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Ontario

$97+ 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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — YYZ
May 5 — May 121
Mon 5/5
Mon 5/12
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 April 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$170
(Air Canada)

One-way from

$97
(Trip.com)

Popular in

November

Cheapest in

July

Average price

$335

Good round-trip deal

$218 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. 4% potential increase in price ($14 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 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 April 30, 2025.

This Air Canada deal was found by Cheapflights users on 4/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/18:50 amORD - YYZ
Nonstop1h 59mAir Canada
Tue 7/12:00 pmYYZ - ORD
1 stop5h 53mAir Canada
Deal found 4/27$170
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Fri 6/209:40 amMDW - YTZ
Nonstop1h 40mPorter Airlines
Tue 6/243:35 pmYTZ - MDW
Nonstop1h 49mPorter Airlines
Deal found 4/29$178
This Trip.com deal was found by Cheapflights users on 4/29. 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.
Thu 6/129:40 amMDW - YTZ
Nonstop1h 40mMultiple Airlines
Thu 6/197:55 amYTZ - MDW
Nonstop1h 50mMultiple Airlines
Deal found 4/29$191
This Booking.com deal was found by Cheapflights users on 4/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/410:40 amORD - YTZ
1 stop5h 05mAir Canada
Sun 9/73:25 pmYTZ - ORD
1 stop5h 46mAir Canada
Deal found 4/29$200
This Trip.com deal was found by Cheapflights users on 4/29. 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.
Fri 8/19:40 amMDW - YTZ
Nonstop1h 40mAir Transat
Tue 8/53:35 pmYTZ - MDW
Nonstop1h 49mAir Transat
Deal found 4/29$236
This United deal was found by Cheapflights users on 4/28. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/249:45 pmORD - YYZ
1 stop9h 31mMultiple Airlines
Wed 5/282:10 pmYYZ - ORD
Nonstop1h 55mMultiple Airlines
Deal found 4/28$246
This Kiwi.com deal was found by Cheapflights users on 4/28. 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 5/295:20 pmMDW - YUL
1 stop3h 55mPorter Airlines
Tue 6/31:10 pmYUL - MDW
1 stop4h 14mPorter Airlines
Deal found 4/28$248
This Atrapalo deal was found by Cheapflights users on 4/29. 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 Atrapalo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/139:40 amMDW - YTZ
Nonstop1h 40mAPG Airlines
Fri 6/207:55 amYTZ - MDW
Nonstop1h 50mAPG Airlines
Deal found 4/29$259
This American Airlines deal was found by Cheapflights users on 4/29. 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.
Sat 6/78:10 amORD - YUL
Nonstop2h 20mAmerican Airlines
Sat 6/72:35 pmYUL - ORD
1 stop10h 22mAmerican Airlines
Deal found 4/29$276
This Flightnetwork deal was found by Cheapflights users on 4/28. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/47:19 amORD - YUL
Nonstop2h 21mAir Canada
Tue 6/246:15 amYUL - ORD
Nonstop2h 44mAir Canada
Deal found 4/28$295
This United Airlines deal was found by Cheapflights users on 4/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/264:43 pmORD - YYZ
Nonstop1h 54mUnited Airlines
Mon 6/306:00 pmYYZ - ORD
1 stop6h 37mUnited Airlines
Deal found 4/27$299
This Delta deal was found by Cheapflights users on 4/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/291:08 pmMDW - YYZ
1 stop3h 07mDelta
Thu 6/56:30 amYYZ - MDW
1 stop3h 10mDelta
Deal found 4/29$302

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 April 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

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Tue 7/1

8:50 am-11:49 am

Nonstop1h 59m

Toronto Pearson Intl

Tue 7/1

2:00 pm-6:53 pm

1 stop5h 53m

$170

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Fri 6/20

9:40 am-12:20 pm

Nonstop1h 40m

Toronto Island

Tue 6/24

3:35 pm-4:24 pm

Nonstop1h 49m

$178

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Thu 6/12

9:40 am-12:20 pm

Nonstop1h 40m

Toronto Island

Thu 6/19

7:55 am-8:45 am

Nonstop1h 50m

$191

ChicagoToronto

ORD - YTZ

ORDYTZ

Chicago O'Hare Intl

Thu 9/4

10:40 am-4:45 pm

1 stop5h 05m

Toronto Island

Sun 9/7

3:25 pm-8:11 pm

1 stop5h 46m

$200

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Fri 8/1

9:40 am-12:20 pm

Nonstop1h 40m

Toronto Island

Tue 8/5

3:35 pm-4:24 pm

Nonstop1h 49m

$236

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

Sat 5/24

9:45 pm-8:16 am

1 stop9h 31m

Toronto Pearson Intl

Wed 5/28

2:10 pm-3:05 pm

Nonstop1h 55m

$246

ChicagoMontreal

MDW - YUL

MDWYUL

Chicago Midway

Thu 5/29

5:20 pm-10:15 pm

1 stop3h 55m

Montreal Pierre Elliott Trudeau Intl

Tue 6/3

1:10 pm-4:24 pm

1 stop4h 14m

$248

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

Fri 6/13

9:40 am-12:20 pm

Nonstop1h 40m

Toronto Island

Fri 6/20

7:55 am-8:45 am

Nonstop1h 50m

$259

ChicagoMontreal

ORD - YUL

ORDYUL

Chicago O'Hare Intl

Sat 6/7

8:10 am-11:30 am

Nonstop2h 20m

Montreal Pierre Elliott Trudeau Intl

Sat 6/7

2:35 pm-11:57 pm

1 stop10h 22m

$276

ChicagoMontreal

ORD - YUL

ORDYUL

Chicago O'Hare Intl

Wed 6/4

7:19 am-10:40 am

Nonstop2h 21m

Montreal Pierre Elliott Trudeau Intl

Tue 6/24

6:15 am-7:59 am

Nonstop2h 44m

$295

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

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 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 April 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 April 30, 2025.

The most flights from USIL to CAON are scheduled on a Tuesday (57 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (34 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 April 30, 2025.
Read through reviews of airlines operating flights from Illinois to Ontario, such as Alaska Airlines, Porter Airlines and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,968 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Porter Airlines
8.0
Very good
285 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,936 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
KLM
7.8
Good
1,333 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Air Transat
7.8
Good
385 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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?

    $97 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 $97 and $103, 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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$119Average$512FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$122Average$344FlexibilityNo cancel feeOn-time52%
American AirlinesCheapest$129Average$366FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$174Average$513FlexibilityNo cancel feeOn-time69%

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