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Illinois

$388+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
Aug 6 — Aug 131
Wed 8/6
Wed 8/13
1 adult, Economy
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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 August 1, 2025.

Round-trip from

$814
(American Airlines)

One-way from

$388
(flugladen.de)

Popular in

December

Cheapest in

February

Average price

$1,101
From Sydney Kingsford Smith to Illinois
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One-way flight from Sydney Kingsford Smith to Illinois
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Highest demand for flights based on searches. 18% potential increase in price ($236 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($48 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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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 August 1, 2025.

This American Airlines deal was found by Cheapflights users on 7/31. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/189:10 amSYD - STL
2 stops24h 59mAmerican Airlines
Sat 11/83:59 pmSTL - SYD
2 stops24h 01mAmerican Airlines
Deal found 7/31$814
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Sun 9/149:30 amSYD - STL
2 stops24h 28mUnited Airlines
Sun 9/2111:05 amSTL - SYD
2 stops28h 50mUnited Airlines
Deal found 7/30$830
This Air Canada deal was found by Cheapflights users on 7/30. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/149:20 amSYD - STL
3 stops49h 37mAir Canada
Sun 9/211:30 pmSTL - SYD
2 stops26h 50mAir Canada
Deal found 7/30$941
This Qantas Airways deal was found by Cheapflights users on 7/30. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/49:10 amSYD - ORD
1 stop20h 07mQantas Airways
Mon 8/257:03 pmORD - SYD
1 stop21h 27mQantas Airways
Deal found 7/30$1,047
This BYOjet deal was found by Cheapflights users on 7/29. 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.
Sat 9/279:20 amSYD - ORD
1 stop25h 44mAir Canada
Tue 10/148:51 amORD - SYD
1 stop31h 29mAir Canada
Deal found 7/29$1,054
This American Airlines deal was found by Cheapflights users on 7/30. 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 8/49:10 amSYD - ORD
2 stops23h 10mAmerican Airlines
Mon 8/254:21 pmORD - SYD
2 stops26h 19mAmerican Airlines
Deal found 7/30$1,055
This Mytrip deal was found by Cheapflights users on 7/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/121:15 pmSYD - ORD
3 stops30h 34mMultiple Airlines
Fri 9/1911:48 amORD - SYD
3 stops32h 57mMultiple Airlines
Deal found 7/29$1,072
This United Airlines deal was found by Cheapflights users on 7/29. 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 9/69:30 amSYD - ORD
2 stops23h 56mUnited Airlines
Sun 10/57:10 amORD - SYD
1 stop32h 50mUnited Airlines
Deal found 7/29$1,073
This Air New Zealand deal was found by Cheapflights users on 7/30. 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 Air New Zealand is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/511:50 amSYD - ORD
2 stops26h 09mAir New Zealand
Tue 8/264:10 pmORD - SYD
2 stops25h 35mAir New Zealand
Deal found 7/30$1,147
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/129:40 pmSYD - ORD
2 stops30h 31mAlaska Airlines
Tue 10/710:05 amORD - SYD
2 stops41h 40mAlaska Airlines
Deal found 7/29$1,186
This Delta deal was found by Cheapflights users on 7/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/299:40 amSYD - MDW
2 stops24h 45mDelta
Sat 11/151:00 pmMDW - SYD
2 stops26h 30mDelta
Deal found 7/31$1,392
This Qantas Airways deal was found by Cheapflights users on 7/31. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1812:10 pmSYD - STL
2 stops21h 59mMultiple Airlines
Sat 11/83:59 pmSTL - SYD
3 stops27h 31mMultiple Airlines
Deal found 7/31$1,561

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 August 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

Mon 8/18

9:10 am-7:09 pm

2 stops24h 59m

Lambert-St Louis

Sat 11/8

3:59 pm-9:00 am

2 stops24h 01m

$814

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 9/14

10:20 am-4:53 pm

1 stop21h 33m

Lambert-St Louis

Sun 9/21

11:05 am-6:55 am

2 stops28h 50m

$830

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 9/14

9:20 am-7:57 pm

3 stops49h 37m

Lambert-St Louis

Sun 9/21

1:30 pm-7:20 am

2 stops26h 50m

$941

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 8/11

9:10 am-3:55 pm

1 stop21h 45m

Chicago O'Hare Intl

Wed 9/3

7:01 pm-7:05 am

1 stop21h 04m

$1,050

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 9/27

9:20 am-8:04 pm

1 stop25h 44m

Chicago O'Hare Intl

Tue 10/14

8:51 am-8:20 am

1 stop31h 29m

$1,054

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 9/6

9:10 am-9:22 pm

1 stop27h 12m

Chicago O'Hare Intl

Mon 10/6

10:10 am-8:05 am

1 stop29h 55m

$1,056

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 9/12

1:15 pm-4:49 am

3 stops30h 34m

Chicago O'Hare Intl

Fri 9/19

11:48 am-11:45 am

3 stops32h 57m

$1,072

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 9/6

9:30 am-2:35 pm

1 stop20h 05m

Chicago O'Hare Intl

Sat 10/4

9:13 pm-7:55 am

1 stop42h 42m

$1,073

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 9/12

9:40 pm-1:11 pm

2 stops30h 31m

Chicago O'Hare Intl

Tue 10/7

10:05 am-7:45 pm

2 stops41h 40m

$1,186

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Mon 1/12

10:40 am-6:34 pm

2 stops24h 54m

Chicago Midway

Sun 2/1

1:00 pm-8:30 am

2 stops26h 30m

$1,350

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 21 results
1
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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, August is the cheapest month in which you can book a flight from Sydney to Illinois (average of $245). Flying from Sydney to Illinois in March is currently the most expensive (average of $321). 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 August 1, 2025.

When flying from Sydney to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 August 1, 2025.
Get a feel of what it's like to fly with Korean Air, Alaska Airlines, and Delta 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.
Korean Air
8.4
Very good
1,121 reviews

Crew

8.7

Food

8.1

Boarding

8.5

Comfort

8.2

Entertainment

8.2

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Korean Air
8.4
Very good
1,121 reviews
Korean Air
8.4
Very good
1,121 reviews

Crew

8.7

Food

8.1

Boarding

8.5

Comfort

8.2

Entertainment

8.2

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Alaska Airlines
8.0
Very good
10,000 reviews
Korean Air
8.4
Very good
1,121 reviews

Crew

8.7

Food

8.1

Boarding

8.5

Comfort

8.2

Entertainment

8.2

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Delta
8.0
Very good
7,981 reviews
Korean Air
8.4
Very good
1,121 reviews

Crew

8.7

Food

8.1

Boarding

8.5

Comfort

8.2

Entertainment

8.2

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Qantas Airways
7.5
Good
887 reviews
Korean Air
8.4
Very good
1,121 reviews

Crew

8.7

Food

8.1

Boarding

8.5

Comfort

8.2

Entertainment

8.2

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Etihad Airways
7.4
Good
1,230 reviews
Korean Air
8.4
Very good
1,121 reviews

Crew

8.7

Food

8.1

Boarding

8.5

Comfort

8.2

Entertainment

8.2

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.

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.

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

    $642 is the cheapest one-way deal found within the past few days, from Etihad Airways. You may also be able to find cheap deals on American Airlines and Air Canada, with prices starting from $691 and $828, 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 Midway, Sydney Kingsford Smith - Chicago O'Hare Intl 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, August is the cheapest month in which you can book a flight from Sydney to Illinois (average of $245). Flying from Sydney to Illinois in March is currently the most expensive (average of $321). 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.

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Alternative routes for Sydney to Illinois

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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 August 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$631Average$762FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$884Average$1,296FlexibilityNo cancel feeOn-time71%

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