HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sydney

$521+ Cheap flights from Illinois to Sydney (SYD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
feb. 7 — feb. 141
sáb. 2/7
sáb. 2/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Sydney with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Illinois to Sydney

Keep the following information in mind while searching for Illinois to Sydney flight deals. Data was last updated enero 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$955
(oojo)

One-way from

$521
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,365
Provider with most accurate pricing for Chicago (CHI)-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Sydney Kingsford Smith flights.
Search Deals
From Illinois to Sydney Kingsford Smith
Search Deals
One-way flight from Illinois to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($246 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($49 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Find flight deals from Illinois to Sydney

Cheapest flights from Illinois to Sydney
Explore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 8, 2026.

This oojo deal was found by Cheapflights users on 1/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 1/247:40 pmORD - SYD
1 stop41h 30mQantas Airways
sáb. 1/317:05 amSYD - ORD
2 stops25h 52mQantas Airways
Deal found 1/6$946
This oojo deal was found by Cheapflights users on 1/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 1/266:40 pmORD - SYD
1 stop21h 20mQantas Airways
lun. 2/97:15 pmSYD - ORD
2 stops36h 42mQantas Airways
Deal found 1/6$955
This oojo deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 1/272:15 pmORD - SYD
2 stops48h 20mQantas Airways
lun. 2/211:20 amSYD - ORD
1 stop22h 29mQantas Airways
Deal found 1/7$956
This oojo deal was found by Cheapflights users on 1/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 2/81:15 pmORD - SYD
2 stops49h 20mQantas Airways
mar. 3/1011:20 amSYD - ORD
1 stop19h 33mQantas Airways
Deal found 1/8$957
This oojo deal was found by Cheapflights users on 1/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 2/16:40 pmORD - SYD
1 stop21h 20mQantas Airways
sáb. 2/77:15 pmSYD - ORD
2 stops38h 34mQantas Airways
Deal found 1/5$958
This oojo deal was found by Cheapflights users on 1/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 2/161:24 pmORD - SYD
2 stops38h 26mQantas Airways
dom. 3/2211:20 amSYD - ORD
1 stop21h 16mQantas Airways
Deal found 1/5$959
This oojo deal was found by Cheapflights users on 1/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 3/105:55 pmORD - SYD
2 stops34h 55mQantas Airways
mié. 3/1811:20 amSYD - ORD
1 stop21h 16mQantas Airways
Deal found 1/6$962
This oojo deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 3/156:38 amSTL - SYD
1 stop34h 22mQantas Airways
mar. 3/245:50 pmSYD - STL
2 stops37h 38mQantas Airways
Deal found 1/7$962
This oojo deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 1/247:40 pmORD - SYD
1 stop41h 30mQantas Airways
jue. 1/297:15 pmSYD - ORD
2 stops38h 34mQantas Airways
Deal found 1/7$969
This SmartFares deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 2/214:45 pmORD - SYD
2 stops45h 50mQantas Airways
sáb. 2/2811:20 amSYD - ORD
1 stop23h 26mQantas Airways
Deal found 1/7$975
This KAYAK deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 1/262:15 pmORD - SYD
1 stop24h 10mQantas Airways
lun. 2/167:15 pmSYD - ORD
2 stops36h 38mQantas Airways
Deal found 1/7$1,004
This oojo deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/56:40 pmORD - SYD
2 stops43h 55mQantas Airways
sáb. 2/2111:20 amSYD - ORD
1 stop27h 15mQantas Airways
Deal found 1/7$1,007

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Sydney that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated enero 8, 2026.
Use the filters below to find and compare flights from Illinois to Sydney that are best for you.

Fly from

Illinois

Fly to

Sydney

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

sáb. 2/28

2:58 pm-8:50 pm

2 stops36h 52m

Sydney Kingsford Smith

vie. 3/6

11:20 am-2:53 pm

1 stop20h 33m

$956

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

mar. 3/10

5:55 pm-8:50 pm

2 stops34h 55m

Sydney Kingsford Smith

dom. 3/22

11:20 am-2:53 pm

1 stop19h 33m

$962

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

sáb. 2/21

6:38 am-9:10 am

2 stops57h 32m

Sydney Kingsford Smith

sáb. 2/28

11:20 am-11:59 pm

1 stop29h 39m

$962

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

sáb. 2/21

6:38 am-9:00 am

1 stop33h 22m

Sydney Kingsford Smith

mié. 2/25

5:50 pm-3:28 pm

2 stops38h 38m

$962

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

dom. 3/15

6:38 am-9:00 am

1 stop34h 22m

Sydney Kingsford Smith

mar. 3/24

5:50 pm-3:28 pm

2 stops37h 38m

$962

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

mar. 3/31

5:01 am-7:30 am

2 stops34h 29m

Sydney Kingsford Smith

dom. 4/12

5:50 pm-3:58 pm

1 stop37h 08m

$1,145

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

sáb. 2/21

4:05 pm-9:35 am

2 stops48h 30m

Sydney Kingsford Smith

mié. 2/25

11:20 am-3:29 pm

2 stops45h 09m

$1,151

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

lun. 6/1

6:36 am-1:15 pm

2 stops39h 39m

Sydney Kingsford Smith

lun. 6/15

12:00 pm-6:30 pm

1 stop21h 30m

$1,181

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

lun. 4/6

4:05 pm-7:20 am

2 stops48h 15m

Sydney Kingsford Smith

sáb. 4/11

9:20 am-3:24 pm

2 stops45h 04m

$1,193

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

dom. 4/12

4:05 pm-7:20 am

2 stops48h 15m

Sydney Kingsford Smith

sáb. 4/18

9:20 am-3:24 pm

2 stops45h 04m

$1,193

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/5

Showing 1-10 of 52 results
1
2
3
...
6

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 round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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, August is the cheapest month in which you can book a flight from Illinois to Sydney (average of $198). Flying from Illinois to Sydney in December is currently the most expensive (average of $854). 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.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Sydney from Illinois?

    If you book a flight to Sydney from Illinois, you will be flying to Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 4.6 mi from the center of Sydney.

  • How long is the flight from Illinois to Sydney?

    There are many flights that can get you from Illinois to Sydney in 29h 50m. Fly via Qantas Airways, Air Canada, or Delta to get the fastest option. The distance from Illinois to Sydney is about 9234 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Illinois to Sydney one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $229. Users have also found prices from $304 and $396 on ANA and Qantas Airways, respectively.

  • What are the most popular routes from Illinois to Sydney?

    While some choose either Chicago Midway - Sydney Kingsford Smith or Lambert-St Louis - Sydney Kingsford Smith, Chicago O'Hare Intl - Sydney Kingsford Smith is the most popular route from Illinois to Sydney.

  • 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 vacation 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, August is the cheapest month in which you can book a flight from Illinois to Sydney (average of $198). Flying from Illinois to Sydney in December is currently the most expensive (average of $854). 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

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Manly
Coogee

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Sydney flights
Dallas/Fort Worth to Sydney flights
San Francisco to Sydney flights
John F Kennedy Intl to Sydney flights
Newark to Sydney flights
LaGuardia to Sydney flights
Honolulu to Sydney flights
Dulles Intl to Sydney flights
Hobby to Sydney flights
Seattle to Sydney flights
Ontario to Sydney flights
O'Hare Intl to Sydney flights
Boston to Sydney flights
Santa Ana to Sydney flights
George Bush Intcntl to Sydney flights
Atlanta to Sydney flights
Baltimore to Sydney flights
Reagan-National to Sydney flights
Minneapolis to Sydney flights
Midway to Sydney flights
Denver to Sydney flights
Philadelphia to Sydney flights
Sky Harbor Intl to Sydney flights
Detroit to Sydney flights
Miami to Sydney flights
Orlando to Sydney flights
Fort Lauderdale to Sydney flights
Raleigh to Sydney flights
Nashville to Sydney flights
Portland to Sydney flights
San Diego to Sydney flights
Love Field to Sydney flights
Tampa to Sydney flights
Salt Lake City to Sydney flights
Indianapolis to Sydney flights
Charlotte to Sydney flights
Cincinnati to Sydney flights
Austin to Sydney flights
Pittsburgh to Sydney flights
Memphis to Sydney flights
Las Vegas to Sydney flights
Oakland to Sydney flights
San Jose to Sydney flights
Des Moines to Sydney flights
Knoxville to Sydney flights
Sacramento to Sydney flights
Long Beach to Sydney flights
St. Louis to Sydney flights
San Antonio to Sydney flights
Cleveland to Sydney flights

Top 8 airlines flying from Illinois to Sydney

Discover the top 8 airlines that operate flights from Illinois to Sydney. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated enero 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$679Average$1,213FlexibilityNo cancel feeOn-time80%
American AirlinesCheapest$805Average$1,397FlexibilityNo cancel feeOn-time71%
Qantas AirwaysCheapest$811Average$899FlexibilityNo cancel feeOn-time74%
Fiji AirwaysCheapest$849Average$1,181FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$851Average$1,223FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$870Average$1,240FlexibilityNo cancel feeOn-time69%
DeltaCheapest$935Average$1,034FlexibilityNo cancel feeOn-timeN/A
Air New ZealandCheapest$1,282Average$1,501FlexibilityNo cancel feeOn-time78%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.