HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$143+ 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 12/16. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
nov. 25 — dic. 21
lun. 11/25
lun. 12/2
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Illinois with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 noviembre 20, 2024.

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 noviembre 20, 2024.

This oojo deal was found by Cheapflights users on 11/19. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/123:50 pmYTZ - MDW
Nonstop1h 50mPorter Airlines
lun. 12/1612:05 pmMDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 11/19$228
This Air Canada deal was found by Cheapflights users on 11/18. 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.
mié. 12/1112:00 pmYYZ - ORD
1 stop7h 41mAir Canada
jue. 12/127:19 amORD - YYZ
Nonstop1h 39mAir Canada
Deal found 11/18$237
This Air Canada deal was found by Cheapflights users on 11/18. 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.
sáb. 12/148:25 amYTZ - ORD
1 stop7h 20mAir Canada
vie. 1/1011:35 amORD - YTZ
1 stop5h 15mAir Canada
Deal found 11/18$241
This United Airlines deal was found by Cheapflights users on 11/19. 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.
mié. 12/1111:00 amYYZ - ORD
Nonstop1h 59mUnited Airlines
jue. 12/127:19 amORD - YYZ
Nonstop1h 39mUnited Airlines
Deal found 11/19$245
This Flysmarter deal was found by Cheapflights users on 11/20. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/136:35 pmYYZ - ORD
Nonstop1h 57mLufthansa
mar. 12/178:48 amORD - YYZ
1 stop4h 30mLufthansa
Deal found 11/20$259
This Booking.com deal was found by Cheapflights users on 11/19. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/123:50 pmYTZ - MDW
Nonstop1h 50mAir Transat
dom. 12/155:35 pmMDW - YTZ
Nonstop1h 42mAir Transat
Deal found 11/19$260
This CheapTicketsDeal deal was found by Cheapflights users on 11/20. 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 CheapTicketsDeal is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/126:30 amYYZ - MDW
1 stop13h 02mWestJet
lun. 12/169:38 amMDW - YYZ
1 stop12h 56mWestJet
Deal found 11/20$267
This Air Canada deal was found by Cheapflights users on 11/18. 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.
mar. 12/311:15 amYUL - ORD
1 stop4h 36mAir Canada
mié. 12/42:00 pmORD - YUL
1 stop6h 48mAir Canada
Deal found 11/18$268
This Delta deal was found by Cheapflights users on 11/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/126:30 amYYZ - ORD
1 stop9h 13mDelta
jue. 12/197:00 amORD - YYZ
1 stop8h 14mDelta
Deal found 11/19$274
This American Airlines deal was found by Cheapflights users on 11/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/1312:57 pmYUL - ORD
1 stop10h 48mAmerican Airlines
dom. 12/157:00 amORD - YUL
1 stop5h 44mAmerican Airlines
Deal found 11/19$275
This United deal was found by Cheapflights users on 11/20. 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.
lun. 12/166:35 pmYYZ - ORD
Nonstop1h 57mMultiple Airlines
jue. 12/266:06 pmORD - YYZ
1 stop12h 59mMultiple Airlines
Deal found 11/20$278
This Booking.com deal was found by Cheapflights users on 11/19. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/316:50 amYUL - MDW
1 stop4h 30mPorter Airlines
mié. 1/81:05 pmMDW - YUL
1 stop3h 55mPorter Airlines
Deal found 11/19$285

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 2,629,791 searches. Data last updated noviembre 20, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

jue. 12/12

3:50 pm-4:40 pm

Nonstop1h 50m

Chicago Midway

lun. 12/16

12:05 pm-2:47 pm

Nonstop1h 42m

$228

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

mié. 12/11

12:00 pm-6:41 pm

1 stop7h 41m

Chicago O'Hare Intl

jue. 12/12

7:19 am-9:58 am

Nonstop1h 39m

$237

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

sáb. 12/14

8:25 am-2:45 pm

1 stop7h 20m

Chicago O'Hare Intl

vie. 1/10

11:35 am-5:50 pm

1 stop5h 15m

$241

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

mié. 12/11

11:00 am-11:59 am

Nonstop1h 59m

Chicago O'Hare Intl

jue. 12/12

7:19 am-9:58 am

Nonstop1h 39m

$245

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

jue. 12/12

6:25 am-10:54 am

1 stop5h 29m

Chicago O'Hare Intl

dom. 12/15

7:19 am-9:58 am

Nonstop1h 39m

$259

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

jue. 12/12

3:50 pm-4:40 pm

Nonstop1h 50m

Chicago Midway

dom. 12/15

5:35 pm-8:17 pm

Nonstop1h 42m

$260

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

jue. 12/12

12:20 pm-1:11 pm

Nonstop1h 51m

Chicago O'Hare Intl

dom. 12/15

7:19 am-9:58 am

Nonstop1h 39m

$262

TorontoChicago

YYZ - MDW

YYZMDW

Toronto Pearson Intl

jue. 12/12

6:30 am-6:32 pm

1 stop13h 02m

Chicago Midway

lun. 12/16

9:38 am-11:34 pm

1 stop12h 56m

$267

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

mar. 12/3

11:15 am-2:51 pm

1 stop4h 36m

Chicago O'Hare Intl

mié. 12/4

2:00 pm-9:48 pm

1 stop6h 48m

$268

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

jue. 12/12

6:30 am-2:43 pm

1 stop9h 13m

Chicago O'Hare Intl

jue. 12/19

7:00 am-4:14 pm

1 stop8h 14m

$274

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/18

Showing 1-10 of 60 results
1
2
3
...
6

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, September is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of $232). Flying from Region of Ontario to Illinois in June is currently the most expensive (average of $308). 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 noviembre 20, 2024.

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 noviembre 20, 2024.

The most flights from CAON to USIL are scheduled on a Monday (54 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (45 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 noviembre 20, 2024.
See what other customers who have flown with Air Canada, Delta and American 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.
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Overall

8.0

Food

7.2

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

Alaska Airlines
8.0
Very good
9,461 reviews
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Overall

8.0

Food

7.2

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

Delta
8.0
Very good
8,756 reviews
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Overall

8.0

Food

7.2

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

Porter Airlines
7.8
Good
288 reviews
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Overall

8.0

Food

7.2

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

Air Transat
7.8
Good
389 reviews
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Overall

8.0

Food

7.2

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

United Airlines
7.4
Good
9,171 reviews
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Overall

8.0

Food

7.2

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

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?

    $143 is the cheapest one-way deal found within the past few days, from Air Canada. You may also be able to find cheap deals on Porter Airlines and United Airlines, with prices starting from $143 and $147, 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, September is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of $232). Flying from Region of Ontario to Illinois in June is currently the most expensive (average of $308). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Pearson Intl to Newark flights
Toronto Island to Newark flights
Pearson Intl to LaGuardia flights
Pearson Intl to Miami flights
Pearson Intl to John F Kennedy Intl flights
Pierre Elliott Trudeau Intl to Newark flights
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
Pearson Intl to Fort Lauderdale flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Pierre Elliott Trudeau Intl to John F Kennedy Intl flights
Vancouver Intl to Los Angeles flights
Pearson Intl to Las Vegas flights
Pearson Intl to Orlando flights
Pierre Elliott Trudeau Intl to Miami flights
Vancouver Intl to Las Vegas flights
Vancouver Intl to Honolulu flights
Vancouver Intl to Newark flights
Pearson Intl to Dallas/Fort Worth flights
Toronto Island to Fort Lauderdale flights
Vancouver Intl to San Francisco flights
Vancouver Intl to John F Kennedy Intl flights
Pierre Elliott Trudeau Intl to Orlando flights
Pearson Intl to Los Angeles flights
Pearson Intl to San Francisco flights
Pearson Intl to Tampa flights
Toronto Island to Orlando flights
Pearson Intl to West Palm Beach flights
Pearson Intl to O'Hare Intl flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Vancouver Intl to Sky Harbor Intl flights
Pearson Intl to Boston flights
Pearson Intl to Reagan-National flights
Pearson Intl to Hobby flights
Pearson Intl to Sky Harbor Intl flights
Pearson Intl to Fort Myers flights
Vancouver Intl to LaGuardia flights
Vancouver Intl to Miami flights
Pearson Intl to George Bush Intcntl flights
Pearson Intl to Nashville flights
Québec City to Fort Lauderdale flights
Vancouver Intl to O'Hare Intl flights
Calgary to Las Vegas flights
Pierre Elliott Trudeau Intl to O'Hare Intl flights
Vancouver Intl to Palm Springs flights
Ottawa to Fort Lauderdale flights
Vancouver Intl to San Diego flights
Ottawa to Newark flights
Pearson Intl to Dulles Intl flights
Ottawa to Orlando flights

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 2,629,791 searches. Data last updated noviembre 20, 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$157Average$371FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$205Average$294FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$219Average$447FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$236Average$403FlexibilityNo cancel feeOn-time71%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines