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$70+ 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 3/27. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — YYZ
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$130
(123 Milhas)

One-way from

$70
(Mytrip)

Popular in

March

Cheapest in

April

Average price

$323

Good round-trip deal

$231 or less

Good one-way deal

$116 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. 3% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 20, 2025.

This 123 Milhas deal was found by Cheapflights users on 2/20. 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 123 Milhas is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/258:25 pmORD - YOW
1 stop4h 09mAir Canada
Thu 5/19:20 amYOW - ORD
1 stop4h 35mAir Canada
Deal found 2/20$130
This 123 Milhas deal was found by Cheapflights users on 2/20. 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 123 Milhas is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/48:25 pmORD - YYZ
Nonstop1h 41mAir Canada
Wed 4/96:25 amYYZ - ORD
1 stop5h 22mAir Canada
Deal found 2/20$178
This 123 Milhas deal was found by Cheapflights users on 2/20. 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 123 Milhas is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/177:20 amORD - YTZ
1 stop6h 30mAir Canada
Mon 4/217:25 amYTZ - ORD
1 stop5h 07mAir Canada
Deal found 2/20$207
This Mytrip deal was found by Cheapflights users on 2/20. 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.
Tue 4/112:14 pmORD - YYZ
1 stop22h 31mMultiple Airlines
Tue 4/88:00 pmYYZ - ORD
1 stop19h 03mMultiple Airlines
Deal found 2/20$210
This CheapTickets deal was found by Cheapflights users on 2/19. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/512:55 pmMDW - YTZ
Nonstop1h 42mPorter Airlines
Sat 4/1211:10 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 2/19$211
This Mytrip deal was found by Cheapflights users on 2/19. 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.
Tue 4/16:47 pmSTL - YYZ
1 stop28h 08mMultiple Airlines
Thu 4/37:05 amYYZ - STL
1 stop11h 47mMultiple Airlines
Deal found 2/19$215
This Agoda.com deal was found by Cheapflights users on 2/19. 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 Agoda.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1611:15 amMDW - YTZ
Nonstop1h 42mMultiple Airlines
Wed 4/239:30 amYTZ - MDW
Nonstop1h 50mMultiple Airlines
Deal found 2/19$222
This Mytrip deal was found by Cheapflights users on 2/20. 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.
Thu 4/107:49 pmORD - YUL
1 stop18h 06mMultiple Airlines
Mon 4/143:55 pmYUL - ORD
1 stop26h 46mMultiple Airlines
Deal found 2/20$227
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
Sun 4/65:15 amMDW - YYZ
1 stop17h 15mMultiple Airlines
Sun 4/137:25 pmYYZ - MDW
1 stop10h 55mMultiple Airlines
Deal found 2/20$246
This Trip.com deal was found by Cheapflights users on 2/19. 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.
Fri 5/309:15 amMDW - YTZ
Nonstop1h 42mAir Transat
Mon 6/23:35 pmYTZ - MDW
Nonstop1h 49mAir Transat
Deal found 2/19$250
This Trip.com deal was found by Cheapflights users on 2/20. 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.
Fri 4/1111:15 amMDW - YUL
1 stop4h 32mPorter Airlines
Sun 4/136:50 amYUL - MDW
1 stop4h 30mPorter Airlines
Deal found 2/20$253
This United Airlines deal was found by Cheapflights users on 2/19. 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.
Fri 3/219:12 pmORD - YYZ
Nonstop1h 47mUnited Airlines
Mon 3/312:45 pmYYZ - ORD
Nonstop2h 06mUnited Airlines
Deal found 2/19$272

Find flights from Illinois to Ontario within your budget

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 February 20, 2025.

Fly from

Illinois

Fly to

Ontario

Route

Depart

Return

Price

ChicagoOttawa

ORD - YOW

ORDYOW

Chicago O'Hare Intl

Fri 4/25

8:25 pm-1:34 am

1 stop4h 09m

Ottawa

Thu 5/1

9:20 am-12:55 pm

1 stop4h 35m

$130

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Fri 4/4

8:25 pm-11:06 pm

Nonstop1h 41m

Toronto Pearson Intl

Wed 4/9

6:25 am-10:47 am

1 stop5h 22m

$178

ChicagoToronto

ORD - YTZ

ORDYTZ

Chicago O'Hare Intl

Thu 4/17

7:20 am-2:50 pm

1 stop6h 30m

Toronto Island

Mon 4/21

7:25 am-11:32 am

1 stop5h 07m

$207

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Tue 4/1

6:25 pm-11:55 pm

2 stops28h 30m

Toronto Pearson Intl

Tue 4/8

8:00 pm-2:03 pm

1 stop19h 03m

$210

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Sat 4/5

12:55 pm-3:37 pm

Nonstop1h 42m

Toronto Island

Sat 4/12

11:10 am-12:00 pm

Nonstop1h 50m

$211

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 4/1

6:47 pm-11:55 pm

1 stop28h 08m

Toronto Pearson Intl

Thu 4/3

7:05 am-5:52 pm

1 stop11h 47m

$215

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Wed 4/16

11:15 am-1:57 pm

Nonstop1h 42m

Toronto Island

Wed 4/23

9:30 am-10:20 am

Nonstop1h 50m

$222

ChicagoMontreal

ORD - YUL

ORDYUL

Chicago O'Hare Intl

Thu 4/10

7:49 pm-2:55 pm

1 stop18h 06m

Montreal Pierre Elliott Trudeau Intl

Mon 4/14

3:55 pm-5:41 pm

1 stop26h 46m

$227

ChicagoToronto

MDW - YYZ

MDWYYZ

Chicago Midway

Sun 4/6

5:15 am-11:30 pm

1 stop17h 15m

Toronto Pearson Intl

Sun 4/13

7:25 pm-5:20 am

1 stop10h 55m

$246

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Fri 5/30

9:15 am-11:57 am

Nonstop1h 42m

Toronto Island

Mon 6/2

3:35 pm-4:24 pm

Nonstop1h 49m

$250

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

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.

Travel insights for flights from Illinois to Ontario

Get recent, data-driven insights about flights from Illinois to Ontario including ideal travel times, pricing trends, and more.

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 February 20, 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 February 20, 2025.

The most flights from USIL to CAON are scheduled on a Thursday (54 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (31 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 February 20, 2025.
Read through reviews of airlines operating flights from Illinois to Ontario, such as Japan Airlines, Alaska 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
1,440 reviews

Entertainment

7.8

Overall

8.3

Food

7.7

Crew

8.7

Boarding

8.4

Comfort

8.2

Reviews

1 / 20

8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!

Japan Airlines
8.3
Very good
1,440 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Food

7.7

Crew

8.7

Boarding

8.4

Comfort

8.2

Reviews

1 / 20

8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!

Alaska Airlines
8.0
Very good
9,692 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Food

7.7

Crew

8.7

Boarding

8.4

Comfort

8.2

Reviews

1 / 20

8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!

Delta
8.0
Very good
8,220 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Food

7.7

Crew

8.7

Boarding

8.4

Comfort

8.2

Reviews

1 / 20

8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!

Porter Airlines
7.9
Good
276 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Food

7.7

Crew

8.7

Boarding

8.4

Comfort

8.2

Reviews

1 / 20

8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!

Air Transat
7.8
Good
380 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Food

7.7

Crew

8.7

Boarding

8.4

Comfort

8.2

Reviews

1 / 20

8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!

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 $105 and $111, 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

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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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapest$122Average$344FlexibilityNo cancel feeOn-time52%
American AirlinesCheapest$122Average$343FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$122Average$550FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$145Average$539FlexibilityNo cancel feeOn-time69%
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