$65+ Cheap flights from Chicago (CHI) to Ontario
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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Chicago to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Chicago to Ontario
Keep the following information in mind while searching for Chicago to Ontario flight deals. Data was last updated January 18, 2026.
Most accurate provider | Mytrip 3 stars |
|---|---|
Most trusted provider | Mytrip 3 stars |
Round-trip from | $189 (Booking.com) |
One-way from | $65 (Trip.com) |
Popular in | January |
Cheapest in | September |
Average price | $309 |
Good round-trip deal | $235 or less |
Good one-way deal | $177 or less |
Find flight deals from Chicago to Ontario
Cheapest flights from Chicago to OntarioExplore the most affordable flight options available from Chicago to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 18, 2026.
Explore the most affordable flight options available from Chicago to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 18, 2026.
This Booking.com deal was found by Cheapflights users on 1/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Booking.com deal was found by Cheapflights users on 1/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Mytrip deal was found by Cheapflights users on 1/18. 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.
This oojo deal was found by Cheapflights users on 1/18. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Trip.com deal was found by Cheapflights users on 1/18. 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.
This Mytrip deal was found by Cheapflights users on 1/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 1/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 1/16. 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.
This Trip.com deal was found by Cheapflights users on 1/17. 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.
This Kiwi.com deal was found by Cheapflights users on 1/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This FlightHub deal was found by Cheapflights users on 1/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 1/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Cheapflights Fare Finder
Use the filters below to find and compare flights from Chicago to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
ChicagoMontreal
ORD - YUL
ORDYUL
Chicago O'Hare Intl
Fri 2/20
1:02 pm-7:48 pm
1 stop5h 46m
Montreal Pierre Elliott Trudeau Intl
Wed 2/25
4:45 pm-6:45 pm
Nonstop3h 00m
ChicagoMontreal
ORD - YUL
ORDYUL
Chicago O'Hare Intl
Thu 2/19
7:10 am-1:28 pm
1 stop5h 18m
Montreal Pierre Elliott Trudeau Intl
Tue 2/24
4:45 pm-6:45 pm
Nonstop3h 00m
ChicagoMontreal
ORD - YUL
ORDYUL
Chicago O'Hare Intl
Fri 2/6
6:05 am-1:28 pm
1 stop6h 23m
Montreal Pierre Elliott Trudeau Intl
Tue 2/10
4:45 pm-6:51 pm
Nonstop3h 06m
ChicagoMontreal
ORD - YUL
ORDYUL
Chicago O'Hare Intl
Sat 2/14
1:00 pm-9:42 pm
1 stop7h 42m
Montreal Pierre Elliott Trudeau Intl
Sat 2/21
6:00 am-8:00 am
Nonstop3h 00m
ChicagoMontreal
ORD - YUL
ORDYUL
Chicago O'Hare Intl
Fri 2/20
2:30 pm-9:42 pm
1 stop6h 12m
Montreal Pierre Elliott Trudeau Intl
Mon 2/23
4:45 pm-6:45 pm
Nonstop3h 00m
ChicagoToronto
MDW - YTZ
MDWYTZ
Chicago Midway
Fri 2/6
11:05 am-1:47 pm
Nonstop1h 42m
Toronto Island
Tue 2/10
9:20 am-10:10 am
Nonstop1h 50m
ChicagoToronto
MDW - YTZ
MDWYTZ
Chicago Midway
Fri 2/6
11:05 am-1:47 pm
Nonstop1h 42m
Toronto Island
Mon 2/9
9:20 am-10:10 am
Nonstop1h 50m
ChicagoMontreal
ORD - YUL
ORDYUL
Chicago O'Hare Intl
Tue 2/17
6:00 pm-9:17 pm
Nonstop2h 17m
Montreal Pierre Elliott Trudeau Intl
Sat 2/21
9:15 am-11:43 pm
1 stop15h 28m
ChicagoMontreal
ORD - YUL
ORDYUL
Chicago O'Hare Intl
Sat 2/7
5:52 pm-9:17 pm
Nonstop2h 25m
Montreal Pierre Elliott Trudeau Intl
Sun 2/8
7:00 am-12:05 pm
1 stop6h 05m
ChicagoToronto
MDW - YTZ
MDWYTZ
Chicago Midway
Mon 2/16
4:15 pm-6:57 pm
Nonstop1h 42m
Toronto Island
Thu 2/19
9:20 am-10:10 am
Nonstop1h 50m
Best time to book a flight from Chicago to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Chicago with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Chicago to Ontario
What is the cheapest month to book a flight from Chicago to Region of Ontario?
Currently, March is the cheapest month in which you can book a flight from Chicago to Region of Ontario (average of $79). Flying from Chicago to Region of Ontario in December is currently the most expensive (average of $211). 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 CHI to ON?
Find hourly flight availability from Chicago to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 18, 2026.
It’s optimal to fly from Chicago to Region of Ontario in the morning. By choosing this option you can save up to 25% on the cost of your flight, compared to a flight at noon.
What is the cheapest day to fly from Chicago to Region of Ontario?
Use this chart to determine the cheapest time to fly round-trip from Chicago to Ontario. Price data was last updated on January 10, 2026.
Travelers seeking maximum savings on their Chicago to Region of Ontario flight should consider departing on Monday mornings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Chicago to Region of Ontario
Explore weekly flight availability from Chicago to Ontario. 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 January 18, 2026.
The most flights from CHI to CAON are scheduled on a Friday (64 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (43 on average).
How much does it cost to fly round-trip from Chicago to Region of Ontario?
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated January 18, 2026.
See what other customers who have flown with Porter Airlines, Air Transat, and United Airlines from Chicago to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
Food
Crew
Comfort
Boarding
Entertainment
Reviews
Mohameed,Nov 2025
LAS - YYZ
Overall
Food
Crew
Comfort
Boarding
Entertainment
Reviews
Mohameed,Nov 2025
LAS - YYZ
Overall
Food
Crew
Comfort
Boarding
Entertainment
Reviews
Mohameed,Nov 2025
LAS - YYZ
Overall
Food
Crew
Comfort
Boarding
Entertainment
Reviews
Mohameed,Nov 2025
LAS - YYZ
Overall
Food
Crew
Comfort
Boarding
Entertainment
Reviews
Mohameed,Nov 2025
LAS - YYZ
Overall
Food
Crew
Comfort
Boarding
Entertainment
Reviews
Mohameed,Nov 2025
LAS - YYZ
Related info for your journey
Find useful and relevant information for your journey from Chicago to Ontario. 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 Chicago to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Top 4 airlines flying from Chicago to Ontario
Discover the top 4 airlines that operate flights from Chicago to Ontario. 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 January 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$257 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$139 | Average$404 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$172 | Average$348 | FlexibilityNo cancel fee | On-time52% | |
| Cheapest$217 | Average$376 | FlexibilityNo cancel fee | On-time71% |