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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

$500 CHEAP FLIGHTS from Illinois to Sydney

SYD

KAYAK searches hundreds of travel sites at once for deals on flights to Sydney

...and more

Travelers love KAYAK

41,299,237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$898

Typical prices: $1,149-$1,437

Qantas Airways

Tue 3/3Tue 3/10

STL - SYD • 2 stops

Cheapest one-way

$500

Typical prices: $649-$1,029

Multiple Airlines

Tue 3/17

ORD - SYD • 1 stop

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to Sydney!

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

Tue, Mar 3 - Tue, Mar 10

4:13 pm - 8:50 pm

STL

SYD

35h 37m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$898Qantas Airways

Thu, Mar 19 - Wed, Mar 25

4:13 pm - 8:50 pm

STL

SYD

36h 37m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$899Qantas Airways

Fri, Feb 27 - Mon, Mar 9

6:38 am - 9:00 am

STL

SYD

33h 22m

1 stop

5:50 pm - 3:28 pm

SYD

STL

37h 38m

2 stops

$908Qantas Airways

Fri, May 15 - Thu, May 21

6:00 am - 7:30 am

ORD

SYD

34h 30m

1 stop

1:15 pm - 6:46 am

SYD

ORD

32h 31m

2 stops

$965Multiple Airlines

Mon, May 4 - Mon, May 18

1:00 pm - 7:20 am

STL

SYD

27h 20m

2 stops

9:20 am - 8:05 pm

SYD

STL

25h 45m

2 stops

$1,151Air Canada

Wed, Mar 11 - Wed, Mar 18

10:05 am - 8:35 am

STL

SYD

30h 30m

2 stops

10:20 am - 3:29 pm

SYD

STL

45h 09m

2 stops

$1,157Multiple Airlines

Sat, Jul 11 - Fri, Aug 14

10:42 am - 6:55 am

PIA

SYD

29h 13m

2 stops

10:20 am - 12:14 am

SYD

PIA

28h 54m

2 stops

$1,273United Airlines

Sat, Jul 11 - Fri, Aug 14

10:42 am - 6:55 am

PIA

SYD

29h 13m

2 stops

10:20 am - 12:14 am

SYD

PIA

28h 54m

2 stops

$1,324United Airlines

Wed, Mar 4 - Wed, Apr 15

12:45 pm - 8:30 am

MDW

SYD

26h 45m

2 stops

9:15 am - 6:36 pm

SYD

MDW

24h 21m

2 stops

$1,387Delta

Sun, Feb 22 - Fri, Mar 6

12:45 pm - 6:50 am

MDW

SYD

25h 05m

2 stops

10:40 am - 5:45 pm

SYD

MDW

24h 05m

2 stops

$1,437Delta

Useful Info

Low season	January
High season	December
Cheapest flight	$500

Best time to beat the crowds but there is an average 10% increase in price.

Most popular time to fly with an average 46% 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

Lithgow

Charlestown

Swansea

Brooklyn

Newport

Everything you need to know for your flight to Sydney

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Cabin class

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Direct Flights

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Return flight deals

Information on the airport you'll fly into in Sydney

Sydney (SYD)

SYD

$500 Find Cheap Flights from Illinois to Sydney

KAYAK searches hundreds of travel sites at once for deals on flights to Sydney

Everything you should know

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

FAQs for booking flights from Illinois 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.

Traveling to a place near Sydney?

Everything you need to know for your flight to Sydney

Information on the airport you'll fly into in Sydney

Cabin class types available on flights to Illinois

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

Find direct flights for Sydney

Flights to other popular destinations

Flights from domestic origins to Sydney

Choose which airport to fly into in Sydney

Find deals for your return flight