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Cheap flights from Ontario to Illinois from C$ 138

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 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
28 Feb — 7 Mar1
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 29 January 2026.

Thu 26/39:25 a.m.
YUL
-
ORD
Nonstop2h 53m
Air Canada
Mon 30/312:50 p.m.
ORD
-
YUL
Nonstop2h 15m
Air Canada
Deal found 27/1C$ 247
Fri 1/56:30 a.m.
YUL
-
MDW
1 stop4h 10m
Porter Airlines
Mon 4/510:25 a.m.
MDW
-
YUL
1 stop5h 50m
Porter Airlines
Deal found 27/1C$ 248
Thu 19/26:25 p.m.
YUL
-
ORD
Nonstop2h 45m
Air Canada
Sat 21/27:15 a.m.
ORD
-
YUL
Nonstop2h 05m
Air Canada
Deal found 28/1C$ 250
Thu 19/24:45 p.m.
YUL
-
ORD
Nonstop3h 00m
United Airlines
Sat 21/28:50 a.m.
ORD
-
YUL
1 stop5h 26m
United Airlines
Deal found 27/1C$ 251
Thu 4/66:30 a.m.
YUL
-
MDW
1 stop4h 10m
Porter Airlines
Sun 7/610:25 a.m.
MDW
-
YUL
1 stop5h 50m
Porter Airlines
Deal found 27/1C$ 253
Fri 19/67:00 a.m.
YYZ
-
ORD
Nonstop2h 00m
United Airlines
Sun 21/69:15 p.m.
ORD
-
YYZ
Nonstop1h 44m
United Airlines
Deal found 27/1C$ 257
Thu 19/22:15 p.m.
YYZ
-
ORD
Nonstop1h 55m
Air Canada
Mon 2/38:40 p.m.
ORD
-
YYZ
Nonstop1h 39m
Air Canada
Deal found 27/1C$ 258
Thu 11/68:15 a.m.
YUL
-
ORD
Nonstop2h 38m
Air Canada
Sun 14/68:45 a.m.
ORD
-
YUL
Nonstop2h 15m
Air Canada
Deal found 27/1C$ 258
Thu 19/28:45 a.m.
YYZ
-
ORD
Nonstop2h 05m
Lufthansa
Mon 23/26:28 p.m.
ORD
-
YYZ
Nonstop1h 53m
Lufthansa
Deal found 27/1C$ 261
Thu 5/39:15 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Fri 6/311:00 a.m.
MDW
-
YTZ
Nonstop1h 42m
Porter Airlines
Deal found 28/1C$ 261
Thu 19/28:00 a.m.
YYZ
-
ORD
1 stop7h 55m
Air Canada
Mon 23/210:00 a.m.
ORD
-
YYZ
Nonstop1h 40m
Air Canada
Deal found 26/1C$ 262
Mon 9/39:15 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Mon 16/311:00 a.m.
MDW
-
YTZ
Nonstop1h 42m
Porter Airlines
Deal found 28/1C$ 263

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 29 January 2026.

Round-trip from

C$ 247

One-way from

C$ 138

Popular in

January

Cheapest in

July

Average price

C$ 398

Good round-trip deal

C$ 261 or less

Good one-way deal

C$ 186 or less
Air Canada
  • Air Canada
  • 26/3-30/3
  • Nonstop
  • 5h 08m total
  • Ontario to Illinois
Search Deals
Porter Airlines
  • Porter Airlines
  • 12/3
  • 1 total stop
  • 4h 15m total
  • Ontario to Illinois
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 57 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 29 January 2026.
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

YYZ - ORD

YYZORD

Toronto Pearson Intl

Sat 20/6

9:00 p.m.-10:05 p.m.

Nonstop2h 05m

Chicago O'Hare Intl

Tue 23/6

9:15 p.m.-11:59 p.m.

Nonstop1h 44m

C$ 257

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Wed 6/5

8:50 a.m.-9:50 a.m.

Nonstop2h 00m

Chicago O'Hare Intl

Sat 9/5

9:15 p.m.-11:59 p.m.

Nonstop1h 44m

C$ 257

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Tue 17/2

8:45 a.m.-9:50 a.m.

Nonstop2h 05m

Chicago O'Hare Intl

Tue 24/2

1:12 p.m.-4:02 p.m.

Nonstop1h 50m

C$ 257

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 5/3

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

Nonstop1h 50m

Chicago Midway

Fri 6/3

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

Nonstop1h 42m

C$ 261

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 9/3

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

Nonstop1h 50m

Chicago Midway

Mon 16/3

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

Nonstop1h 42m

C$ 263

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

Thu 12/3

6:50 a.m.-10:05 a.m.

1 stop4h 15m

Chicago Midway

Mon 16/3

11:00 a.m.-5:45 p.m.

1 stop5h 45m

C$ 263

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

Tue 10/3

7:00 a.m.-11:18 a.m.

1 stop5h 18m

Chicago O'Hare Intl

Tue 31/3

12:50 p.m.-7:52 p.m.

1 stop6h 02m

C$ 266

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 19/2

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

Nonstop1h 50m

Chicago Midway

Mon 23/2

11:05 a.m.-1:47 p.m.

Nonstop1h 42m

C$ 270

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Mon 6/4

6:15 a.m.-10:53 a.m.

1 stop5h 38m

Chicago O'Hare Intl

Mon 13/4

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

Nonstop1h 42m

C$ 270

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 19/2

8:45 a.m.-9:50 a.m.

Nonstop2h 05m

Chicago O'Hare Intl

Mon 2/3

6:20 p.m.-11:46 p.m.

1 stop4h 26m

C$ 270

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/1

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$ 111). Flying from Region of Ontario to Illinois in February is currently the most expensive (average of C$ 250). 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 29 January 2026.

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 19% on your trip compared to booking a flight in the evening.

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 24 January 2026.

Travelers seeking maximum savings on their Region of Ontario to Illinois flight should consider departing on Monday 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 29 January 2026.

The most flights from CAON to USIL are scheduled on a Monday (62 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (47 on average).

How much does it cost to fly round-trip from Region of Ontario to Illinois?

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 29 January 2026.
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
7.9
Good
412 reviews
Check prices

Entertainment

6.9

Food

7.5

Overall

7.9

Crew

8.6

Boarding

8.2

Comfort

7.9

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
7.9
Good
412 reviews
Porter Airlines
7.9
Good
412 reviews
Check prices

Entertainment

6.9

Food

7.5

Overall

7.9

Crew

8.6

Boarding

8.2

Comfort

7.9

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
9,213 reviews
Porter Airlines
7.9
Good
412 reviews
Check prices

Entertainment

6.9

Food

7.5

Overall

7.9

Crew

8.6

Boarding

8.2

Comfort

7.9

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
11,206 reviews
Porter Airlines
7.9
Good
412 reviews
Check prices

Entertainment

6.9

Food

7.5

Overall

7.9

Crew

8.6

Boarding

8.2

Comfort

7.9

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
3,251 reviews
Porter Airlines
7.9
Good
412 reviews
Check prices

Entertainment

6.9

Food

7.5

Overall

7.9

Crew

8.6

Boarding

8.2

Comfort

7.9

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
10,666 reviews
Porter Airlines
7.9
Good
412 reviews
Check prices

Entertainment

6.9

Food

7.5

Overall

7.9

Crew

8.6

Boarding

8.2

Comfort

7.9

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?

    United Airlines, Porter Airlines, and Air Canada can get you from Region of Ontario to Illinois in just under 1h 50m. Your travel time can differ by up to 3h 28m. The distance between Region of Ontario and Illinois is about 711 km. This flight may include one or multiple stops.

  • 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$ 121. Users have also found prices from C$ 155 and C$ 158 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$ 111). Flying from Region of Ontario to Illinois in February is currently the most expensive (average of C$ 250). 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 29 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 111AverageC$ 340FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
American AirlinesCheapestC$ 220AverageC$ 405FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapestC$ 243AverageC$ 462FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 256AverageC$ 518FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 362AverageC$ 466FlexibilityNo 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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