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Cheap flights from Ontario to Denver from C$ 190

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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
15 Oct — 22 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Ontario to Denver

Keep the following information in mind while searching for Ontario to Denver flight deals. Data was last updated 15 September 2025.

Round-trip from

C$ 347

One-way from

C$ 190

Popular in

September

Cheapest in

November

Average price

C$ 750

Good round-trip deal

C$ 577 or less

Good one-way deal

C$ 406 or less
United Airlines
  • United Airlines
  • 6/10-20/10
  • 2 total stops
  • 19h 42m total
  • Ontario to Denver
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6/10
  • 6/10
  • 1 total stop
  • 9h 38m total
  • Ontario to Denver
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Highest demand for flights based on searches. 0% potential increase in price (C$ 8 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 16 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Ontario to Denver Intl.
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Price to beat on a one-way flight from Ontario to Denver Intl.
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Find flight deals from Ontario to Denver

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 15 September 2025.

Fri 3/105:25 p.m.YOW - DEN
1 stop8h 05mUnited Airlines
Sat 18/106:00 a.m.DEN - YOW
1 stop6h 04mUnited Airlines
Deal found 15/9C$ 347
Thu 2/105:25 p.m.YOW - DEN
1 stop8h 05mUnited Airlines
Wed 8/108:28 p.m.DEN - YOW
1 stop15h 36mUnited Airlines
Deal found 15/9C$ 363
Thu 20/1111:10 a.m.YOW - DEN
1 stop14h 05mUnited Airlines
Mon 24/1111:59 p.m.DEN - YOW
1 stop12h 28mUnited Airlines
Deal found 14/9C$ 376
Tue 2/125:15 a.m.YOW - DEN
1 stop7h 08mUnited Airlines
Mon 8/124:10 p.m.DEN - YOW
1 stop16h 16mUnited Airlines
Deal found 14/9C$ 378
Sat 27/95:30 p.m.YUL - DEN
1 stop19h 54mMultiple Airlines
Sat 11/108:00 a.m.DEN - YUL
2 stops14h 41mMultiple Airlines
Deal found 13/9C$ 392
Tue 7/103:35 p.m.YOW - DEN
2 stops14h 24mMultiple Airlines
Tue 21/1012:36 a.m.DEN - YOW
1 stop14h 21mMultiple Airlines
Deal found 15/9C$ 399
Sat 27/97:00 a.m.YUL - DEN
1 stop30h 24mWestJet
Mon 29/912:15 p.m.DEN - YUL
2 stops34h 12mWestJet
Deal found 13/9C$ 403
Sat 27/95:30 p.m.YUL - DEN
1 stop19h 54mMultiple Airlines
Wed 8/108:00 a.m.DEN - YUL
2 stops14h 27mMultiple Airlines
Deal found 13/9C$ 406
Tue 7/103:35 p.m.YOW - DEN
2 stops21h 35mMultiple Airlines
Sat 18/1012:36 a.m.DEN - YOW
1 stop14h 21mMultiple Airlines
Deal found 15/9C$ 406
Sat 4/107:15 p.m.YOW - DEN
1 stop18h 09mMultiple Airlines
Wed 22/1010:29 p.m.DEN - YOW
2 stops24h 11mMultiple Airlines
Deal found 15/9C$ 411
Sat 4/106:45 a.m.YUL - DEN
1 stop18h 28mMultiple Airlines
Wed 22/1010:29 p.m.DEN - YUL
2 stops24h 12mMultiple Airlines
Deal found 13/9C$ 426
Sat 4/106:45 a.m.YUL - DEN
1 stop18h 28mMultiple Airlines
Wed 15/108:21 p.m.DEN - YUL
2 stops26h 06mMultiple Airlines
Deal found 13/9C$ 428

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 15 September 2025.
Use the filters below to find and compare flights from Ontario to Denver that are best for you.

Fly from

Ontario

Fly to

Denver

Route

Depart

Return

Price

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Fri 3/10

5:50 p.m.-11:15 p.m.

1 stop7h 25m

Denver Intl

Tue 21/10

11:59 p.m.-2:13 p.m.

1 stop12h 14m

C$ 347

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 7/10

5:25 p.m.-10:00 p.m.

1 stop6h 35m

Denver Intl

Mon 20/10

11:59 p.m.-9:58 a.m.

1 stop7h 59m

C$ 347

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Fri 3/10

2:48 p.m.-9:18 p.m.

1 stop8h 30m

Denver Intl

Sun 19/10

6:00 a.m.-9:35 p.m.

1 stop13h 35m

C$ 347

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 4/10

12:54 p.m.-5:48 p.m.

1 stop6h 54m

Denver Intl

Mon 20/10

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

1 stop7h 12m

C$ 347

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 6/10

5:50 p.m.-11:18 p.m.

1 stop7h 28m

Denver Intl

Wed 22/10

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

1 stop7h 12m

C$ 347

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Fri 3/10

5:25 p.m.-11:30 p.m.

1 stop8h 05m

Denver Intl

Sat 18/10

6:00 a.m.-2:04 p.m.

1 stop6h 04m

C$ 347

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 4/10

7:29 p.m.-11:57 p.m.

1 stop6h 28m

Denver Intl

Tue 21/10

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

1 stop7h 12m

C$ 347

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 6/10

5:50 p.m.-11:18 p.m.

1 stop7h 28m

Denver Intl

Sun 19/10

6:00 a.m.-9:35 p.m.

1 stop13h 35m

C$ 347

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 6/10

7:29 p.m.-11:57 p.m.

1 stop6h 28m

Denver Intl

Tue 21/10

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

1 stop7h 12m

C$ 347

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 7/10

6:33 a.m.-2:42 p.m.

1 stop10h 09m

Denver Intl

Sun 19/10

6:00 a.m.-9:35 p.m.

1 stop13h 35m

C$ 347

Flights are sorted by cheapest round-trip flights first.

Deals found on 13/9

Showing 1-10 of 60 results
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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

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$ 320). Flying from Region of Ontario to Denver in December is currently the most expensive (average of C$ 484). 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 15 September 2025.

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 15 September 2025.

The most flights from CAON to DEN are scheduled on a Monday (11 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (10 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 7h 25m. United Airlines provides one of the quickest options available for as low as C$ 347. Airlines will cover a distance of 2435 km. This flight may include one or multiple stops.

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

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as C$ 198. Users have also found prices from C$ 212 and C$ 228 on United Airlines and Air Canada, respectively.

  • 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: Air Canada (57%), United Airlines (57%), Austrian Airlines( 27%).

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

    On average you can expect to pay C$ 1,964 for a flight from Region of Ontario to Denver. The cheapest flight overall is C$ 304 while the most popular route, (Toronto Pearson Intl - Denver Intl) is currently priced at C$ 316.

  • 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$ 320). Flying from Region of Ontario to Denver in December is currently the most expensive (average of C$ 484). 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
Westminster
Thornton

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Alternative routes for Ontario to Denver

See prices for flight routes from nearby airports that may be better suited for you.
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Vancouver Intl to Denver flights
Pierre Elliott Trudeau Intl to Denver flights
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Region of Waterloo Intl to Denver flights
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Ottawa to Colorado Springs flights
Pearson Intl to Vail flights
Québec City to Denver flights
Vancouver Intl to Colorado Springs flights
Pierre Elliott Trudeau Intl to Grand Junction flights
Pearson Intl to Montrose flights
Pearson Intl to Durango flights
Hamilton to Denver flights
Winnipeg to Colorado Springs flights
Pearson Intl to Aspen flights
Windsor to Denver flights
St. John's to Denver flights
Vancouver Intl to Grand Junction flights
Pearson Intl to Gunnison flights
Vancouver Intl to Aspen flights
Prince George to Denver flights
Moncton to Denver flights
Victoria to Durango flights
Calgary to Aspen flights

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 15 September 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 260AverageC$ 457FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 305AverageC$ 622FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 367AverageC$ 675FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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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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