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Cheap flights from Ontario to Chicago from C$ 157

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 26/5. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — CHI
19 May — 26 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Chicago

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to Chicago
Explore the most affordable flight options available from Ontario to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 April 2026.

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 15/4C$ 255
Fri 22/56:30 a.m.
YUL
-
MDW
1 stop4h 15m
Porter Airlines
Fri 29/53:20 p.m.
MDW
-
YUL
1 stop3h 50m
Porter Airlines
Deal found 16/4C$ 260
Tue 5/51:45 p.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Fri 8/53:20 p.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 19/4C$ 279
Thu 3/91:40 p.m.
YTZ
-
ORD
Nonstop1h 55m
Porter Airlines
Sun 6/911:45 a.m.
ORD
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 18/4C$ 279
Tue 26/512:25 p.m.
YYZ
-
ORD
Nonstop2h 00m
Air Canada
Sun 31/59:55 a.m.
ORD
-
YYZ
Nonstop1h 40m
Air Canada
Deal found 15/4C$ 281
Wed 13/51:45 p.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Wed 20/510:30 a.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 15/4C$ 281
Fri 22/511:00 a.m.
YYZ
-
ORD
Nonstop2h 00m
United Airlines
Mon 25/59:15 p.m.
ORD
-
YYZ
Nonstop1h 44m
United Airlines
Deal found 16/4C$ 282
Sat 9/58:55 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Sun 10/510:30 a.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 14/4C$ 282
Thu 25/67:20 p.m.
YTZ
-
ORD
Nonstop1h 56m
Air Canada
Wed 1/77:25 a.m.
ORD
-
YTZ
Nonstop1h 41m
Air Canada
Deal found 17/4C$ 282
Tue 26/58:55 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Tue 2/63:20 p.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 14/4C$ 283
Thu 24/91:40 p.m.
YTZ
-
ORD
Nonstop1h 55m
Porter Airlines
Mon 28/93:20 p.m.
ORD
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 17/4C$ 283
Sat 9/510:30 a.m.
YYZ
-
ORD
1 stop5h 23m
Air Canada
Tue 12/59:55 a.m.
ORD
-
YYZ
Nonstop1h 40m
Air Canada
Deal found 17/4C$ 285

Find flight deals from Ontario to Chicago

Keep the following information in mind while searching for Ontario to Chicago flight deals. Data was last updated 19 April 2026.

Round-trip from

C$ 255

One-way from

C$ 157

Popular in

April

Cheapest in

July

Average price

C$ 437

Good round-trip deal

C$ 265 or less

Good one-way deal

C$ 159 or less
Porter Airlines
  • Porter Airlines
  • 4/6-7/6
  • 2 total stops
  • 10h 00m total
  • Ontario to Chicago
Search Deals
Porter Airlines
  • Porter Airlines
  • 26/5
  • 1 total stop
  • 5h 00m total
  • Ontario to Chicago
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 39 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 April 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Chicago (CHI).
Search Deals
Price to beat on a one-way flight from Ontario to Chicago (CHI).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Chicago 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 19 April 2026.
Use the filters below to find and compare flights from Ontario to Chicago that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Mon 11/5

2:45 p.m.-3:43 p.m.

Nonstop1h 58m

Chicago O'Hare Intl

Tue 12/5

9:04 a.m.-11:49 a.m.

Nonstop1h 45m

C$ 282

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 4/6

5:15 p.m.-6:18 p.m.

Nonstop2h 03m

Chicago O'Hare Intl

Sun 7/6

7:09 a.m.-9:54 a.m.

Nonstop1h 45m

C$ 282

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Wed 27/5

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

Nonstop2h 05m

Chicago O'Hare Intl

Sun 31/5

9:20 p.m.-11:59 p.m.

Nonstop1h 39m

C$ 282
Quickest round-trip

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Tue 5/5

1:45 p.m.-2:35 p.m.

Nonstop1h 50m

Chicago Midway

Mon 11/5

10:30 a.m.-1:10 p.m.

Nonstop1h 40m

C$ 297

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 24/8

1:45 p.m.-2:35 p.m.

Nonstop1h 50m

Chicago Midway

Mon 31/8

3:20 p.m.-6:00 p.m.

Nonstop1h 40m

C$ 304

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 28/5

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

Nonstop2h 00m

Chicago O'Hare Intl

Sun 31/5

7:09 a.m.-9:54 a.m.

Nonstop1h 45m

C$ 312

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 7/5

8:55 a.m.-9:45 a.m.

Nonstop1h 50m

Chicago Midway

Thu 7/5

3:20 p.m.-6:00 p.m.

Nonstop1h 40m

C$ 313

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Sat 6/6

7:00 a.m.-8:00 a.m.

Nonstop2h 00m

Chicago O'Hare Intl

Tue 9/6

3:53 p.m.-11:54 p.m.

1 stop7h 01m

C$ 313

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Sat 6/6

7:00 a.m.-8:00 a.m.

Nonstop2h 00m

Chicago O'Hare Intl

Wed 10/6

7:10 a.m.-1:47 p.m.

1 stop5h 37m

C$ 313

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 29/5

1:45 p.m.-2:35 p.m.

Nonstop1h 50m

Chicago Midway

Sun 31/5

3:20 p.m.-6:00 p.m.

Nonstop1h 40m

C$ 318

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/4

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago 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 Chicago

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

Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Chicago (average of C$ 308). Flying from Region of Ontario to Chicago in January is currently the most expensive (average of C$ 1,066). 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 CHI?

Find hourly flight availability from Ontario to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 19 April 2026.

Unlike in the evening, when flights are generally more expensive, you can save up to 32% on flights from Region of Ontario to Chicago by exploring options for tickets at noon.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to Chicago. Price data was last updated on 18 April 2026.

Travelers seeking maximum savings on their Region of Ontario to Chicago 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 Chicago

Explore weekly flight availability from Ontario to Chicago. 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 19 April 2026.

The most flights from CAON to CHI are scheduled on a Monday (70 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (45 on average).

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

Related info for your journey

Find useful and relevant information for your journey from Ontario to Chicago. 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 Chicago?

    For as low as C$ 297, United Airlines can have you in Chicago from Region of Ontario in 1h 50m. Region of Ontario and Chicago are separated by a distance of 711 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    The cheapest airline one-way is Porter Airlines, with whom users have recently found tickets for as low as C$ 122. However, be on the lookout for offers from Air Canada and United Airlines, as they are both options that can get you from Region of Ontario to Chicago for a low price.

  • What are the most popular routes from Region of Ontario to Chicago?

    When deciding which route to take from Region of Ontario to Chicago consider Toronto Pearson Intl - Chicago O'Hare Intl, Montreal Pierre Elliott Trudeau Intl - Chicago O'Hare Intl or Toronto Island - Chicago Midway as they are the most popular.

  • What are the most reliable airlines from Region of Ontario to Chicago?

    No one likes to see their flight delayed. When booking a flight from Region of Ontario to Chicago consider choosing Copa Airlines (91%), EVA Air (78%) or Republic Airways (73%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Region of Ontario to Chicago?

    On average you can expect to pay C$ 1,297 for a flight from Region of Ontario to Chicago. The cheapest flight overall is C$ 227 while the most popular route, (Toronto Pearson Intl - Chicago O'Hare Intl) is currently priced at C$ 272.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Chicago 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 Chicago?

    Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Chicago (average of C$ 308). Flying from Region of Ontario to Chicago in January is currently the most expensive (average of C$ 1,066). 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 Chicago

See prices for flight routes from nearby airports that may be better suited for you.
Pearson Intl to O'Hare Intl flights
Pierre Elliott Trudeau Intl to O'Hare Intl flights
Toronto Island to Midway flights
Pearson Intl to Midway flights
Vancouver Intl to O'Hare Intl flights
Toronto Island to O'Hare Intl flights
Pierre Elliott Trudeau Intl to Midway flights
Calgary to O'Hare Intl flights
Halifax to O'Hare Intl flights
Vancouver Intl to Midway flights
Pearson Intl to St. Louis flights
Winnipeg to O'Hare Intl flights
Ottawa to O'Hare Intl flights
Québec City to O'Hare Intl flights
Halifax to Midway flights
Edmonton to O'Hare Intl flights
Calgary to Midway flights
Hamilton to O'Hare Intl flights
Ottawa to Midway flights
Pierre Elliott Trudeau Intl to St. Louis flights
Vancouver Intl to St. Louis flights
Edmonton to Midway flights
Calgary to St. Louis flights
Québec City to Midway flights
Region of Waterloo Intl to O'Hare Intl flights
Regina to O'Hare Intl flights
Saskatoon to O'Hare Intl flights
London to O'Hare Intl flights
Kelowna to O'Hare Intl flights
Kelowna to Midway flights
Sudbury to O'Hare Intl flights
Pearson Intl to Bloomington flights
Ottawa to St. Louis flights
Saskatoon to St. Louis flights
Pearson Intl to Champaign flights
Nanaimo to O'Hare Intl flights
Victoria to O'Hare Intl flights
Victoria to Midway flights
Edmonton to St. Louis flights
Saskatoon to Midway flights
Victoria to St. Louis flights
St. John's to O'Hare Intl flights
Vancouver Intl to Peoria flights
Moncton to O'Hare Intl flights
Pearson Intl to Peoria flights
Halifax to St. Louis flights
Québec City to St. Louis flights

Top 5 airlines flying from Ontario to Chicago

Discover the top 5 airlines that operate flights from Ontario to Chicago. 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 19 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 112AverageC$ 349FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
American AirlinesCheapestC$ 222AverageC$ 411FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapestC$ 242AverageC$ 456FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 264AverageC$ 481FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 365AverageC$ 470FlexibilityNo 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 Chicago?

When you search for this flight from Ontario to Chicago, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Chicago from Ontario.

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

Certainly. Search results for flights to Chicago from Ontario shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Not ready to book yet? You can track prices for flights from Ontario to Chicago on Cheapflights with our Price Alert feature and get notified when better prices are available.

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