HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$83+ 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 12/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — YYZ
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
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 October 30, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$188
(Kiwi.com)

One-way from

$83
(iWofly)

Popular in

January

Cheapest in

September

Average price

$299

Good round-trip deal

$257 or less

Good one-way deal

$186 or less
Provider with most accurate pricing for Chicago (CHI)-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Toronto (YTO) flights.
Search Deals
From Illinois to Ontario
Search Deals
One-way flight from Illinois to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($35 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Wed 11/1911:00 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Sat 11/2211:00 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 10/29$188
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Wed 11/1211:00 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Sun 11/169:15 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 10/28$190
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Fri 12/54:15 pmMDW - YTZ
Nonstop1h 42mPorter Airlines
Sun 12/79:15 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 10/28$191
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Mon 12/811:00 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Thu 12/119:15 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 10/27$192
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Wed 11/1211:00 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Thu 11/132:30 pmYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 10/29$193
This Kiwi.com deal was found by Cheapflights users on 10/30. 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.
Thu 11/1311:00 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Sun 11/169:15 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 10/30$194
This American Airlines deal was found by Cheapflights users on 10/28. 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.
Sat 12/67:10 amORD - YYZ
1 stop10h 18mAmerican Airlines
Sun 12/76:00 amYYZ - ORD
Nonstop2h 15mAmerican Airlines
Deal found 10/28$194
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Thu 11/1311:00 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Fri 11/142:30 pmYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 10/28$196
This Trip.com deal was found by Cheapflights users on 10/30. 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.
Sun 11/1611:00 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Thu 11/202:30 pmYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 10/30$198
This Trip.com deal was found by Cheapflights users on 10/27. 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.
Wed 11/1211:00 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Wed 11/199:15 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 10/27$200
This American Airlines deal was found by Cheapflights users on 10/28. 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.
Fri 12/59:39 amORD - YYZ
Nonstop1h 51mAmerican Airlines
Sun 12/76:00 amYYZ - ORD
1 stop6h 03mAmerican Airlines
Deal found 10/28$200
This Flightnetwork deal was found by Cheapflights users on 10/29. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/58:15 pmORD - YYZ
Nonstop1h 39mAir Canada
Sun 12/77:00 amYYZ - ORD
1 stop5h 18mAir Canada
Deal found 10/29$203

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 October 30, 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

Fri 12/5

4:15 pm-6:57 pm

Nonstop1h 42m

Toronto Island

Sun 12/7

9:15 am-10:05 am

Nonstop1h 50m

$190

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Fri 11/14

4:15 pm-6:57 pm

Nonstop1h 42m

Toronto Island

Sun 11/16

9:15 am-10:05 am

Nonstop1h 50m

$194

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Thu 1/15

11:00 am-1:42 pm

Nonstop1h 42m

Toronto Island

Tue 1/20

9:15 am-10:05 am

Nonstop1h 50m

$199

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Thu 1/15

11:00 am-1:42 pm

Nonstop1h 42m

Toronto Island

Fri 1/16

9:15 am-10:05 am

Nonstop1h 50m

$199

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Sat 1/17

12:45 pm-3:27 pm

Nonstop1h 42m

Toronto Island

Sun 1/18

9:15 am-10:05 am

Nonstop1h 50m

$202

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Fri 1/9

11:00 am-1:42 pm

Nonstop1h 42m

Toronto Island

Sun 1/11

9:15 am-10:05 am

Nonstop1h 50m

$206

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Mon 12/15

7:10 am-9:58 am

Nonstop1h 48m

Toronto Pearson Intl

Sat 1/17

8:55 am-10:01 am

Nonstop2h 06m

$210

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Wed 12/17

4:50 pm-7:45 pm

Nonstop1h 55m

Toronto Pearson Intl

Sat 1/17

3:30 pm-4:40 pm

Nonstop2h 10m

$210

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Mon 12/15

9:10 pm-11:59 pm

Nonstop1h 49m

Toronto Pearson Intl

Fri 1/16

9:00 pm-10:05 pm

Nonstop2h 05m

$210

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Wed 11/12

11:00 am-1:42 pm

Nonstop1h 42m

Toronto Island

Sat 11/22

11:00 am-11:50 am

Nonstop1h 50m

$215

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

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, March is the cheapest month in which you can book a flight from Illinois to Region of Ontario (average of $106). Flying from Illinois to Region of Ontario in July is currently the most expensive (average of $173). 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 October 30, 2025.

It’s optimal to fly from Illinois to Region of Ontario in the evening. By choosing this option you can save up to 29% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from Illinois to Region of Ontario?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Illinois to Region of Ontario flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 30, 2025.
Read through reviews of airlines operating flights from Illinois to Ontario, such as Porter Airlines, Air Transat, and United Airlines. 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.
Porter Airlines
8.0
Very good
384 reviews

Comfort

8.0

Entertainment

7.0

Food

7.6

Overall

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
8.0
Very good
384 reviews
Porter Airlines
8.0
Very good
384 reviews

Comfort

8.0

Entertainment

7.0

Food

7.6

Overall

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Transat
7.8
Good
469 reviews
Porter Airlines
8.0
Very good
384 reviews

Comfort

8.0

Entertainment

7.0

Food

7.6

Overall

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,998 reviews
Porter Airlines
8.0
Very good
384 reviews

Comfort

8.0

Entertainment

7.0

Food

7.6

Overall

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
American Airlines
7.2
Good
11,030 reviews
Porter Airlines
8.0
Very good
384 reviews

Comfort

8.0

Entertainment

7.0

Food

7.6

Overall

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,377 reviews
Porter Airlines
8.0
Very good
384 reviews

Comfort

8.0

Entertainment

7.0

Food

7.6

Overall

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

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.

  • How long is the flight from Illinois to Region of Ontario?

    There are many flights that can get you from Illinois to Region of Ontario in 1h 42m. Fly via Porter Airlines, United Airlines, or Delta to get the fastest option. Airlines will cover a distance of 442 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    $83 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 American Airlines and Delta, with prices starting from $86 and $89, 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, March is the cheapest month in which you can book a flight from Illinois to Region of Ontario (average of $106). Flying from Illinois to Region of Ontario in July is currently the most expensive (average of $173). 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.
LaGuardia to Pearson Intl flights
John F Kennedy Intl to Pearson Intl flights
Newark to Pearson Intl flights
Newark to Toronto Island flights
San Francisco to Vancouver Intl flights
Los Angeles to Vancouver Intl flights
Los Angeles to Pearson Intl flights
John F Kennedy Intl to Pierre Elliott Trudeau Intl flights
Newark to Pierre Elliott Trudeau Intl flights
LaGuardia to Pierre Elliott Trudeau Intl flights
John F Kennedy Intl to Vancouver Intl flights
Boston to Pearson Intl flights
Newark to Vancouver Intl flights
San Francisco to Pearson Intl flights
O'Hare Intl to Vancouver Intl flights
Reagan-National to Pearson Intl flights
O'Hare Intl to Pearson Intl flights
John F Kennedy Intl to Calgary flights
Dallas/Fort Worth to Pearson Intl flights
Boston to Toronto Island flights
Hobby to Vancouver Intl flights
Reagan-National to Pierre Elliott Trudeau Intl flights
Dulles Intl to Pearson Intl flights
Seattle to Vancouver Intl flights
Dulles Intl to Pierre Elliott Trudeau Intl flights
Ontario to Vancouver Intl flights
San Francisco to Abbotsford flights
Atlanta to Pearson Intl flights
Boston to Pierre Elliott Trudeau Intl flights
Newark to Calgary flights
George Bush Intcntl to Vancouver Intl flights
Los Angeles to Pierre Elliott Trudeau Intl flights
Los Angeles to Calgary flights
Los Angeles to Abbotsford flights
Santa Ana to Vancouver Intl flights
Newark to Québec City flights
Seattle to Pearson Intl flights
Fort Lauderdale to Pierre Elliott Trudeau Intl flights
San Diego to Vancouver Intl flights
LaGuardia to Vancouver Intl flights
Dulles Intl to Vancouver Intl flights
Minneapolis to Pearson Intl flights
O'Hare Intl to Calgary flights
O'Hare Intl to Pierre Elliott Trudeau Intl flights
Dulles Intl to Toronto Island flights
San Francisco to Calgary flights
Minneapolis to Saskatoon flights
John F Kennedy Intl to Toronto Island flights
Sky Harbor Intl to Pearson Intl flights
Los Angeles to Toronto Island 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapest$109Average$298FlexibilityNo cancel feeOn-time52%
Air CanadaCheapest$118Average$310FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$146Average$428FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$223Average$388FlexibilityNo 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.