?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sydney from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$609 CHEAP FLIGHTS from Illinois to Sydney

Save 25% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Flight Deals

Cheap Flights from Illinois to Sydney

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from Illinois to Sydney

Fri, Nov 13 - Fri, Nov 20

6:28 pm - 8:30 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

21h 02m1 stop Los Angeles

10:40 am - 1:37 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

19h 57m1 stop Los Angeles

$1,300Delta

Thu, Nov 26 - Fri, Dec 4

5:00 pm - 8:30 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

22h 30m1 stop Los Angeles

10:40 am - 5:15 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

23h 35m1 stop Los Angeles

$1,300Delta

Fri, Nov 13 - Sat, Nov 21

6:20 pm - 9:20 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

22h 00m1 stop San Francisco

11:50 am - 2:49 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

19h 59m1 stop San Francisco

$1,300United Airlines

Thu, Nov 26 - Thu, Dec 3

1:30 pm - 9:20 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

26h 50m1 stop San Francisco

11:50 am - 2:39 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

19h 49m1 stop San Francisco

$1,300United Airlines

Mon, Nov 16 - Sat, Nov 21

3:30 pm - 8:40 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

48h 10m2 stops Vancouver Intl Brisbane

1:00 pm - 2:37 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

42h 37m2 stops Brisbane Vancouver Intl

$1,303Air Canada

Tue, Nov 17 - Sat, Nov 21

3:30 pm - 8:40 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

48h 10m2 stops Vancouver Intl Brisbane

3:00 pm - 2:37 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

40h 37m2 stops Brisbane Vancouver Intl

$1,303Air Canada

Mon, Jan 11 - Sun, Jan 24

10:05 am - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

30h 30m1 stop Toronto Pearson Intl

11:20 am - 8:04 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

25h 44m1 stop Vancouver Intl

$1,311Air New Zealand

Sat, Apr 3 - Sun, Apr 18

8:50 pm - 9:45 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

45h 55m2 stops Los Angeles Manila Ninoy Aquino Intl

11:35 am - 5:55 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

45h 20m1 stop Manila Ninoy Aquino Intl

$1,318Multiple Airlines

Mon, Jan 11 - Sun, Jan 24

8:45 am - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

31h 50m1 stop Toronto Pearson Intl

11:20 am - 5:43 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

23h 23m2 stops Vancouver Intl Toronto Pearson Intl

$1,319Air New Zealand

Fri, Mar 5 - Tue, Mar 9

10:45 pm - 9:50 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

42h 05m1 stop Manila Ninoy Aquino Intl

11:30 am - 4:55 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

46h 25m1 stop Manila Ninoy Aquino Intl

$1,320Philippine Airlines

Recent last minute flight deals from Illinois to Sydney

Tue, Nov 3 - Thu, Nov 26

8:59 am - 6:25 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

28h 26m2 stops Dallas/Fort Worth Los Angeles

2:00 pm - 12:53 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

27h 53m3 stops Nadi Los Angeles Denver Intl

$1,334Multiple Airlines

Tue, Nov 3 - Thu, Nov 26

8:59 am - 6:25 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

28h 26m2 stops Dallas/Fort Worth Los Angeles

2:00 pm - 6:14 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

33h 14m2 stops Nadi Los Angeles

$1,348Multiple Airlines

Sun, Nov 1 - Mon, Nov 16

3:30 pm - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

25h 05m1 stop Vancouver Intl

11:20 am - 2:37 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

20h 17m1 stop Vancouver Intl

$1,351Air Canada

Sun, Nov 1 - Mon, Nov 16

3:30 pm - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

25h 05m1 stop Vancouver Intl

11:20 am - 7:52 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

25h 32m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$1,356Air Canada

Sun, Nov 1 - Fri, Nov 13

6:55 am - 8:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

32h 40m2 stops Houston George Bush Intcntl Auckland Intl

11:50 am - 6:56 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

24h 06m2 stops Auckland Intl Los Angeles

$1,390Air New Zealand

Wed, Nov 4 - Sun, Nov 15

7:55 pm - 8:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

43h 40m2 stops Houston George Bush Intcntl Auckland Intl

7:30 am - 12:15 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

45h 45m2 stops Auckland Intl Los Angeles

$1,464Air New Zealand

Mon, Nov 2 - Mon, Nov 16

6:45 pm - 9:00 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

21h 15m1 stop Los Angeles

11:15 am - 5:00 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

22h 45m1 stop Los Angeles

$1,617Qantas Airways

Mon, Nov 2 - Mon, Nov 16

6:45 pm - 9:00 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

21h 15m1 stop Los Angeles

11:15 am - 5:00 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

22h 45m1 stop Los Angeles

$1,650Qantas Airways

Mon, Nov 2 - Mon, Nov 16

6:50 pm - 6:50 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

43h 00m1 stop Doha Hamad Intl

7:00 pm - 2:30 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

36h 30m2 stops Brisbane Doha Hamad Intl

$1,689Qatar Airways

Mon, Nov 2 - Tue, Dec 29

2:31 pm - 6:50 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

47h 19m2 stops New York John F Kennedy Intl Doha Hamad Intl

10:10 pm - 2:30 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

33h 20m1 stop Doha Hamad Intl

$3,759Qatar Airways

Useful Info

Low season	July
High season	December
Cheapest flight	$609

Best time to beat the crowds but there is an average 2% increase in price.

Most popular time to fly with an average 29% increase in price.

Flight from Chicago O'Hare Airport to Sydney

How does KAYAK find such low prices on flights from Illinois to Sydney?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Sydney.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Sydney?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sydney from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to Sydney?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sydney with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Sydney?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sydney from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Parramatta

Terrigal

Penrith

Katoomba

Coogee

Cronulla

Randwick

Leura

Lithgow

Charlestown

Swansea

Newport

Brooklyn

More options for your flight to Sydney

Add a hotel or car rental

Airports

Cabin class

Direct Flights

Origins

Other destinations

Return flight

Complete your trip to Sydney with a hotel stay or car rental

Car rentals in Sydney

SYD

$609 Find Cheap Flights from Illinois to Sydney - Compare and Save

Cheap Flights from Illinois to Sydney

Recent round-trip flight deals from Illinois to Sydney

Recent one-way flight deals from Illinois to Sydney

Recent last minute flight deals from Illinois to Sydney

Good to know

Low season

High season

Cheapest flight

FAQs for booking flights from Illinois to Sydney

Traveling to a place near Sydney?

More options for your flight to Sydney

Complete your trip to Sydney with a hotel stay or car rental

Information on the airport you'll fly into in Sydney

Cabin class types available on flights to Illinois

Find direct flights for Sydney

Flights from domestic origins to Sydney

Flights to other popular destinations

Find deals for your return flight