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Cheap flights from Ontario to Denver from C$ 230

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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
1 Sep — 8 Sep1
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 2 August 2026.

Fri 4/96:30 p.m.
YUL
-
DEN
1 stop29h 14m
United Airlines
Sun 6/99:40 a.m.
DEN
-
YUL
Nonstop3h 48m
United Airlines
Deal found 30/7C$ 502
Tue 25/812:55 p.m.
YYZ
-
DEN
1 stop20h 39m
Multiple Airlines
Thu 3/98:31 a.m.
DEN
-
YYZ
1 stop11h 24m
Multiple Airlines
Deal found 28/7C$ 539
Fri 18/97:25 a.m.
YYZ
-
DEN
2 stops14h 12m
Multiple Airlines
Wed 23/97:30 a.m.
DEN
-
YYZ
1 stop10h 39m
Multiple Airlines
Deal found 1/8C$ 541
Sat 12/910:50 a.m.
YTZ
-
DEN
1 stop8h 26m
Multiple Airlines
Sat 26/96:38 p.m.
DEN
-
YTZ
2 stops16h 17m
Multiple Airlines
Deal found 29/7C$ 542
Thu 24/99:50 a.m.
YYZ
-
DEN
1 stop23h 47m
Multiple Airlines
Mon 28/910:38 a.m.
DEN
-
YYZ
1 stop9h 17m
Multiple Airlines
Deal found 28/7C$ 542
Sat 5/91:45 p.m.
YTZ
-
DEN
1 stop29h 00m
Multiple Airlines
Mon 14/95:56 p.m.
DEN
-
YTZ
1 stop18h 29m
Multiple Airlines
Deal found 28/7C$ 544
Thu 27/84:00 p.m.
YQG
-
DEN
1 stop21h 20m
WestJet
Wed 2/912:15 p.m.
DEN
-
YQG
1 stop24h 55m
WestJet
Deal found 28/7C$ 544
Wed 26/86:00 a.m.
YYZ
-
DEN
2 stops13h 10m
Multiple Airlines
Wed 26/88:26 p.m.
DEN
-
YYZ
1 stop22h 24m
Multiple Airlines
Deal found 30/7C$ 544
Tue 15/912:55 p.m.
YYZ
-
DEN
1 stop10h 54m
Multiple Airlines
Tue 22/910:50 p.m.
DEN
-
YYZ
1 stop19h 19m
Multiple Airlines
Deal found 1/8C$ 545
Tue 18/88:00 a.m.
YYZ
-
DEN
1 stop29h 20m
WestJet
Mon 24/812:15 p.m.
DEN
-
YYZ
1 stop9h 55m
WestJet
Deal found 28/7C$ 546
Tue 15/98:45 a.m.
YYZ
-
DEN
Nonstop3h 37m
Air Canada
Tue 22/911:35 a.m.
DEN
-
YYZ
Nonstop3h 10m
Air Canada
Deal found 1/8C$ 548
Sat 22/88:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Sat 29/812:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 1/8C$ 549

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 2 August 2026.

Round-trip from

C$ 502

One-way from

C$ 230

Popular in

February

Cheapest in

November

Average price

C$ 675

Good round-trip deal

C$ 668 or less

Good one-way deal

C$ 441 or less
United Airlines
  • United Airlines
  • 4/9-6/9
  • 1 total stop
  • 33h 02m total
  • Ontario to Denver
Search Deals
12/9
  • 12/9
  • 1 total stop
  • 8h 26m total
  • Ontario to Denver
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (C$ 26 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 2 August 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

WindsorDenver

YQG - DEN

YQGDEN

Windsor

Thu 27/8

4:00 p.m.-11:20 a.m.

1 stop21h 20m

Denver Intl

Wed 2/9

12:15 p.m.-3:10 p.m.

1 stop24h 55m

C$ 544

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Tue 18/8

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

1 stop16h 40m

Denver Intl

Mon 24/8

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

1 stop29h 35m

C$ 555

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Fri 21/8

1:45 p.m.-4:45 p.m.

1 stop29h 00m

Denver Intl

Fri 28/8

11:59 p.m.-12:55 p.m.

2 stops34h 56m

C$ 570

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 29/8

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

2 stops19h 05m

Denver Intl

Tue 1/9

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

2 stops22h 15m

C$ 572

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Thu 27/8

8:55 a.m.-4:45 p.m.

1 stop9h 50m

Denver Intl

Fri 4/9

4:28 p.m.-5:20 p.m.

1 stop22h 52m

C$ 587

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Tue 18/8

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

1 stop16h 40m

Denver Intl

Wed 26/8

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

1 stop29h 35m

C$ 608

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Thu 3/9

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

1 stop19h 10m

Denver Intl

Mon 7/9

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

1 stop27h 00m

C$ 608

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sat 10/10

9:40 a.m.-5:08 p.m.

1 stop9h 28m

Denver Intl

Tue 13/10

6:10 a.m.-5:19 p.m.

1 stop9h 09m

C$ 615

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sat 12/9

12:08 p.m.-5:21 p.m.

1 stop7h 13m

Denver Intl

Wed 23/9

6:00 a.m.-5:18 p.m.

1 stop9h 18m

C$ 615

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Wed 19/8

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

1 stop19h 10m

Denver Intl

Wed 26/8

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

1 stop27h 00m

C$ 632

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/7

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

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

Currently, September is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of C$ 593). Flying from Region of Ontario to Denver in January is currently the most expensive (average of C$ 934). 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 2 August 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 2 August 2026.

The most flights from CAON to DEN are scheduled on a Wednesday (9 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (7 on average).

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

Airfare is below average for this route at the moment.
Region of Ontario to Denver flights typically cost between C$ 581 and C$ 792 in August.
The cheapest round-trip price found within the last 5 days was C$ 539 on Multiple Airlines (25 Aug-3 Sep).

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 45 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.

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 8h 25m. WestJet provides one of the quickest options available for as low as C$ 667. Airlines will cover a distance of 2128 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: Air Canada (66%), United Airlines (66%), Brussels Airlines( 49%).

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

    On average you can expect to pay C$ 1,611 for a flight from Region of Ontario to Denver. The cheapest flight overall is C$ 307 while the most popular route, (Toronto Pearson Intl - Denver Intl) is currently priced at C$ 436.

  • 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, September is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of C$ 593). Flying from Region of Ontario to Denver in January is currently the most expensive (average of C$ 934). 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
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 2 August 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 309AverageC$ 653FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 401AverageC$ 706FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 409AverageC$ 455FlexibilityNo 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 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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