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$134+ Cheap flights from Ontario to Illinois

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 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
ene. 26 — feb. 21
dom. 1/26
dom. 2/2
1 adult, Economy
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Cheap flight deals from Ontario to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (CAON) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated enero 21, 2025.

Round-trip from

$236
(Cheapflightsfares)

One-way from

$134
(iWofly)

Good round-trip deal

$237 or less

Good one-way deal

$155 or less
From Ontario to Illinois
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One-way flight from Ontario to Illinois
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Price to beat on a round-trip flight from Ontario to Illinois.
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Price to beat on a one-way flight from Ontario to Illinois.
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Find flight deals from Ontario to Illinois

Cheapest flights from Ontario to Illinois
Explore the most affordable flight options available from Ontario to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 21, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 1/21. 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.
jue. 2/1311:20 amYTZ - MDW
Nonstop1h 50mPorter Airlines
lun. 2/171:05 pmMDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 1/21$236
This American Airlines deal was found by Cheapflights users on 1/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 3/16:20 pmYYZ - ORD
Nonstop2h 00mAmerican Airlines
mié. 3/58:11 amORD - YYZ
Nonstop1h 40mAmerican Airlines
Deal found 1/20$238
This Cheapflightsfares deal was found by Cheapflights users on 1/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 3/149:30 amYTZ - MDW
Nonstop1h 50mAir Transat
dom. 3/1611:15 amMDW - YTZ
Nonstop1h 42mAir Transat
Deal found 1/20$243
This Air Canada deal was found by Cheapflights users on 1/21. 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.
vie. 2/216:40 pmYYZ - ORD
Nonstop1h 57mAir Canada
lun. 2/247:12 amORD - YYZ
Nonstop1h 46mAir Canada
Deal found 1/21$244
This Trip.com deal was found by Cheapflights users on 1/19. 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.
dom. 2/98:35 amYOW - MDW
1 stop4h 35mPorter Airlines
jue. 2/131:05 pmMDW - YOW
1 stop6h 29mPorter Airlines
Deal found 1/19$244
This United deal was found by Cheapflights users on 1/20. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/126:40 pmYYZ - ORD
Nonstop1h 57mMultiple Airlines
sáb. 2/229:50 amORD - YYZ
Nonstop1h 35mMultiple Airlines
Deal found 1/20$247
This Air Canada deal was found by Cheapflights users on 1/21. 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.
vie. 2/148:50 amYTZ - ORD
1 stop5h 09mAir Canada
lun. 2/171:58 pmORD - YTZ
1 stop5h 45mAir Canada
Deal found 1/21$248
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/1211:20 amYTZ - MDW
1 stop8h 03mMultiple Airlines
dom. 2/161:05 pmMDW - YTZ
Nonstop1h 42mMultiple Airlines
Deal found 1/19$253
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/126:45 amYTZ - ORD
1 stop5h 20mMultiple Airlines
jue. 2/135:15 amORD - YTZ
1 stop5h 25mMultiple Airlines
Deal found 1/19$257
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/136:00 amYYZ - ORD
1 stop4h 16mDelta
sáb. 2/154:58 pmORD - YYZ
1 stop4h 51mDelta
Deal found 1/20$266
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/131:20 pmYYZ - MDW
1 stop5h 51mDelta
sáb. 2/155:05 pmMDW - YYZ
1 stop4h 44mDelta
Deal found 1/20$266
This Kiwi.com deal was found by Cheapflights users on 1/20. 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.
mar. 3/116:30 amYUL - STL
1 stop11h 12mMultiple Airlines
mar. 3/185:38 pmSTL - YUL
1 stop22h 57mMultiple Airlines
Deal found 1/20$267

Find flights from Ontario to Illinois within your budget

Customize your flight search to find flights from Ontario to Illinois 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 enero 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

jue. 2/13

11:20 am-12:10 pm

Nonstop1h 50m

Chicago Midway

lun. 2/17

1:05 pm-3:47 pm

Nonstop1h 42m

$236

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

sáb. 3/1

11:31 am-12:31 pm

Nonstop2h 00m

Chicago O'Hare Intl

mié. 3/5

8:11 am-10:51 am

Nonstop1h 40m

$238

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

vie. 3/14

9:30 am-10:20 am

Nonstop1h 50m

Chicago Midway

dom. 3/16

11:15 am-1:57 pm

Nonstop1h 42m

$243

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

dom. 2/16

12:20 pm-1:11 pm

Nonstop1h 51m

Chicago O'Hare Intl

dom. 2/23

8:30 pm-11:11 pm

Nonstop1h 41m

$244

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

dom. 2/9

8:35 am-12:10 pm

1 stop4h 35m

Chicago Midway

jue. 2/13

1:05 pm-8:34 pm

1 stop6h 29m

$244

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

mié. 2/12

6:40 pm-7:37 pm

Nonstop1h 57m

Chicago O'Hare Intl

sáb. 2/22

9:50 am-12:25 pm

Nonstop1h 35m

$247

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

vie. 2/14

8:50 am-12:59 pm

1 stop5h 09m

Chicago O'Hare Intl

lun. 2/17

1:58 pm-8:43 pm

1 stop5h 45m

$248

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

mié. 2/12

11:20 am-6:23 pm

1 stop8h 03m

Chicago Midway

dom. 2/16

1:05 pm-3:47 pm

Nonstop1h 42m

$253

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

mar. 2/18

2:00 pm-10:40 am

2 stops21h 40m

Chicago O'Hare Intl

mar. 2/25

7:10 am-10:23 pm

2 stops14h 13m

$256

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

jue. 2/13

6:00 am-9:16 am

1 stop4h 16m

Chicago O'Hare Intl

sáb. 2/15

4:58 pm-10:49 pm

1 stop4h 51m

$266

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ontario 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 Ontario to Illinois

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

What is the cheapest month to book a flight from Region of Ontario to Illinois?

Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of $245). Flying from Region of Ontario to Illinois in March is currently the most expensive (average of $320). 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 ON to IL?

Find hourly flight availability from Ontario to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated enero 21, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to Illinois as you normally would.

Weekly flight availability from Region of Ontario to Illinois

Explore weekly flight availability from Ontario to Illinois. 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 enero 21, 2025.

The most flights from CAON to USIL are scheduled on a Monday (52 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (33 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated enero 21, 2025.
See what other customers who have flown with KLM, Air Canada and United Airlines from Ontario to Illinois have to say. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
8,521 reviews

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.9

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very good
8,521 reviews
Delta
8.0
Very good
8,521 reviews

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.9

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Alaska Airlines
8.0
Very good
9,706 reviews
Delta
8.0
Very good
8,521 reviews

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.9

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Porter Airlines
7.9
Good
277 reviews
Delta
8.0
Very good
8,521 reviews

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.9

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM
7.8
Good
1,341 reviews
Delta
8.0
Very good
8,521 reviews

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.9

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Air Transat
7.8
Good
381 reviews
Delta
8.0
Very good
8,521 reviews

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.9

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Ontario to Illinois. 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 Region of Ontario to Illinois one-way?

    $134 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 American Airlines, with prices starting from $147 and $149, respectively.

  • Can I find deals for flights from Ontario to Illinois that include hotel bookings?

    Yes. In addition to deals on Ontario to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Illinois.

  • Can I find deals for business class flights from Ontario to Illinois?

    Yes. Cheapflights offers flight deals from Ontario to Illinois 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 Region of Ontario to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of $245). Flying from Region of Ontario to Illinois in March is currently the most expensive (average of $320). 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 Ontario to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Ontario to Illinois

Discover the top 4 airlines that operate flights from Ontario to Illinois. 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 enero 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$206Average$423FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$209Average$316FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$225Average$434FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$238Average$402FlexibilityNo cancel feeOn-time71%
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