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$499+ 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
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$1,046
(Trip.com)

One-way from

$499
(Trip.com)

Popular in

December

Cheapest in

March

Average price

$1,087
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. 19% potential increase in price ($250 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($51 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Trip.com deal was found by Cheapflights users on 6/12. 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.
Thu 8/141:15 pmSYD - ORD
2 stops24h 31mMultiple Airlines
Thu 9/46:20 amORD - SYD
2 stops38h 55mMultiple Airlines
Deal found 6/12$1,046
This Delta deal was found by Cheapflights users on 6/12. 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.
Mon 7/219:25 amSYD - MDW
2 stops23h 14mDelta
Mon 8/1812:43 pmMDW - SYD
2 stops26h 52mDelta
Deal found 6/12$1,093
This Delta deal was found by Cheapflights users on 6/12. 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.
Mon 7/219:25 amSYD - ORD
2 stops22h 25mDelta
Wed 8/202:15 pmORD - SYD
2 stops25h 20mDelta
Deal found 6/12$1,093
This FlightHub deal was found by Cheapflights users on 6/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/138:55 pmSYD - ORD
1 stop26h 45mANA
Thu 7/319:05 amORD - SYD
2 stops43h 10mANA
Deal found 6/12$1,098
This United Airlines deal was found by Cheapflights users on 6/11. 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 8/189:30 amSYD - STL
2 stops22h 01mUnited Airlines
Sat 11/84:35 pmSTL - SYD
1 stop21h 25mUnited Airlines
Deal found 6/11$1,129
This American Airlines deal was found by Cheapflights users on 6/12. 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
1 stop23h 32mAmerican Airlines
Mon 8/256:00 amORD - SYD
1 stop34h 05mAmerican Airlines
Deal found 6/12$1,129
This Delta deal was found by Cheapflights users on 6/11. 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.
Sun 6/229:25 amSYD - STL
2 stops37h 58mDelta
Sun 6/296:30 amSTL - SYD
2 stops33h 05mDelta
Deal found 6/11$1,146
This Aunt Betty deal was found by Cheapflights users on 6/12. 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 Aunt Betty is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/238:55 amSYD - ORD
2 stops29h 48mJapan Airlines
Tue 8/191:30 amORD - SYD
1 stop37h 50mJapan Airlines
Deal found 6/12$1,217
This Flighttix deal was found by Cheapflights users on 6/9. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/179:10 amSYD - ORD
1 stop21h 34mBritish Airways
Mon 7/2810:17 pmORD - SYD
1 stop41h 48mBritish Airways
Deal found 6/9$1,232
This Gotogate deal was found by Cheapflights users on 6/10. 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.
Wed 10/810:20 amSYD - ORD
2 stops27h 47mAir Canada
Thu 10/168:55 amORD - SYD
2 stops31h 25mAir Canada
Deal found 6/10$1,275
This Jettzy deal was found by Cheapflights users on 6/12. 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 Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/185:45 pmSYD - STL
1 stop20h 45mQantas Airways
Thu 7/316:14 amSTL - SYD
1 stop33h 51mQantas Airways
Deal found 6/12$1,279
This Mytrip deal was found by Cheapflights users on 6/10. 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.
Sat 7/261:45 pmSYD - STL
3 stops35h 07mMultiple Airlines
Sat 8/27:38 pmSTL - SYD
2 stops25h 07mMultiple Airlines
Deal found 6/10$1,282

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 June 12, 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

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 8/14

1:15 pm-10:46 pm

2 stops24h 31m

Chicago O'Hare Intl

Thu 9/4

6:20 am-12:15 pm

2 stops38h 55m

$1,046

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Mon 7/21

9:25 am-5:39 pm

2 stops23h 14m

Chicago Midway

Mon 8/18

12:43 pm-6:35 am

2 stops26h 52m

$1,093

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 7/21

9:25 am-4:50 pm

2 stops22h 25m

Chicago O'Hare Intl

Wed 8/20

2:15 pm-6:35 am

2 stops25h 20m

$1,093

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 8/4

8:55 pm-8:40 am

1 stop26h 45m

Chicago O'Hare Intl

Mon 8/25

8:20 pm-7:15 pm

2 stops31h 55m

$1,115

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/18

10:20 am-4:45 pm

1 stop21h 25m

Lambert-St Louis

Sat 11/8

11:10 am-7:00 am

1 stop26h 50m

$1,129

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 8/4

9:10 am-5:42 pm

1 stop23h 32m

Chicago O'Hare Intl

Mon 8/25

6:00 am-7:05 am

1 stop34h 05m

$1,129

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 6/22

9:25 am-8:23 am

2 stops37h 58m

Lambert-St Louis

Sun 6/29

6:30 am-6:35 am

2 stops33h 05m

$1,146

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 7/23

8:55 am-11:43 pm

2 stops29h 48m

Chicago O'Hare Intl

Tue 8/19

1:30 am-6:20 am

1 stop37h 50m

$1,217

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 7/17

9:10 am-3:44 pm

1 stop21h 34m

Chicago O'Hare Intl

Mon 7/28

10:17 pm-7:05 am

1 stop41h 48m

$1,232

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 10/8

10:20 am-10:07 pm

2 stops27h 47m

Chicago O'Hare Intl

Thu 10/16

8:55 am-8:20 am

2 stops31h 25m

$1,275

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 30 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, 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 June 12, 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.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 June 12, 2025.
Peruse reviews from past customers who have flown with Air Tahiti Nui, Korean Air and Japan Airlines from Sydney to Illinois to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.7

Food

7.8

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Air Tahiti Nui
8.7
Very good
64 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.7

Food

7.8

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Korean Air
8.4
Very good
1,088 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.7

Food

7.8

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Japan Airlines
8.3
Very good
1,490 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.7

Food

7.8

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
ANA
8.3
Very good
882 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.7

Food

7.8

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Delta
8.0
Very good
7,946 reviews
Air Tahiti Nui
8.7
Very good
64 reviews

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.7

Food

7.8

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

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?

    $760 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Air Canada and Delta, with prices starting from $793 and $864, 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, 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$631Average$762FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$884Average$1,296FlexibilityNo cancel feeOn-time71%

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