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$103+ 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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — YYZ
abr 6 — abr 131
dom 4/6
dom 4/13
1 adult, Economy
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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 abril 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$190
(Trip.com)

One-way from

$103
(Mytrip)

Popular in

March

Cheapest in

April

Average price

$271

Good round-trip deal

$223 or less

Good one-way deal

$138 or less
Provider with most accurate pricing for Chicago (CHI)-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Toronto (YTO) flights.
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From Illinois to Ontario
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One-way flight from Illinois to Ontario
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Highest demand for flights based on searches. 6% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Illinois to Ontario.
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Price to beat on a one-way flight from Illinois to Ontario.
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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 abril 1, 2025.

This Trip.com deal was found by Cheapflights users on 3/31. 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.
qui 4/245:35 pmMDW - YTZ
Nonstop1h 42mPorter Airlines
sáb 4/2611:10 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 3/31$190
This Trip.com deal was found by Cheapflights users on 4/1. 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.
sex 5/239:40 amMDW - YTZ
Nonstop1h 42mMultiple Airlines
dom 5/254:05 pmYTZ - MDW
Nonstop1h 49mMultiple Airlines
Deal found 4/1$215
This Mytrip deal was found by Cheapflights users on 3/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 5/1510:40 amORD - YTZ
1 stop6h 10mAir Canada
qui 5/228:25 amYTZ - ORD
1 stop7h 22mAir Canada
Deal found 3/30$217
This Trip.com deal was found by Cheapflights users on 4/1. 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.
sex 5/29:40 amMDW - YUL
1 stop5h 20mPorter Airlines
dom 5/410:45 amYUL - MDW
1 stop7h 09mPorter Airlines
Deal found 4/1$220
This Mytrip deal was found by Cheapflights users on 3/31. 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.
sex 5/99:08 pmORD - YYZ
1 stop14h 22mMultiple Airlines
dom 5/114:00 pmYYZ - ORD
1 stop25h 25mMultiple Airlines
Deal found 3/31$220
This Mytrip deal was found by Cheapflights users on 3/31. 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.
seg 5/129:35 amORD - YYZ
Nonstop1h 40mAir Canada
seg 5/196:15 amYYZ - ORD
1 stop4h 37mAir Canada
Deal found 3/31$224
This Flightnetwork deal was found by Cheapflights users on 3/31. 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.
qui 5/1510:40 amORD - YUL
Nonstop2h 16mAir Canada
qui 5/226:40 pmYUL - ORD
Nonstop2h 32mAir Canada
Deal found 3/31$247
This Kissandfly.com deal was found by Cheapflights users on 3/31. 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.
qui 4/246:01 pmORD - YYZ
Nonstop1h 43mLufthansa
dom 4/277:00 amYYZ - ORD
Nonstop2h 03mLufthansa
Deal found 3/31$268
This United Airlines deal was found by Cheapflights users on 3/31. 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.
sáb 8/99:31 pmORD - YYZ
1 stop13h 30mUnited Airlines
dom 8/102:20 pmYYZ - ORD
Nonstop1h 54mUnited Airlines
Deal found 3/31$269
This American Airlines deal was found by Cheapflights users on 3/31. 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.
ter 4/228:30 pmORD - YUL
1 stop12h 20mAmerican Airlines
qua 4/2312:30 pmYUL - ORD
Nonstop2h 35mAmerican Airlines
Deal found 3/31$270
This Mytrip deal was found by Cheapflights users on 3/31. 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.
seg 5/125:20 pmORD - YTZ
2 stops20h 30mMultiple Airlines
seg 5/193:25 pmYTZ - ORD
1 stop5h 47mMultiple Airlines
Deal found 3/31$270
This United deal was found by Cheapflights users on 3/30. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 4/248:45 amORD - YUL
1 stop6h 05mMultiple Airlines
qui 4/246:20 pmYUL - ORD
Nonstop2h 40mMultiple Airlines
Deal found 3/30$282

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 abril 1, 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

qui 4/24

5:35 pm-8:17 pm

Nonstop1h 42m

Toronto Island

sáb 4/26

11:10 am-12:00 pm

Nonstop1h 50m

$190

ChicagoToronto

ORD - YTZ

ORDYTZ

Chicago O'Hare Intl

qui 5/15

10:40 am-5:50 pm

1 stop6h 10m

Toronto Island

qui 5/22

8:25 am-2:47 pm

1 stop7h 22m

$217

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

sex 5/9

9:08 pm-12:30 pm

1 stop14h 22m

Toronto Pearson Intl

dom 5/11

4:00 pm-4:25 pm

1 stop25h 25m

$220

ChicagoMontreal

MDW - YUL

MDWYUL

Chicago Midway

sex 5/2

9:40 am-4:00 pm

1 stop5h 20m

Montreal Pierre Elliott Trudeau Intl

dom 5/4

10:45 am-4:54 pm

1 stop7h 09m

$220

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

seg 5/12

9:35 am-12:15 pm

Nonstop1h 40m

Toronto Pearson Intl

seg 5/19

6:15 am-9:52 am

1 stop4h 37m

$224

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

qui 5/15

9:40 am-12:22 pm

Nonstop1h 42m

Toronto Island

qui 5/22

3:35 pm-4:24 pm

Nonstop1h 49m

$242

ChicagoMontreal

ORD - YUL

ORDYUL

Chicago O'Hare Intl

qui 5/15

10:40 am-1:56 pm

Nonstop2h 16m

Montreal Pierre Elliott Trudeau Intl

qui 5/22

6:40 pm-8:12 pm

Nonstop2h 32m

$247

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

qui 4/24

6:01 pm-8:44 pm

Nonstop1h 43m

Toronto Pearson Intl

dom 4/27

7:00 am-8:03 am

Nonstop2h 03m

$268

ChicagoMontreal

ORD - YUL

ORDYUL

Chicago O'Hare Intl

ter 4/22

8:30 pm-9:50 am

1 stop12h 20m

Montreal Pierre Elliott Trudeau Intl

qua 4/23

12:30 pm-2:05 pm

Nonstop2h 35m

$270

ChicagoToronto

ORD - YTZ

ORDYTZ

Chicago O'Hare Intl

seg 5/12

5:20 pm-2:50 pm

2 stops20h 30m

Toronto Island

seg 5/19

3:25 pm-8:12 pm

1 stop5h 47m

$270

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/30

Showing 1-10 of 60 results
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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 $359). 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 abril 1, 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 abril 1, 2025.

The most flights from USIL to CAON are scheduled on a Sunday (56 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (28 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 abril 1, 2025.
Read through reviews of airlines operating flights from Illinois to Ontario, such as Alaska Airlines, Delta and Porter Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,818 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,899 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Porter Airlines
7.9
Good
277 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
KLM
7.8
Good
1,321 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Air Transat
7.8
Good
381 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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?

    $104 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 $104 and $117, 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 $359). 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

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Alternative routes for Illinois to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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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 abril 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapest$122Average$340FlexibilityNo cancel feeOn-time52%
Air CanadaCheapest$122Average$538FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$122Average$356FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$156Average$531FlexibilityNo cancel feeOn-time69%
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