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>

$496 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

$902

Typical prices: $1,377-$1,509

Qantas Airways

Tue 3/3Tue 3/10

STL - SYD • 2 stops

Cheapest one-way

$496

Typical prices: $662-$898

Multiple Airlines

Sat 4/25

ORD - SYD • 3 stops

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

6:18 pm - 8:50 pm

STL

SYD

33h 32m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$902Qantas Airways

Mon, Mar 9 - Mon, Mar 16

6:50 pm - 8:50 pm

STL

SYD

34h 00m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$903Qantas Airways

Wed, Apr 15 - Sat, May 9

6:00 am - 7:30 am

ORD

SYD

34h 30m

1 stop

1:15 pm - 5:50 am

SYD

ORD

31h 35m

2 stops

$942Multiple Airlines

Tue, Mar 31 - Mon, Apr 13

7:29 pm - 7:30 am

ORD

SYD

44h 01m

1 stop

1:15 pm - 5:39 am

SYD

ORD

31h 24m

2 stops

$946Multiple Airlines

Wed, May 20 - Mon, May 25

7:30 am - 7:20 am

STL

SYD

32h 50m

2 stops

9:20 am - 12:06 pm

SYD

STL

41h 46m

2 stops

$1,107Air Canada

Wed, Mar 4 - Wed, Mar 11

4:05 pm - 9:35 am

STL

SYD

48h 30m

2 stops

10:20 am - 3:29 pm

SYD

STL

45h 09m

2 stops

$1,145Air Canada

Sat, Jul 11 - Fri, Aug 14

10:42 am - 6:55 am

PIA

SYD

29h 13m

2 stops

9:30 am - 7:04 pm

SYD

PIA

24h 34m

2 stops

$1,272United Airlines

Sat, Jul 11 - Fri, Aug 14

8:50 am - 7:00 am

PIA

SYD

31h 10m

2 stops

9:30 am - 7:04 pm

SYD

PIA

24h 34m

2 stops

$1,323United Airlines

Wed, Aug 5 - Sun, Aug 30

1:05 pm - 6:50 am

MDW

SYD

26h 45m

2 stops

9:15 am - 6:05 pm

SYD

MDW

23h 50m

2 stops

$1,387Delta

Tue, Feb 17 - Sun, Mar 15

9:50 am - 8:30 am

MDW

SYD

29h 40m

2 stops

9:40 am - 5:22 pm

SYD

MDW

23h 42m

2 stops

$1,388Delta

Useful Info

Low season	September
High season	December
Cheapest flight	$496

Best time to beat the crowds with an average 5% drop 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

$496 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