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Cheap flights from Ontario to Denver from C$ 204

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 27/5. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
3 Jun — 10 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Denver

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to Denver
Explore the most affordable flight options available from Ontario to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 May 2026.

Thu 21/58:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Tue 26/512:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 30/4C$ 368
Sat 23/55:30 p.m.
YUL
-
DEN
1 stop19h 50m
WestJet
Tue 26/512:15 p.m.
DEN
-
YUL
2 stops34h 10m
WestJet
Deal found 30/4C$ 410
Wed 3/67:15 a.m.
YUL
-
DEN
1 stop30h 05m
WestJet
Mon 31/812:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 30/4C$ 429
Tue 26/56:45 a.m.
YUL
-
DEN
2 stops30h 35m
WestJet
Sat 6/612:15 p.m.
DEN
-
YUL
2 stops26h 30m
WestJet
Deal found 30/4C$ 440
Wed 2/98:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Mon 7/912:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 1/5C$ 444
Fri 7/88:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Sun 23/812:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 1/5C$ 447
Wed 17/65:45 p.m.
YUL
-
DEN
2 stops19h 35m
WestJet
Wed 24/612:15 p.m.
DEN
-
YUL
2 stops34h 10m
WestJet
Deal found 3/5C$ 448
Fri 29/57:15 a.m.
YUL
-
DEN
1 stop30h 05m
WestJet
Fri 5/612:15 p.m.
DEN
-
YUL
2 stops26h 30m
WestJet
Deal found 2/5C$ 450
Thu 18/66:15 p.m.
YOW
-
DEN
2 stops19h 05m
WestJet
Wed 24/612:15 p.m.
DEN
-
YOW
1 stop27h 00m
WestJet
Deal found 29/4C$ 496
Mon 1/66:15 p.m.
YOW
-
DEN
2 stops19h 05m
WestJet
Thu 4/612:15 p.m.
DEN
-
YOW
1 stop27h 00m
WestJet
Deal found 1/5C$ 497
Tue 19/54:15 p.m.
YOW
-
DEN
1 stop21h 05m
WestJet
Thu 21/512:15 p.m.
DEN
-
YOW
1 stop15h 20m
WestJet
Deal found 3/5C$ 506
Wed 10/66:10 p.m.
YHM
-
DEN
1 stop19h 10m
WestJet
Tue 23/612:15 p.m.
DEN
-
YHM
1 stop27h 00m
WestJet
Deal found 2/5C$ 506

Find flight deals from Ontario to Denver

Keep the following information in mind while searching for Ontario to Denver flight deals. Data was last updated 4 May 2026.

Round-trip from

C$ 368

One-way from

C$ 204

Popular in

February

Cheapest in

November

Average price

C$ 631

Good round-trip deal

C$ 603 or less

Good one-way deal

C$ 369 or less
WestJet
  • WestJet
  • 21/5-26/5
  • 2 total stops
  • 26h 50m total
  • Ontario to Denver
Search Deals
27/5
  • 27/5
  • 1 total stop
  • 16h 49m total
  • Ontario to Denver
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 53 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Denver Intl.
Search Deals
Price to beat on a one-way flight from Ontario to Denver Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Denver 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 4 May 2026.
Use the filters below to find and compare flights from Ontario to Denver that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Thu 21/5

7:20 p.m.-11:20 a.m.

2 stops18h 00m

Denver Intl

Tue 26/5

12:15 p.m.-11:45 p.m.

1 stop9h 30m

C$ 376

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Fri 9/10

7:20 p.m.-11:20 a.m.

2 stops42h 00m

Denver Intl

Mon 12/10

12:15 p.m.-11:45 p.m.

1 stop9h 30m

C$ 504

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 1/6

6:15 p.m.-11:20 a.m.

2 stops19h 05m

Denver Intl

Thu 4/6

12:15 p.m.-12:30 p.m.

2 stops22h 15m

C$ 504

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Wed 10/6

6:10 p.m.-11:20 a.m.

1 stop19h 10m

Denver Intl

Tue 23/6

12:15 p.m.-5:15 p.m.

1 stop27h 00m

C$ 506

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sun 14/6

4:15 p.m.-11:20 a.m.

1 stop21h 05m

Denver Intl

Tue 14/7

12:15 p.m.-3:20 p.m.

1 stop25h 05m

C$ 522

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Sun 30/8

6:10 p.m.-11:20 a.m.

1 stop19h 10m

Denver Intl

Wed 2/9

12:15 p.m.-5:15 p.m.

1 stop27h 00m

C$ 546

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Thu 20/8

6:10 p.m.-11:20 a.m.

1 stop19h 10m

Denver Intl

Thu 27/8

12:15 p.m.-5:15 p.m.

1 stop27h 00m

C$ 553

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Fri 14/8

6:10 p.m.-11:20 a.m.

1 stop19h 10m

Denver Intl

Sat 22/8

12:15 p.m.-5:15 p.m.

1 stop27h 00m

C$ 561

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 14/6

10:25 p.m.-11:20 a.m.

1 stop14h 55m

Denver Intl

Sat 20/6

8:46 p.m.-8:55 p.m.

1 stop22h 09m

C$ 563

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Fri 10/7

8:40 p.m.-11:20 a.m.

1 stop16h 40m

Denver Intl

Sun 12/7

12:15 p.m.-7:50 p.m.

1 stop29h 35m

C$ 567

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/4

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

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

How far ahead should I book a flight from Region of Ontario to Denver?

The best time to book flights from Region of Ontario to Denver is 75 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of C$ 177). Flying from Region of Ontario to Denver in January is currently the most expensive (average of C$ 401). 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 DEN?

Find hourly flight availability from Ontario to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 May 2026.

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 Denver as you normally would.

Weekly flight availability from Region of Ontario to Denver

Explore weekly flight availability from Ontario to Denver. 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 4 May 2026.

The most flights from CAON to DEN are scheduled on a Monday (10 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

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

Related info for your journey

Find useful and relevant information for your journey from Ontario to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Denver from Ontario?

    If you book a flight to Denver from Ontario, you will be flying to Denver Intl, which is the city’s only airport. Denver Intl (DEN) is located 29.7 km from the centre of Denver.

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

    A quick flight from Region of Ontario to Denver can take about 3h 42m. WestJet provides one of the quickest options available for as low as C$ 621. Airlines will cover a distance of 2111 km. This flight may include one or multiple stops.

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

    Most travellers choose Toronto Pearson Intl - Denver Intl, Montreal Pierre Elliott Trudeau Intl - Denver Intl or Toronto Island - Denver Intl when deciding on the best route from Region of Ontario to Denver.

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

    Before booking your flight to Denver from Region of Ontario, check out the most reliable airlines to get you to your destination on time: Brussels Airlines (92%), Air Canada (74%), United Airlines( 66%).

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

    On average you can expect to pay C$ 1,255 for a flight from Region of Ontario to Denver. The cheapest flight overall is C$ 291 while the most popular route, (Toronto Pearson Intl - Denver Intl) is currently priced at C$ 455.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of C$ 177). Flying from Region of Ontario to Denver in January is currently the most expensive (average of C$ 401). 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

Travelling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Golden
Thornton
Black Hawk

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Top 3 airlines flying from Ontario to Denver

Discover the top 3 airlines that operate flights from Ontario to Denver. 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 4 May 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 300AverageC$ 642FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 324AverageC$ 461FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 389AverageC$ 642FlexibilityNo cancel feeOn-time67%
Search Air Canada 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 Denver?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Denver. 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 Denver?

Cheapflights helps you find that perfect flight to Denver from Ontario by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

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

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

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

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