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$614+ Cheap flights from Sydney (SYD) to Illinois

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 11/26. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
Dec 1 — Dec 81
Mon 12/1
Mon 12/8
1 adult, Economy
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Find flight deals from Sydney to Illinois

Cheapest flights from Sydney to Illinois
Explore the most affordable flight options available from Sydney to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 1, 2025.

This Booking.com deal was found by Cheapflights users on 10/31. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1411:20 amSYD - ORD
1 stop20h 21mAir Canada
Mon 11/175:55 pmORD - SYD
2 stops46h 40mAir Canada
Deal found 10/31$863
This Trip.com deal was found by Cheapflights users on 10/31. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/145:45 pmSYD - ORD
1 stop22h 15mMultiple Airlines
Mon 11/176:30 amORD - SYD
1 stop31h 55mMultiple Airlines
Deal found 10/31$874
This Gotogate deal was found by Cheapflights users on 10/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2411:20 amSYD - STL
2 stops45h 09mAir Canada
Sun 11/304:05 pmSTL - SYD
2 stops48h 30mAir Canada
Deal found 10/30$915
This flugladen.de deal was found by Cheapflights users on 11/1. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/135:45 pmSYD - ORD
1 stop22h 15mMultiple Airlines
Wed 11/268:10 amORD - SYD
1 stop30h 15mMultiple Airlines
Deal found 11/1$918
This BestPriceTravel deal was found by Cheapflights users on 11/1. 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 BestPriceTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1611:20 amSYD - ORD
1 stop20h 21mAir Canada
Sun 11/308:15 pmORD - SYD
2 stops44h 20mAir Canada
Deal found 11/1$919
This BYOjet deal was found by Cheapflights users on 11/1. 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 BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/219:55 amSYD - ORD
2 stops30h 15mAir New Zealand
Sat 12/61:00 pmORD - SYD
2 stops26h 45mAir New Zealand
Deal found 11/1$933
This BYOjet deal was found by Cheapflights users on 10/31. 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 BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2011:45 amSYD - ORD
2 stops24h 45mAir New Zealand
Fri 12/52:35 pmORD - SYD
2 stops26h 55mAir New Zealand
Deal found 10/31$936
This BYOjet deal was found by Cheapflights users on 10/30. 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 BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1911:45 amSYD - ORD
2 stops24h 45mAir New Zealand
Thu 12/412:45 pmORD - SYD
2 stops28h 45mAir New Zealand
Deal found 10/30$941
This BestPriceTravel deal was found by Cheapflights users on 10/30. 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 BestPriceTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1211:20 amSYD - ORD
1 stop21h 35mQantas Airways
Mon 12/16:23 pmORD - SYD
1 stop21h 37mQantas Airways
Deal found 10/30$944
This American Airlines deal was found by Cheapflights users on 10/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2411:20 amSYD - STL
1 stop29h 22mAmerican Airlines
Sun 11/307:00 amSTL - SYD
1 stop33h 00mAmerican Airlines
Deal found 10/30$974
This Delta deal was found by Cheapflights users on 11/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1310:40 amSYD - MDW
2 stops24h 38mDelta
Wed 11/261:15 pmMDW - SYD
2 stops26h 15mDelta
Deal found 11/1$989
This United Airlines deal was found by Cheapflights users on 10/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2411:50 amSYD - STL
2 stops22h 49mUnited Airlines
Sun 11/3011:20 amSTL - SYD
1 stop26h 40mUnited Airlines
Deal found 10/30$991

Cheap flight deals from Sydney to Illinois

Keep the following information in mind while searching for Sydney to Illinois flight deals. Data was last updated November 1, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$863
(Booking.com)

One-way from

$614
(Jetabroad)

Popular in

December

Cheapest in

March

Average price

$1,155
Provider with most accurate pricing for Sydney Kingsford Smith-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sydney Kingsford Smith-Chicago (CHI) flights.
Search Deals
From Sydney Kingsford Smith to Illinois
Search Deals
One-way flight from Sydney Kingsford Smith to Illinois
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($269 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($42 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sydney to Illinois 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 November 1, 2025.
Use the filters below to find and compare flights from Sydney to Illinois that are best for you.

Fly from

Sydney

Fly to

Illinois

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 3/12

10:25 am-3:29 pm

2 stops45h 04m

Lambert-St Louis

Mon 3/16

4:05 pm-8:35 am

2 stops48h 30m

$877

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 11/24

11:20 am-3:29 pm

2 stops45h 09m

Lambert-St Louis

Sun 11/30

4:05 pm-9:35 am

2 stops48h 30m

$915

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 11/16

11:20 am-8:00 pm

2 stops49h 40m

Chicago O'Hare Intl

Sun 11/30

8:15 pm-9:35 am

2 stops44h 20m

$921

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 11/12

11:20 am-3:55 pm

1 stop21h 35m

Chicago O'Hare Intl

Mon 12/1

6:23 pm-9:00 am

1 stop21h 37m

$944

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 11/19

5:45 pm-5:30 pm

2 stops40h 45m

Chicago O'Hare Intl

Thu 12/4

6:50 am-7:25 am

1 stop31h 35m

$956

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 11/24

11:20 am-11:42 pm

1 stop29h 22m

Lambert-St Louis

Sun 11/30

7:00 am-9:00 am

1 stop33h 00m

$974

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Thu 11/13

10:40 am-6:18 pm

2 stops24h 38m

Chicago Midway

Wed 11/26

1:15 pm-8:30 am

2 stops26h 15m

$989

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 11/24

11:50 am-5:39 pm

2 stops22h 49m

Lambert-St Louis

Sun 11/30

11:20 am-7:00 am

1 stop26h 40m

$991

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 1/27

12:10 pm-2:53 pm

1 stop19h 43m

Chicago O'Hare Intl

Sat 1/31

9:05 pm-7:00 am

1 stop40h 55m

$992

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 11/21

11:20 am-4:58 pm

2 stops22h 38m

Chicago O'Hare Intl

Sat 12/6

9:08 pm-7:00 am

1 stop40h 52m

$1,038

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 45 results
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Best time to book a flight from Sydney to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Sydney 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 Sydney to Illinois

What is the cheapest month to book a flight from Sydney to Illinois?

Currently, September is the cheapest month in which you can book a flight from Sydney to Illinois (average of $620). Flying from Sydney to Illinois in December is currently the most expensive (average of $1,061). 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.

What is the cheapest time of day to fly from SYD to IL?

Find hourly flight availability from Sydney to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 1, 2025.

One of the essential ways to save on airfare from Sydney to Illinois is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 32% on airfare.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated November 1, 2025.
Get a feel of what it's like to fly with Qantas Airways, United Airlines, and American Airlines from Sydney to Illinois by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
926 reviews

Boarding

7.7

Comfort

7.5

Crew

8.2

Entertainment

7.2

Overall

7.5

Food

7.0

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
Qantas Airways
7.5
Good
926 reviews
Qantas Airways
7.5
Good
926 reviews

Boarding

7.7

Comfort

7.5

Crew

8.2

Entertainment

7.2

Overall

7.5

Food

7.0

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
United Airlines
7.4
Good
8,991 reviews
Qantas Airways
7.5
Good
926 reviews

Boarding

7.7

Comfort

7.5

Crew

8.2

Entertainment

7.2

Overall

7.5

Food

7.0

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
American Airlines
7.2
Good
11,030 reviews
Qantas Airways
7.5
Good
926 reviews

Boarding

7.7

Comfort

7.5

Crew

8.2

Entertainment

7.2

Overall

7.5

Food

7.0

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.

Related info for your journey

Find useful and relevant information for your journey from Sydney to Illinois. 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 from for flights from Sydney to Illinois?

    Sydney Kingsford Smith (SYD), located 4.6 mi from the city center, is the airport you fly out of when you book flights from Sydney to Illinois.

  • How long is the flight from Sydney to Illinois?

    Airlines like Air Canada, Qantas Airways, and American Airlines fly from Sydney to Illinois in about 21h 35m. The time it takes to get you to your destination can typically vary by up to 23h 29m. Sydney and Illinois are separated by a distance of 9228 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    $614 is the cheapest one-way deal found within the past few days, from Air New Zealand. You may also be able to find cheap deals on Air Canada and United Airlines, with prices starting from $752 and $769, respectively.

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

    The most popular flight routes from Sydney to Illinois are Sydney Kingsford Smith - Chicago O'Hare Intl, Sydney Kingsford Smith - Chicago Midway and Sydney Kingsford Smith - Lambert-St Louis.

  • Can I find deals for flights from Sydney to Illinois that include hotel bookings?

    Yes. In addition to deals on Sydney to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Sydney to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sydney to Illinois.

  • Can I find deals for business class flights from Sydney to Illinois?

    Yes. Cheapflights offers flight deals from Sydney to Illinois 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 Sydney to Illinois?

    Currently, September is the cheapest month in which you can book a flight from Sydney to Illinois (average of $620). Flying from Sydney to Illinois in December is currently the most expensive (average of $1,061). 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

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Alternative routes for Sydney to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Sydney to Illinois

Discover the top 2 airlines that operate flights from Sydney to Illinois. 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 November 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$631Average$762FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$884Average$1,129FlexibilityNo cancel feeOn-time71%

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