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Cheap flights from Ontario to Illinois from C$ 146

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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Illinois

Enter your travel dates to find the best prices.

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 12 December 2025.

Wed 31/129:00 a.m.YYZ - ORD
Nonstop2h 05mUnited Airlines
Thu 1/18:51 a.m.ORD - YYZ
1 stop13h 55mUnited Airlines
Deal found 10/12C$ 319
Thu 25/127:40 p.m.YYZ - ORD
1 stop13h 07mUnited Airlines
Thu 1/18:51 a.m.ORD - YYZ
1 stop13h 55mUnited Airlines
Deal found 10/12C$ 325
Sat 27/126:45 a.m.YUL - MDW
1 stop4h 20mPorter Airlines
Mon 23/211:00 a.m.MDW - YUL
1 stop4h 30mPorter Airlines
Deal found 11/12C$ 328
Thu 25/128:00 a.m.YUL - ORD
1 stop6h 01mAir Canada
Tue 30/128:30 p.m.ORD - YUL
1 stop12h 16mAir Canada
Deal found 11/12C$ 367
Wed 31/129:15 a.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Thu 1/14:15 p.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 10/12C$ 374
Fri 26/126:50 a.m.YYZ - ORD
Nonstop2h 13mUnited Airlines
Wed 31/126:21 p.m.ORD - YYZ
1 stop4h 25mUnited Airlines
Deal found 10/12C$ 376
Thu 25/129:10 a.m.YUL - ORD
1 stop4h 51mAir Canada
Sun 28/128:30 p.m.ORD - YUL
1 stop4h 23mAir Canada
Deal found 11/12C$ 376
Wed 24/129:15 a.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Sun 18/111:00 a.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 9/12C$ 379
Sat 27/126:00 a.m.YUL - ORD
1 stop5h 05mAir Canada
Mon 23/210:35 a.m.ORD - YUL
Nonstop2h 25mAir Canada
Deal found 11/12C$ 389
Fri 26/127:40 p.m.YYZ - ORD
1 stop5h 04mUnited Airlines
Tue 6/11:00 p.m.ORD - YYZ
1 stop6h 42mUnited Airlines
Deal found 10/12C$ 400
Thu 25/1210:10 a.m.YUL - ORD
1 stop6h 00mAir Canada
Sat 3/18:40 p.m.ORD - YUL
1 stop4h 13mAir Canada
Deal found 9/12C$ 401
Sat 27/129:15 a.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Tue 6/111:05 a.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 10/12C$ 408

Find flight deals from Ontario to Illinois

Keep the following information in mind while searching for Ontario to Illinois flight deals. Data was last updated 12 December 2025.

Round-trip from

C$ 247

One-way from

C$ 146

Popular in

December

Cheapest in

July

Average price

C$ 441

Good round-trip deal

C$ 244 or less

Good one-way deal

C$ 152 or less
25/1-28/1
  • 25/1-28/1
  • 4 total stops
  • 48h 48m total
  • Ontario to Illinois
Search Deals
11/1
  • 11/1
  • 3 total stops
  • 29h 43m total
  • Ontario to Illinois
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (C$ 51 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Ontario to Illinois.
Search Deals
Price to beat on a one-way flight from Ontario to Illinois.
Search Deals

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 629,999 searches. Data last updated 12 December 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

Fri 20/2

9:15 a.m.-10:05 a.m.

Nonstop1h 50m

Chicago Midway

Mon 23/2

11:00 a.m.-1:42 p.m.

Nonstop1h 42m

C$ 247

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Sun 25/1

9:15 a.m.-10:05 a.m.

Nonstop1h 50m

Chicago Midway

Sun 1/2

11:00 a.m.-1:42 p.m.

Nonstop1h 42m

C$ 258

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Wed 18/2

9:25 a.m.-11:06 a.m.

Nonstop2h 41m

Chicago O'Hare Intl

Sun 22/2

12:50 p.m.-4:01 p.m.

Nonstop2h 11m

C$ 259

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

Sat 14/2

8:55 a.m.-11:50 a.m.

1 stop3h 55m

Chicago Midway

Tue 17/2

11:00 a.m.-6:45 p.m.

1 stop6h 45m

C$ 259

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Thu 5/2

3:50 p.m.-5:50 p.m.

Nonstop3h 00m

Chicago O'Hare Intl

Sun 8/2

11:50 a.m.-3:08 p.m.

Nonstop2h 18m

C$ 268

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 26/1

9:15 a.m.-10:05 a.m.

Nonstop1h 50m

Chicago Midway

Thu 29/1

11:00 a.m.-1:42 p.m.

Nonstop1h 42m

C$ 269

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 23/2

9:20 a.m.-10:10 a.m.

Nonstop1h 50m

Chicago Midway

Mon 16/3

4:15 p.m.-6:57 p.m.

Nonstop1h 42m

C$ 281

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 29/1

3:30 p.m.-4:40 p.m.

Nonstop2h 10m

Chicago O'Hare Intl

Sun 1/2

4:50 p.m.-7:45 p.m.

Nonstop1h 55m

C$ 287

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 5/2

9:15 a.m.-10:05 a.m.

Nonstop1h 50m

Chicago Midway

Sun 8/2

11:00 a.m.-1:42 p.m.

Nonstop1h 42m

C$ 288

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 19/2

7:45 a.m.-1:22 p.m.

1 stop6h 37m

Chicago O'Hare Intl

Mon 23/2

9:35 a.m.-4:14 p.m.

1 stop5h 39m

C$ 292

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

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, April is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of C$ 113). Flying from Region of Ontario to Illinois in February is currently the most expensive (average of C$ 254). 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 12 December 2025.

A simple way to save on the total cost of your ticket is to fly from Region of Ontario to Illinois in the afternoon. If you’re flexible enough to do this you can expect to save up to 7% on your trip compared to booking a flight at noon.

What is the cheapest day to fly from Region of Ontario to Illinois?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Illinois. Price data was last updated on 16 December 2024.

Travelers seeking maximum savings on their Region of Ontario to Illinois flight should consider departing on Sunday mornings when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 12 December 2025.

The most flights from CAON to USIL are scheduled on a Monday (60 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (36 on average).

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 12 December 2025.
Read reviews from past customers who have flown Porter Airlines,United Airlines, andAmerican Airlines from Ontario to Illinois. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
397 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Porter Airlines
8.0
Very good
397 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
United Airlines
7.4
Good
9,095 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
American Airlines
7.2
Good
11,049 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
WestJet
7.2
Good
3,194 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Air Canada
7.1
Good
10,514 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out

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.

  • How long is the flight from Region of Ontario to Illinois?

    Porter Airlines, Air Canada, and American Airlines can get you from Region of Ontario to Illinois in just under 1h 50m. Your travel time will be generally consistent. The distance between Region of Ontario and Illinois is about 711 km. All flights are typically direct.

  • What are the cheapest airlines to fly from Region of Ontario to Illinois one-way?

    For one-way options, check prices for Porter Airlines. According to our data, you can fly for as low as C$ 123. Users have also found prices from C$ 157 and C$ 162 on Air Transat and United Airlines, 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, April is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of C$ 113). Flying from Region of Ontario to Illinois in February is currently the most expensive (average of C$ 254). 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

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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 5 airlines flying from Ontario to Illinois

Discover the top 5 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 629,999 searches. Data last updated 12 December 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 195AverageC$ 349FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 258AverageC$ 474FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 259AverageC$ 422FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 266AverageC$ 542FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 368AverageC$ 499FlexibilityNo cancel feeOn-time60%
Search WestJet flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario to Illinois?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Illinois. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Illinois?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Ontario to Illinois.

Can Cheapflights find flights from Ontario to Illinois with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Ontario to Illinois flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Ontario to Illinois become cheaper?

Yes, Cheapflights offers price alerts on Ontario to Illinois flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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