Cheap flights from Ontario to Illinois from C$ 177
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 21/4. Fares are subject to change and may not be available on all flights or dates of travel.
Cheap flight deals from Ontario to Illinois
Keep the following information in mind while searching for Ontario to Illinois flight deals. Data was last updated 31 March 2025.
Round-trip from | C$ 285 |
---|---|
One-way from | C$ 177 |
Popular in | December |
Cheapest in | April |
Average price | C$ 399 |
Good round-trip deal | C$ 275 or less |
Good one-way deal | C$ 171 or less |
Find flight deals from Ontario to Illinois
Cheapest flights from Ontario to IllinoisExplore the most affordable flight options available from Ontario to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 March 2025.
Explore the most affordable flight options available from Ontario to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 March 2025.
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario 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 629,999 searches. Data last updated 31 March 2025.
Use the filters below to find and compare flights from Ontario to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
TorontoChicago
YTZ - MDW
YTZMDW
Toronto Island
Wed 23/4
9:30 a.m.-10:20 a.m.
Nonstop1h 50m
Chicago Midway
Wed 30/4
11:15 a.m.-1:57 p.m.
Nonstop1h 42m
TorontoChicago
YYZ - ORD
YYZORD
Toronto Pearson Intl
Wed 14/5
10:00 a.m.-10:54 a.m.
Nonstop1h 54m
Chicago O'Hare Intl
Wed 21/5
8:25 p.m.-11:07 p.m.
Nonstop1h 42m
TorontoChicago
YTZ - ORD
YTZORD
Toronto Island
Thu 15/5
8:25 a.m.-2:47 p.m.
1 stop7h 22m
Chicago O'Hare Intl
Thu 22/5
2:07 p.m.-9:35 p.m.
1 stop6h 28m
TorontoChicago
YYZ - ORD
YYZORD
Toronto Pearson Intl
Thu 24/4
7:00 a.m.-8:03 a.m.
Nonstop2h 03m
Chicago O'Hare Intl
Sun 27/4
7:20 a.m.-1:39 p.m.
1 stop5h 19m
MontrealChicago
YUL - ORD
YULORD
Montreal Pierre Elliott Trudeau Intl
Sat 19/4
6:20 p.m.-8:00 p.m.
Nonstop2h 40m
Chicago O'Hare Intl
Sun 20/4
1:56 p.m.-9:41 p.m.
1 stop6h 45m
MontrealChicago
YUL - MDW
YULMDW
Montreal Pierre Elliott Trudeau Intl
Mon 21/4
10:45 a.m.-4:40 p.m.
1 stop6h 55m
Chicago Midway
Tue 29/4
5:35 p.m.-10:47 p.m.
1 stop4h 12m
TorontoChicago
YTZ - MDW
YTZMDW
Toronto Island
Wed 14/5
4:05 p.m.-4:54 p.m.
Nonstop1h 49m
Chicago Midway
Wed 21/5
9:40 a.m.-12:22 p.m.
Nonstop1h 42m
TorontoChicago
YYZ - ORD
YYZORD
Toronto Pearson Intl
Thu 24/4
9:00 a.m.-10:01 a.m.
Nonstop2h 01m
Chicago O'Hare Intl
Sun 27/4
9:02 a.m.-11:49 a.m.
Nonstop1h 47m
TorontoChicago
YTZ - MDW
YTZMDW
Toronto Island
Thu 1/5
3:35 p.m.-4:24 p.m.
Nonstop1h 49m
Chicago Midway
Sun 4/5
9:40 a.m.-12:22 p.m.
Nonstop1h 42m
MontrealChicago
YUL - ORD
YULORD
Montreal Pierre Elliott Trudeau Intl
Tue 22/4
9:15 a.m.-10:47 a.m.
Nonstop2h 32m
Chicago O'Hare Intl
Wed 23/4
1:56 p.m.-9:41 p.m.
1 stop6h 45m
Best time to book a flight from Ontario to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Ontario with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Illinois
What is the cheapest month to book a flight from Region of Ontario to Illinois?
Currently, January is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of C$ 261). Flying from Region of Ontario to Illinois in March is currently the most expensive (average of C$ 355). 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 ON to IL?
Find hourly flight availability from Ontario 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 31 March 2025.
When flying from Region of Ontario 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.
Weekly flight availability from Region of Ontario to Illinois
Explore weekly flight availability from Ontario to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 31 March 2025.
The most flights from CAON to USIL are scheduled on a Sunday (57 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (29 on average).
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 31 March 2025.
To help decide which airline to fly from Ontario to Illinois, see what other customers have to say about Alaska Airlines, Delta and Porter Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
Boarding
Crew
Entertainment
Overall
Comfort
Reviews
Cheri,Jan 2025
FAT - SEA
Food
Boarding
Crew
Entertainment
Overall
Comfort
Reviews
Cheri,Jan 2025
FAT - SEA
Food
Boarding
Crew
Entertainment
Overall
Comfort
Reviews
Cheri,Jan 2025
FAT - SEA
Food
Boarding
Crew
Entertainment
Overall
Comfort
Reviews
Cheri,Jan 2025
FAT - SEA
Food
Boarding
Crew
Entertainment
Overall
Comfort
Reviews
Cheri,Jan 2025
FAT - SEA
Food
Boarding
Crew
Entertainment
Overall
Comfort
Reviews
Cheri,Jan 2025
FAT - SEA
Related info for your journey
Find useful and relevant information for your journey from Ontario to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Ontario to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Top 5 airlines flying from Ontario to Illinois
Discover the top 5 airlines that operate flights from Ontario 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 629,999 searches. Data last updated 31 March 2025.
Fly with Cheapflights
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How does Cheapflights help users find flights from Ontario to Illinois?
Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Illinois. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.
Why should you use Cheapflights to find cheap flight tickets from Ontario to Illinois?
It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Ontario to Illinois.
Can Cheapflights find flights from Ontario to Illinois with no change fees?
Users can book flights with no change fees policies with our dedicated filters. Book flights from Ontario to Illinois flexibly with Cheapflights today.
Can Cheapflights notify me if prices for flights from Ontario to Illinois become cheaper?
Yes, Cheapflights offers price alerts on Ontario to Illinois flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.