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$622+ 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 2/10. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
1 adult, Economy
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Cheap 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 December 16, 2025.

This United Airlines deal was found by Cheapflights users on 12/16. 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.
Thu 12/2511:50 amSYD - ORD
1 stop22h 15mUnited Airlines
Wed 1/212:40 pmORD - SYD
1 stop22h 40mUnited Airlines
Deal found 12/16$1,149
This United Airlines deal was found by Cheapflights users on 12/14. 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.
Tue 12/1612:10 pmSYD - ORD
1 stop33h 50mUnited Airlines
Mon 1/121:00 pmORD - SYD
2 stops24h 20mUnited Airlines
Deal found 12/14$1,151
This United Airlines deal was found by Cheapflights users on 12/15. 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.
Thu 12/1811:50 amSYD - ORD
1 stop19h 50mUnited Airlines
Sat 1/310:10 pmORD - SYD
1 stop39h 10mUnited Airlines
Deal found 12/15$1,155
This United Airlines deal was found by Cheapflights users on 12/15. 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.
Wed 12/1711:50 amSYD - ORD
1 stop19h 51mUnited Airlines
Thu 1/2211:05 amORD - SYD
1 stop29h 10mUnited Airlines
Deal found 12/15$1,197
This United Airlines deal was found by Cheapflights users on 12/16. 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.
Thu 12/2511:50 amSYD - ORD
1 stop19h 50mUnited Airlines
Fri 1/237:58 pmORD - SYD
1 stop44h 17mUnited Airlines
Deal found 12/16$1,199
This United Airlines deal was found by Cheapflights users on 12/16. 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.
Sat 12/202:00 pmSYD - ORD
2 stops27h 14mUnited Airlines
Sat 1/109:01 amORD - SYD
2 stops28h 19mUnited Airlines
Deal found 12/16$1,249
This Virgin Australia deal was found by Cheapflights users on 12/15. 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 Virgin Australia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2311:20 amSYD - ORD
1 stop26h 05mVirgin Australia
Tue 1/1312:45 pmORD - SYD
1 stop24h 35mVirgin Australia
Deal found 12/15$1,351
This BestPriceTravel deal was found by Cheapflights users on 12/16. 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.
Sat 12/2011:20 amSYD - ORD
1 stop34h 17mVirgin Australia
Sat 1/108:10 pmORD - SYD
1 stop43h 55mVirgin Australia
Deal found 12/16$1,374
This United Airlines deal was found by Cheapflights users on 12/16. 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.
Thu 12/2512:10 pmSYD - ORD
2 stops23h 35mUnited Airlines
Fri 1/163:53 pmORD - SYD
1 stop22h 07mUnited Airlines
Deal found 12/16$1,462
This United Airlines deal was found by Cheapflights users on 12/14. 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.
Tue 12/162:00 pmSYD - ORD
2 stops23h 25mUnited Airlines
Wed 1/146:29 pmORD - SYD
1 stop21h 46mUnited Airlines
Deal found 12/14$1,626
This Delta deal was found by Cheapflights users on 12/16. 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 12/252:15 pmSYD - MDW
2 stops25h 07mDelta
Wed 1/2110:46 amMDW - SYD
2 stops28h 44mDelta
Deal found 12/16$1,676
This Delta deal was found by Cheapflights users on 12/16. 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 12/2510:40 amSYD - MDW
2 stops28h 42mDelta
Fri 1/231:26 pmMDW - SYD
2 stops26h 04mDelta
Deal found 12/16$1,726

Find flight deals from Sydney to Illinois

Keep the following information in mind while searching for Sydney to Illinois flight deals. Data was last updated December 16, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,069
(BYOjet)

One-way from

$622
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,463
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. 20% potential increase in price ($258 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($44 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 16, 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

Wed 1/28

11:20 am-3:29 pm

2 stops45h 09m

Lambert-St Louis

Wed 2/4

4:05 pm-9:35 am

2 stops48h 30m

$1,096

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 3/3

11:20 am-5:36 pm

1 stop23h 16m

Chicago O'Hare Intl

Tue 4/14

5:30 pm-7:05 am

1 stop22h 35m

$1,142

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 1/29

9:40 pm-1:54 pm

2 stops33h 14m

Lambert-St Louis

Thu 2/5

2:50 pm-7:45 pm

2 stops35h 55m

$1,160

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 2/18

11:20 am-8:26 pm

2 stops26h 06m

Lambert-St Louis

Sun 2/22

6:00 pm-9:35 am

2 stops46h 35m

$1,170

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 5/16

11:55 am-9:31 pm

2 stops24h 36m

Chicago O'Hare Intl

Sat 6/6

4:40 pm-8:45 am

2 stops25h 05m

$1,173

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 5/16

11:55 am-11:28 pm

2 stops26h 33m

Chicago O'Hare Intl

Sat 6/6

4:40 pm-8:45 am

2 stops25h 05m

$1,175

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 2/19

12:10 pm-2:45 pm

1 stop19h 35m

Chicago O'Hare Intl

Fri 3/6

2:26 pm-9:05 am

2 stops25h 39m

$1,201

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 6/11

11:50 am-5:05 am

2 stops32h 15m

Chicago O'Hare Intl

Thu 8/6

5:45 pm-9:25 am

1 stop24h 40m

$1,216

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 2/20

2:00 pm-10:52 pm

2 stops25h 52m

Chicago O'Hare Intl

Fri 3/6

6:20 pm-9:05 am

1 stop21h 45m

$1,251

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 3/3

11:20 am-8:00 am

2 stops37h 40m

Chicago O'Hare Intl

Tue 4/14

7:10 am-7:20 am

3 stops33h 10m

$1,359

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 54 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 $1,026). 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.

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 December 16, 2025.
Get a feel of what it's like to fly with Qantas Airways and United 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
946 reviews

Comfort

7.5

Food

7.0

Overall

7.5

Boarding

7.7

Crew

8.1

Entertainment

7.2

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.
Qantas Airways
7.5
Good
946 reviews
Qantas Airways
7.5
Good
946 reviews

Comfort

7.5

Food

7.0

Overall

7.5

Boarding

7.7

Crew

8.1

Entertainment

7.2

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.
United Airlines
7.4
Good
9,094 reviews
Qantas Airways
7.5
Good
946 reviews

Comfort

7.5

Food

7.0

Overall

7.5

Boarding

7.7

Crew

8.1

Entertainment

7.2

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.

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, American Airlines, and Air New Zealand fly from Sydney to Illinois in about 23h 16m. The time it takes to get you to your destination can typically vary by up to 21h 53m. 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?

    $372 is the cheapest one-way deal found within the past few days, from Qantas Airways. You may also be able to find cheap deals on American Airlines and Air Canada, with prices starting from $465 and $530, 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 $1,026). 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

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Top airline flying from Sydney to Illinois

Discover the top airline 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 December 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$631Average$762FlexibilityNo cancel feeOn-time74%

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