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>

$524 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

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

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

Cheapest round-trip

$955

Overall average: $1,292

Qantas Airways

Sun 2/1Sun 2/8

ORD - SYD • 1 stop

Cheapest one-way

$524

Typical prices: $452-$990

Multiple Airlines

Tue 3/10

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

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to Sydney that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

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

Sun, Feb 1 - Sun, Feb 8

6:40 pm - 9:00 am

ORD

SYD

21h 20m1 stop

7:15 pm - 7:53 pm

SYD

ORD

41h 38m2 stops

$955Qantas Airways

Wed, Feb 11 - Sat, Feb 28

8:00 pm - 8:50 pm

ORD

SYD

31h 50m2 stops

11:20 am - 2:53 pm

SYD

ORD

20h 33m1 stop

$956Qantas Airways

Sun, Feb 8 - Tue, Mar 10

1:15 pm - 7:35 am

ORD

SYD

49h 20m2 stops

11:20 am - 2:53 pm

SYD

ORD

19h 33m1 stop

$957Qantas Airways

Wed, Mar 4 - Tue, Mar 10

2:45 pm - 9:35 am

STL

SYD

25h 50m2 stops

10:20 am - 3:29 pm

SYD

STL

45h 09m2 stops

$1,144Multiple Airlines

Wed, Mar 4 - Tue, Mar 10

2:45 pm - 9:35 am

STL

SYD

25h 50m2 stops

10:20 am - 3:29 pm

SYD

STL

45h 09m2 stops

$1,147Multiple Airlines

Mon, Apr 6 - Sat, Apr 11

4:05 pm - 7:20 am

STL

SYD

48h 15m2 stops

9:20 am - 3:24 pm

SYD

STL

45h 04m2 stops

$1,193Air Canada

Mon, May 4 - Mon, May 18

4:44 pm - 8:45 am

STL

SYD

25h 01m2 stops

9:55 am - 10:26 pm

SYD

STL

27h 31m2 stops

$1,217Air New Zealand

Mon, May 4 - Mon, May 18

1:00 pm - 7:20 am

STL

SYD

51h 20m3 stops

9:20 am - 8:05 pm

SYD

STL

25h 45m2 stops

$1,234Air Canada

Tue, May 26 - Wed, Jun 10

1:05 pm - 6:35 am

MDW

SYD

26h 30m2 stops

9:15 am - 6:05 pm

SYD

MDW

23h 50m2 stops

$1,469Delta

Mon, Jul 6 - Mon, Jul 27

1:00 pm - 6:35 am

MDW

SYD

26h 35m2 stops

9:15 am - 6:31 pm

SYD

MDW

24h 16m2 stops

$1,470Delta

Useful Info

Low season	January
High season	December
Cheapest flight	$524

Best time to beat the crowds but there is an average 19% increase in price.

Most popular time to fly with an average 50% 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

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in Sydney

Sydney (SYD)

SYD

$521 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