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Illinois

$124+ 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 4/21. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
Apr 5 — Apr 121
Sa 4/5
Sa 4/12
1 adult, Economy
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Cheap flight deals from Ontario to Illinois

Keep the following information in mind while searching for Ontario to Illinois flight deals. Data was last updated März 31, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$199
(Trip.com)

One-way from

$124
(Cheapflightsfares)

Popular in

December

Cheapest in

April

Average price

$279

Good round-trip deal

$180 or less

Good one-way deal

$119 or less
Provider with most accurate pricing for Toronto (YTO)-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Toronto (YTO)-Chicago (CHI) flights.
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From Ontario to Illinois
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One-way flight from Ontario to Illinois
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Highest demand for flights based on searches. 4% potential increase in price ($13 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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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 März 31, 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.
Mi 4/239:30 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Mi 4/3011:15 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 3/31$199
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 5/1410:00 amYYZ - ORD
Nonstop1h 54mAir Canada
Mi 5/218:25 pmORD - YYZ
Nonstop1h 42mAir Canada
Deal found 3/30$213
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.
Do 5/158:25 amYTZ - ORD
1 stop7h 22mAir Canada
Do 5/222:07 pmORD - YTZ
1 stop6h 28mAir Canada
Deal found 3/30$219
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.
Do 4/247:00 amYYZ - ORD
Nonstop2h 03mMultiple Airlines
So 4/277:20 amORD - YYZ
1 stop5h 19mMultiple Airlines
Deal found 3/30$234
This Air Canada deal was found by Cheapflights users on 3/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 4/196:20 pmYUL - ORD
Nonstop2h 40mAir Canada
So 4/201:56 pmORD - YUL
1 stop6h 45mAir Canada
Deal found 3/29$237
This FlightHub deal was found by Cheapflights users on 3/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 4/2110:45 amYUL - MDW
1 stop6h 55mPorter Airlines
Di 4/295:35 pmMDW - YUL
1 stop4h 12mPorter Airlines
Deal found 3/29$240
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 5/144:05 pmYTZ - MDW
Nonstop1h 49mAir Transat
Mi 5/219:40 amMDW - YTZ
Nonstop1h 42mAir Transat
Deal found 3/30$243
This Kissandfly.com 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 4/247:00 amYYZ - ORD
Nonstop2h 03mLufthansa
So 4/279:02 amORD - YYZ
Nonstop1h 47mLufthansa
Deal found 3/30$245
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 5/13:35 pmYTZ - MDW
Nonstop1h 49mMultiple Airlines
So 5/49:40 amMDW - YTZ
Nonstop1h 42mMultiple Airlines
Deal found 3/30$248
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.
Di 4/229:15 amYUL - ORD
Nonstop2h 32mMultiple Airlines
Mi 4/231:56 pmORD - YUL
1 stop6h 45mMultiple Airlines
Deal found 3/30$250
This United Airlines 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 5/112:00 pmYYZ - ORD
Nonstop1h 55mUnited Airlines
So 5/48:50 amORD - YYZ
1 stop7h 19mUnited Airlines
Deal found 3/30$253
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 4/256:00 amYYZ - ORD
1 stop4h 21mDelta
So 4/276:45 amORD - YYZ
1 stop3h 40mDelta
Deal found 3/31$259

Cheapflights Fare Finder

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 März 31, 2025.
Use the filters below to find and compare flights from Ontario to Illinois that are best for you.

Fly from

Ontario

Fly to

Illinois

Route

Depart

Return

Price

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mi 4/23

9:30 am-10:20 am

Nonstop1h 50m

Chicago Midway

Mi 4/30

11:15 am-1:57 pm

Nonstop1h 42m

$199

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Mi 5/14

10:00 am-10:54 am

Nonstop1h 54m

Chicago O'Hare Intl

Mi 5/21

8:25 pm-11:07 pm

Nonstop1h 42m

$213

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

Do 5/15

8:25 am-2:47 pm

1 stop7h 22m

Chicago O'Hare Intl

Do 5/22

2:07 pm-9:35 pm

1 stop6h 28m

$219

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Do 4/24

7:00 am-8:03 am

Nonstop2h 03m

Chicago O'Hare Intl

So 4/27

7:20 am-1:39 pm

1 stop5h 19m

$234

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Sa 4/19

6:20 pm-8:00 pm

Nonstop2h 40m

Chicago O'Hare Intl

So 4/20

1:56 pm-9:41 pm

1 stop6h 45m

$237

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

Mo 4/21

10:45 am-4:40 pm

1 stop6h 55m

Chicago Midway

Di 4/29

5:35 pm-10:47 pm

1 stop4h 12m

$240

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mi 5/14

4:05 pm-4:54 pm

Nonstop1h 49m

Chicago Midway

Mi 5/21

9:40 am-12:22 pm

Nonstop1h 42m

$243

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Do 4/24

7:00 am-8:03 am

Nonstop2h 03m

Chicago O'Hare Intl

So 4/27

9:02 am-11:49 am

Nonstop1h 47m

$245

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Do 5/1

3:35 pm-4:24 pm

Nonstop1h 49m

Chicago Midway

So 5/4

9:40 am-12:22 pm

Nonstop1h 42m

$248

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Di 4/22

9:15 am-10:47 am

Nonstop2h 32m

Chicago O'Hare Intl

Mi 4/23

1:56 pm-9:41 pm

1 stop6h 45m

$250

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 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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Illinois

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 $323). 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 März 31, 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 März 31, 2025.

The most flights from CAON to USIL are scheduled on a Sunday (57 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (29 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 März 31, 2025.
See what other customers who have flown with Japan Airlines, Alaska Airlines and Delta 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.
Japan Airlines
8.3
Very good
1,440 reviews

Boarding

8.4

Food

7.7

Crew

8.7

Entertainment

7.8

Comfort

8.2

Overall

8.3

Reviews

1 / 20
10.0
Excellent

mark,Nov 2024

YVR - NRT

I like that flight because super nice and friendly. I’m a senior and quick not comfortable to ask what I need help. But would be nicer if they check us if we need any more help because we are not able to leave our seat. However Japan Aniline is my on top priority
Japan Airlines
8.3
Very good
1,440 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Boarding

8.4

Food

7.7

Crew

8.7

Entertainment

7.8

Comfort

8.2

Overall

8.3

Reviews

1 / 20
10.0
Excellent

mark,Nov 2024

YVR - NRT

I like that flight because super nice and friendly. I’m a senior and quick not comfortable to ask what I need help. But would be nicer if they check us if we need any more help because we are not able to leave our seat. However Japan Aniline is my on top priority
Alaska Airlines
8.0
Very good
9,818 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Boarding

8.4

Food

7.7

Crew

8.7

Entertainment

7.8

Comfort

8.2

Overall

8.3

Reviews

1 / 20
10.0
Excellent

mark,Nov 2024

YVR - NRT

I like that flight because super nice and friendly. I’m a senior and quick not comfortable to ask what I need help. But would be nicer if they check us if we need any more help because we are not able to leave our seat. However Japan Aniline is my on top priority
Delta
8.0
Very good
7,899 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Boarding

8.4

Food

7.7

Crew

8.7

Entertainment

7.8

Comfort

8.2

Overall

8.3

Reviews

1 / 20
10.0
Excellent

mark,Nov 2024

YVR - NRT

I like that flight because super nice and friendly. I’m a senior and quick not comfortable to ask what I need help. But would be nicer if they check us if we need any more help because we are not able to leave our seat. However Japan Aniline is my on top priority
Porter Airlines
7.9
Good
277 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Boarding

8.4

Food

7.7

Crew

8.7

Entertainment

7.8

Comfort

8.2

Overall

8.3

Reviews

1 / 20
10.0
Excellent

mark,Nov 2024

YVR - NRT

I like that flight because super nice and friendly. I’m a senior and quick not comfortable to ask what I need help. But would be nicer if they check us if we need any more help because we are not able to leave our seat. However Japan Aniline is my on top priority
KLM
7.8
Good
1,321 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Boarding

8.4

Food

7.7

Crew

8.7

Entertainment

7.8

Comfort

8.2

Overall

8.3

Reviews

1 / 20
10.0
Excellent

mark,Nov 2024

YVR - NRT

I like that flight because super nice and friendly. I’m a senior and quick not comfortable to ask what I need help. But would be nicer if they check us if we need any more help because we are not able to leave our seat. However Japan Aniline is my on top priority

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?

    $124 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 $135 and $139, 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 $323). 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 März 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$157Average$378FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$170Average$307FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$233Average$498FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$236Average$403FlexibilityNo cancel feeOn-time71%
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