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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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — YYZ
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
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 July 30, 2025.

Round-trip from

$172
(Trip.com)

One-way from

$70
(Cheapflightsfares)

Popular in

November

Cheapest in

August

Average price

$270

Good round-trip deal

$168 or less

Good one-way deal

$69 or less
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. 7% potential increase in price ($23 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 July 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 July 30, 2025.

This Trip.com deal was found by Cheapflights users on 7/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/79:35 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Fri 9/127:50 amYTZ - MDW
Nonstop1h 49mPorter Airlines
Deal found 7/29$172
This United Airlines deal was found by Cheapflights users on 7/30. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/138:50 amORD - YYZ
1 stop4h 29mUnited Airlines
Sat 9/135:15 pmYYZ - ORD
Nonstop1h 57mUnited Airlines
Deal found 7/30$173
This Gotogate deal was found by Cheapflights users on 7/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/128:25 pmORD - YYZ
Nonstop1h 43mAir Canada
Mon 9/152:10 pmYYZ - ORD
Nonstop1h 54mAir Canada
Deal found 7/30$177
This Cheapflightsfares deal was found by Cheapflights users on 7/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/105:20 pmMDW - YTZ
Nonstop1h 42mAir Transat
Sat 9/137:50 amYTZ - MDW
Nonstop1h 49mAir Transat
Deal found 7/29$184
This Mytrip deal was found by Cheapflights users on 7/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/209:40 amMDW - YTZ
Nonstop1h 40mMultiple Airlines
Sat 8/309:00 amYTZ - MDW
Nonstop1h 50mMultiple Airlines
Deal found 7/27$189
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 9/245:20 pmMDW - YUL
1 stop3h 55mPorter Airlines
Fri 9/261:10 pmYUL - MDW
1 stop4h 14mPorter Airlines
Deal found 7/28$196
This flygcity.se deal was found by Cheapflights users on 7/30. 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 flygcity.se is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2012:33 pmORD - YUL
1 stop8h 59mMultiple Airlines
Mon 9/228:20 amYUL - ORD
Nonstop2h 31mMultiple Airlines
Deal found 7/30$199
This Mytrip deal was found by Cheapflights users on 7/30. 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.
Sat 9/136:44 pmORD - YYZ
1 stop18h 21mMultiple Airlines
Sat 9/202:10 pmYYZ - ORD
Nonstop1h 54mMultiple Airlines
Deal found 7/30$202
This Air Canada deal was found by Cheapflights users on 7/30. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/228:40 amORD - YUL
Nonstop2h 17mAir Canada
Fri 9/268:20 amYUL - ORD
Nonstop2h 31mAir Canada
Deal found 7/30$203
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/299:12 pmORD - YUL
1 stop14h 12mAmerican Airlines
Sun 11/23:52 pmYUL - ORD
Nonstop3h 00mAmerican Airlines
Deal found 7/29$205
This Mytrip deal was found by Cheapflights users on 7/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/98:40 amORD - YTZ
1 stop7h 05mAir Canada
Sat 9/133:25 pmYTZ - ORD
1 stop5h 46mAir Canada
Deal found 7/29$206
This Mytrip deal was found by Cheapflights users on 7/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/189:15 amMDW - YUL
1 stop7h 05mMultiple Airlines
Sun 9/2110:45 amYUL - MDW
1 stop6h 39mMultiple Airlines
Deal found 7/27$219

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 July 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

Sun 9/7

9:35 am-12:17 pm

Nonstop1h 42m

Toronto Island

Fri 9/12

7:50 am-8:39 am

Nonstop1h 49m

$172

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Sat 9/13

8:50 am-2:19 pm

1 stop4h 29m

Toronto Pearson Intl

Sat 9/13

5:15 pm-6:12 pm

Nonstop1h 57m

$173

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Fri 9/12

8:25 pm-11:08 pm

Nonstop1h 43m

Toronto Pearson Intl

Mon 9/15

2:10 pm-3:04 pm

Nonstop1h 54m

$177

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Wed 9/10

5:20 pm-8:02 pm

Nonstop1h 42m

Toronto Island

Fri 9/12

3:35 pm-4:24 pm

Nonstop1h 49m

$184

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Wed 8/20

9:40 am-12:20 pm

Nonstop1h 40m

Toronto Island

Sat 8/30

9:00 am-9:50 am

Nonstop1h 50m

$189

ChicagoMontreal

MDW - YUL

MDWYUL

Chicago Midway

Wed 9/24

5:20 pm-10:15 pm

1 stop3h 55m

Montreal Pierre Elliott Trudeau Intl

Fri 9/26

1:10 pm-4:24 pm

1 stop4h 14m

$196

ChicagoMontreal

ORD - YUL

ORDYUL

Chicago O'Hare Intl

Sat 9/20

12:33 pm-10:32 pm

1 stop8h 59m

Montreal Pierre Elliott Trudeau Intl

Mon 9/22

8:20 am-9:51 am

Nonstop2h 31m

$199

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Sat 9/13

6:44 pm-2:05 pm

1 stop18h 21m

Toronto Pearson Intl

Sat 9/20

2:10 pm-3:04 pm

Nonstop1h 54m

$202

ChicagoMontreal

ORD - YUL

ORDYUL

Chicago O'Hare Intl

Mon 9/22

8:40 am-11:57 am

Nonstop2h 17m

Montreal Pierre Elliott Trudeau Intl

Fri 9/26

8:20 am-9:51 am

Nonstop2h 31m

$203

ChicagoToronto

ORD - YTZ

ORDYTZ

Chicago O'Hare Intl

Tue 9/9

8:40 am-4:45 pm

1 stop7h 05m

Toronto Island

Sat 9/13

3:25 pm-8:11 pm

1 stop5h 46m

$206

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

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 August is currently the most expensive (average of $348). 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 July 30, 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 July 30, 2025.

The most flights from USIL to CAON are scheduled on a Monday (63 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (44 on average).

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 July 30, 2025.
Read through reviews of airlines operating flights from Illinois to Ontario, such as Alaska Airlines, Porter Airlines, and Delta. 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Porter Airlines
8.0
Very good
318 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Air Transat
7.7
Good
424 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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?

    $70 is the cheapest one-way deal found within the past few days, from Air Transat. You may also be able to find cheap deals on Air Canada and Porter Airlines, with prices starting from $71 and $77, 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 August is currently the most expensive (average of $348). 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.
Newark to Pearson Intl flights
Newark to Toronto Island flights
John F Kennedy Intl to Pearson Intl flights
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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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$120Average$378FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$145Average$469FlexibilityNo cancel feeOn-time69%
Porter AirlinesCheapest$187Average$338FlexibilityNo cancel feeOn-time52%
American AirlinesCheapest$200Average$378FlexibilityNo cancel feeOn-time71%

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