HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$80+ Cheap flights from Illinois 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 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — YYZ
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois 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 Illinois to Ontario

Keep the following information in mind while searching for Illinois to Ontario flight deals. Data was last updated June 12, 2025.

Round-trip from

$171
(Trip.com)

One-way from

$80
(Kiwi.com)

Popular in

November

Cheapest in

July

Average price

$280

Good round-trip deal

$188 or less

Good one-way deal

$91 or less
From Illinois to Ontario
Search Deals
One-way flight from Illinois to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals
Price to beat on a round-trip flight from Illinois to Ontario.
Search Deals
Price to beat on a one-way flight from Illinois to Ontario.
Search Deals

Find flight deals from Illinois to Ontario

Cheapest flights from Illinois to Ontario
Explore the most affordable flight options available from Illinois to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/189:15 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Wed 9/243:35 pmYTZ - MDW
Nonstop1h 49mPorter Airlines
Deal found 6/10$170
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/292:00 pmORD - YYZ
Nonstop1h 43mAir Canada
Wed 10/14:40 pmYYZ - ORD
Nonstop1h 53mAir Canada
Deal found 6/12$173
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/189:31 pmORD - YYZ
1 stop11h 33mUnited Airlines
Wed 9/245:15 pmYYZ - ORD
Nonstop1h 57mUnited Airlines
Deal found 6/10$177
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.
Tue 6/249:40 amMDW - YTZ
Nonstop1h 42mMultiple Airlines
Thu 6/267:55 amYTZ - MDW
Nonstop1h 50mMultiple Airlines
Deal found 6/12$197
This lastminute.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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2910:40 amORD - YTZ
1 stop5h 05mAir Canada
Wed 10/110:25 amYTZ - ORD
1 stop5h 30mAir Canada
Deal found 6/12$202
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.
Tue 7/156:00 amORD - YYZ
1 stop5h 05mAmerican Airlines
Tue 7/153:45 pmYYZ - ORD
1 stop6h 46mAmerican Airlines
Deal found 6/12$206
This SmartFares 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/139:40 amMDW - YTZ
Nonstop1h 40mAir Transat
Sat 8/167:55 amYTZ - MDW
Nonstop1h 50mAir Transat
Deal found 6/11$216
This Kissandfly.com 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/269:25 pmORD - YYZ
1 stop10h 54mMultiple Airlines
Sat 8/29:45 amYYZ - ORD
1 stop7h 48mMultiple Airlines
Deal found 6/11$232
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.
Tue 9/236:00 amORD - YYZ
1 stop4h 29mDelta
Wed 10/12:40 pmYYZ - ORD
1 stop5h 37mDelta
Deal found 6/11$234
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.
Tue 9/235:59 pmMDW - YYZ
1 stop3h 59mDelta
Tue 9/303:59 pmYYZ - MDW
1 stop3h 37mDelta
Deal found 6/11$234
This Atrapalo 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 Atrapalo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/185:20 pmMDW - YTZ
Nonstop1h 42mAPG Airlines
Sun 7/207:55 amYTZ - MDW
Nonstop1h 50mAPG Airlines
Deal found 6/11$242
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.
Thu 7/249:40 amMDW - YOW
1 stop8h 13mPorter Airlines
Tue 7/299:35 amYOW - MDW
1 stop7h 49mPorter Airlines
Deal found 6/12$255

Cheapflights Fare Finder

Customize your flight search to find flights from Illinois to Ontario 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 Illinois to Ontario that are best for you.

Fly from

Illinois

Fly to

Ontario

Route

Depart

Return

Price

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Thu 9/18

9:15 am-11:57 am

Nonstop1h 42m

Toronto Island

Wed 9/24

3:35 pm-4:24 pm

Nonstop1h 49m

$170

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Mon 9/29

2:00 pm-4:43 pm

Nonstop1h 43m

Toronto Pearson Intl

Wed 10/1

4:40 pm-5:33 pm

Nonstop1h 53m

$173

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Thu 9/18

9:31 pm-10:04 am

1 stop11h 33m

Toronto Pearson Intl

Wed 9/24

5:15 pm-6:12 pm

Nonstop1h 57m

$177

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Tue 6/24

9:40 am-12:22 pm

Nonstop1h 42m

Toronto Island

Thu 6/26

7:55 am-8:45 am

Nonstop1h 50m

$197

ChicagoToronto

ORD - YTZ

ORDYTZ

Chicago O'Hare Intl

Mon 9/29

10:40 am-4:45 pm

1 stop5h 05m

Toronto Island

Wed 10/1

10:25 am-2:55 pm

1 stop5h 30m

$202

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Tue 7/15

6:00 am-12:05 pm

1 stop5h 05m

Toronto Pearson Intl

Tue 7/15

3:45 pm-9:31 pm

1 stop6h 46m

$206

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Wed 8/13

9:40 am-12:20 pm

Nonstop1h 40m

Toronto Island

Sat 8/16

7:55 am-8:45 am

Nonstop1h 50m

$216

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Sat 7/26

9:25 pm-9:19 am

1 stop10h 54m

Toronto Pearson Intl

Sat 8/2

9:45 am-4:33 pm

1 stop7h 48m

$232

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Tue 9/23

7:00 am-11:29 am

1 stop3h 29m

Toronto Pearson Intl

Fri 9/26

3:59 pm-6:38 pm

1 stop3h 39m

$234

ChicagoToronto

MDW - YYZ

MDWYYZ

Chicago Midway

Tue 9/2

9:30 am-5:23 pm

1 stop6h 53m

Toronto Pearson Intl

Tue 9/9

12:14 pm-6:37 pm

1 stop7h 23m

$234

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Illinois to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Illinois 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 Illinois to Ontario

What is the cheapest month to book a flight from Illinois to Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from Illinois to Region of Ontario (average of $243). Flying from Illinois to Region of Ontario in July is currently the most expensive (average of $353). 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 IL to ON?

Find hourly flight availability from Illinois 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 June 12, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Region of Ontario as you normally would.

Weekly flight availability from Illinois to Region of Ontario

Explore weekly flight availability from Illinois 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 June 12, 2025.

The most flights from USIL to CAON are scheduled on a Thursday (62 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (27 on average).

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Region of Ontario, 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 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

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 June 12, 2025.
Read through reviews of airlines operating flights from Illinois to Ontario, such as Japan Airlines, Porter Airlines and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Japan Airlines
8.3
Very good
1,490 reviews

Entertainment

7.8

Overall

8.3

Boarding

8.4

Food

7.7

Crew

8.7

Comfort

8.2

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.
Japan Airlines
8.3
Very good
1,490 reviews
Japan Airlines
8.3
Very good
1,490 reviews

Entertainment

7.8

Overall

8.3

Boarding

8.4

Food

7.7

Crew

8.7

Comfort

8.2

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.
Porter Airlines
8.0
Very good
288 reviews
Japan Airlines
8.3
Very good
1,490 reviews

Entertainment

7.8

Overall

8.3

Boarding

8.4

Food

7.7

Crew

8.7

Comfort

8.2

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.
Delta
8.0
Very good
7,946 reviews
Japan Airlines
8.3
Very good
1,490 reviews

Entertainment

7.8

Overall

8.3

Boarding

8.4

Food

7.7

Crew

8.7

Comfort

8.2

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.
Air Transat
7.8
Good
396 reviews
Japan Airlines
8.3
Very good
1,490 reviews

Entertainment

7.8

Overall

8.3

Boarding

8.4

Food

7.7

Crew

8.7

Comfort

8.2

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.
United Airlines
7.4
Good
8,790 reviews
Japan Airlines
8.3
Very good
1,490 reviews

Entertainment

7.8

Overall

8.3

Boarding

8.4

Food

7.7

Crew

8.7

Comfort

8.2

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Illinois to Region of Ontario one-way?

    $80 is the cheapest one-way deal found within the past few days, from Porter Airlines. You may also be able to find cheap deals on Air Canada and United Airlines, with prices starting from $80 and $83, respectively.

  • Can I find deals for flights from Illinois to Ontario that include hotel bookings?

    Yes. In addition to deals on Illinois to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Ontario.

  • Can I find deals for business class flights from Illinois to Ontario?

    Yes. Cheapflights offers flight deals from Illinois to Ontario 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 Illinois to Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from Illinois to Region of Ontario (average of $243). Flying from Illinois to Region of Ontario in July is currently the most expensive (average of $353). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Newark to Pearson Intl flights
Newark to Toronto Island flights
John F Kennedy Intl to Pearson Intl flights
Los Angeles to Vancouver Intl flights
John F Kennedy Intl to Pierre Elliott Trudeau Intl flights
LaGuardia to Pierre Elliott Trudeau Intl flights
John F Kennedy Intl to Vancouver Intl flights
Newark to Vancouver Intl flights
Newark to Pierre Elliott Trudeau Intl flights
Los Angeles to Pearson Intl flights
LaGuardia to Pearson Intl flights
John F Kennedy Intl to Calgary flights
O'Hare Intl to Vancouver Intl flights
Newark to Calgary flights
San Francisco to Vancouver Intl flights
Dallas/Fort Worth to Pearson Intl flights
Dulles Intl to Pearson Intl flights
Boston to Pearson Intl flights
San Francisco to Pearson Intl flights
Denver to Vancouver Intl flights
Reagan-National to Pearson Intl flights
San Francisco to Calgary flights
Seattle to Pearson Intl flights
Boston to Vancouver Intl flights
Dulles Intl to Pierre Elliott Trudeau Intl flights
Los Angeles to Calgary flights
Atlanta to Vancouver Intl flights
O'Hare Intl to Pearson Intl flights
Reagan-National to Pierre Elliott Trudeau Intl flights
O'Hare Intl to Calgary flights
LaGuardia to Vancouver Intl flights
Dulles Intl to Vancouver Intl flights
Seattle to Calgary flights
Dallas/Fort Worth to Vancouver Intl flights
O'Hare Intl to Pierre Elliott Trudeau Intl flights
Hobby to Pearson Intl flights
Dulles Intl to Calgary flights
Hobby to Vancouver Intl flights
Los Angeles to Pierre Elliott Trudeau Intl flights
Sky Harbor Intl to Vancouver Intl flights
Minneapolis to Vancouver Intl flights
Fort Lauderdale to Pierre Elliott Trudeau Intl flights
Austin to Vancouver Intl flights
Detroit to Vancouver Intl flights
San Francisco to Pierre Elliott Trudeau Intl flights
Minneapolis to Calgary flights
Fort Lauderdale to Pearson Intl flights
Los Angeles to Abbotsford flights
San Diego to Vancouver Intl flights
Santa Ana to Vancouver Intl flights

Top 4 airlines flying from Illinois to Ontario

Discover the top 4 airlines that operate flights from Illinois 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapest$109Average$332FlexibilityNo cancel feeOn-time52%
Air CanadaCheapest$117Average$327FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$136Average$486FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$162Average$371FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.