$702+ Cheap flights 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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
Flights to Illinois in 2025
Find the latest flights to Illinois in 2025, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 647,157 searches and data was last updated on 8 July 2025.
Return from | $1,481 |
---|---|
One-way from | $702 |
Popular in | December |
Cheapest in | March |
Average price | $1,623 |
Find flights to Illinois
Browse one-way and return flights deals to Illinois on Cheapflights. Flight deals are based on user searches and were last updated on 8 July 2025
Explore Illinois
Find flight deals to Illinois
Cheapest flights to IllinoisExplore the most affordable flight options available to Illinois. Find the lowest fares based on data from user searches, with prices last updated on 8 July 2025.
Explore the most affordable flight options available to Illinois. Find the lowest fares based on data from user searches, with prices last updated on 8 July 2025.
Cheapflights Fare Finder
Locate flights to Illinois that fit your budget, with regularly updated fares and availability. In the last 7 days, Cheapflights users made a total of 647,157 searches and data was last updated on 8 July 2025.
Use the filters below to find and compare flights to Illinois that are best for you.
Fly from
Route
Depart
Return
Price
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Wed 20/8
11:50-05:40
2 stops32h 50m
Chicago O'Hare Intl
Wed 27/8
07:05-10:35
2 stops36h 30m
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Fri 8/8
10:25-15:50
1 stop20h 25m
Chicago O'Hare Intl
Thu 28/8
08:55-07:05
1 stop31h 10m
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Tue 11/11
11:45-18:50
2 stops24h 05m
Chicago O'Hare Intl
Sun 16/11
14:30-10:30
2 stops27h 00m
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Mon 18/8
12:10-20:22
1 stop23h 12m
Lambert-St Louis
Sat 8/11
06:15-09:00
1 stop33h 45m
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Sat 2/8
09:10-14:17
1 stop20h 07m
Chicago O'Hare Intl
Fri 15/8
11:45-07:05
1 stop28h 20m
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Sat 1/11
12:25-05:16
2 stops32h 51m
Chicago O'Hare Intl
Sat 15/11
16:25-20:15
1 stop34h 50m
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Mon 18/8
09:20-15:21
2 stops45h 01m
Lambert-St Louis
Sat 8/11
13:35-09:35
2 stops27h 00m
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Mon 18/8
09:25-23:23
2 stops28h 58m
Lambert-St Louis
Sat 8/11
10:45-08:30
2 stops28h 45m
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Thu 21/8
11:50-10:01
2 stops37h 11m
Lambert-St Louis
Thu 28/8
11:05-08:45
2 stops30h 40m
SydneyChicago
SYD - MDW
SYDMDW
Sydney Kingsford Smith
Fri 12/9
09:25-17:35
2 stops23h 10m
Chicago Midway
Sat 20/9
13:08-06:35
2 stops26h 27m
Best time to book a flight to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight to Illinois
How long is the flight to Illinois?
On average, a flight from Sydney to Illinois takes 22 hours 53 minutes. Flights to Illinois from other popular cities in Australia will vary in length. Below are a few examples of popular routes and their flight times.
When is the cheapest time to fly to Illinois?
Use this chart to determine the cheapest time to fly return from Sydney to Illinois. Price data was last updated on 16 December 2024.
Users looking for the lowest fares to Illinois should consider flying on Monday at midday, when prices are typically cheapest. Budget-minded travellers will want to avoid Sunday evenings, when prices are usually at their highest.
What are the most popular airlines that fly to Illinois?
The most popular airlines flying from Sydney to Illinois are Qantas Airways, Air Canada and United Airlines.
What are the cheapest airlines that fly to Illinois?
The cheapest airlines flying from Sydney to Illinois are Qantas Airways, American Airlines and Air Canada.
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 43.0 - 125.0 mm per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.
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 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).
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 8 July 2025.
Read through reviews of airlines serving the United States, such as ANA, Japan Airlines, andSingapore Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
Kenneth,July 2025
SFO - HND
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
Kenneth,July 2025
SFO - HND
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
Kenneth,July 2025
SFO - HND
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
Kenneth,July 2025
SFO - HND
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
Kenneth,July 2025
SFO - HND
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
Kenneth,July 2025
SFO - HND
FAQs about flying to Illinois
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How does Cheapflights help users find flights to Illinois?
Cheapflights helps you search for flights to Illinois via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.
Why should you use Cheapflights to find cheap flight tickets to Illinois?
Cheapflights helps you find that perfect flight to Illinois by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!
Can Cheapflights find flights to Illinois with no change fees?
Certainly. Search results for flights to Illinois shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.
Can Cheapflights notify me if prices for flights to Illinois become cheaper?
Yes! Start tracking prices for Illinois flights today and get alerted when prices change. To subscribe and begin receiving alerts, click the bell icon next to the flight deals above and provide your email address.