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$132+ Cheap flights from Ontario to Denver (DEN)

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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
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Cheap 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 December 23, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:15 pmYYZ - DEN
1 stop12h 08mMultiple Airlines
Tue 2/1010:29 pmDEN - YYZ
2 stops19h 07mMultiple Airlines
Deal found 12/22$414
This Kiwi.com deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:00 amYTZ - DEN
2 stops20h 23mMultiple Airlines
Tue 2/104:38 pmDEN - YTZ
1 stop18h 32mMultiple Airlines
Deal found 12/22$501
This Kiwi.com deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:20 pmYYZ - DEN
2 stops43h 55mMultiple Airlines
Tue 1/66:10 amDEN - YYZ
1 stop11h 25mMultiple Airlines
Deal found 12/22$557
This United Airlines deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:55 pmYYZ - DEN
1 stop15h 00mUnited Airlines
Tue 2/101:25 pmDEN - YYZ
Nonstop3h 10mUnited Airlines
Deal found 12/22$601
This Kiwi.com deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:15 amYUL - DEN
2 stops17h 08mMultiple Airlines
Sat 1/1011:22 amDEN - YUL
1 stop11h 08mMultiple Airlines
Deal found 12/21$609
This Kiwi.com deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:10 amYYZ - DEN
2 stops26h 23mMultiple Airlines
Sat 1/1011:24 amDEN - YYZ
1 stop22h 11mMultiple Airlines
Deal found 12/21$638
This Kiwi.com deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:15 amYUL - DEN
2 stops17h 08mMultiple Airlines
Wed 1/710:36 amDEN - YUL
1 stop11h 54mMultiple Airlines
Deal found 12/21$664
This Kiwi.com deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/302:35 pmYYZ - DEN
2 stops32h 40mMultiple Airlines
Sat 1/36:15 amDEN - YYZ
1 stop11h 37mMultiple Airlines
Deal found 12/21$711
This Kiwi.com deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:15 amYUL - DEN
2 stops17h 08mMultiple Airlines
Mon 1/1212:05 amDEN - YUL
1 stop11h 27mMultiple Airlines
Deal found 12/21$719
This Kiwi.com deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:15 amYUL - DEN
2 stops17h 08mMultiple Airlines
Fri 1/910:57 amDEN - YUL
1 stop10h 15mMultiple Airlines
Deal found 12/21$727
This United Airlines deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:25 pmYUL - DEN
Nonstop4h 30mUnited Airlines
Sun 1/1111:15 amDEN - YUL
Nonstop3h 43mUnited Airlines
Deal found 12/21$730
This United Airlines deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:35 amYYZ - DEN
1 stop12h 18mUnited Airlines
Sat 1/105:41 pmDEN - YYZ
1 stop12h 07mUnited Airlines
Deal found 12/21$730

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 December 23, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$333
(Kiwi.com)

One-way from

$132
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$513

Good round-trip deal

$472 or less

Good one-way deal

$282 or less
Provider with most accurate pricing for Toronto (YTO)-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Toronto (YTO)-Denver Intl flights.
Search Deals
From Ontario to Denver Intl
Search Deals
One-way flight from Ontario to Denver Intl
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($1 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 2,558,603 searches. Data last updated December 23, 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

Thu 2/5

9:40 am-8:00 pm

1 stop12h 20m

Denver Intl

Thu 2/12

7:00 am-5:25 pm

2 stops32h 25m

$356

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Thu 1/22

9:20 am-9:41 pm

1 stop14h 21m

Denver Intl

Fri 1/23

9:00 pm-1:20 pm

2 stops14h 20m

$367

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Tue 2/17

4:45 pm-10:42 am

2 stops19h 57m

Denver Intl

Wed 2/18

1:10 pm-3:35 pm

2 stops24h 25m

$374

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 2/4

4:45 pm-11:58 pm

2 stops33h 13m

Denver Intl

Sat 2/14

11:38 am-3:35 pm

2 stops25h 57m

$378

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Fri 1/9

3:00 pm-1:23 am

1 stop12h 23m

Denver Intl

Sun 1/25

7:10 am-6:57 pm

1 stop9h 47m

$381

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sat 2/7

4:45 pm-12:38 pm

1 stop21h 53m

Denver Intl

Fri 2/13

7:52 pm-3:35 pm

1 stop17h 43m

$381

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 1/18

8:30 am-10:23 am

Nonstop3h 53m

Denver Intl

Fri 1/23

1:25 pm-6:35 pm

Nonstop3h 10m

$383

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Sun 1/18

1:30 pm-9:49 pm

2 stops10h 19m

Denver Intl

Sun 1/25

7:10 am-6:57 pm

1 stop9h 47m

$383

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Wed 2/25

12:30 pm-7:55 pm

1 stop9h 25m

Denver Intl

Fri 2/27

11:15 am-9:35 pm

1 stop8h 20m

$384

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 1/29

4:45 pm-10:53 am

2 stops20h 08m

Denver Intl

Mon 2/2

5:09 pm-3:35 pm

1 stop20h 26m

$387

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

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, December is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of $216). Flying from Region of Ontario to Denver in May is currently the most expensive (average of $295). 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 December 23, 2025.

One of the essential ways to save on airfare from Region of Ontario to Denver is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 32% on airfare.

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 December 23, 2025.

The most flights from CAON to DEN are scheduled on a Sunday (9 on average). You will have fewer flight options on Tuesday, 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?

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?

    For a flight from Ontario to Denver, you will be flying into Denver Intl. Denver Intl (DEN) is just 18.5 mi from the center of the city.

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

    For as low as $383, Alaska Airlines can have you in Denver from Region of Ontario in 3h 53m. The distance between Region of Ontario and Denver is about 1312 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    While some choose either Montreal Pierre Elliott Trudeau Intl - Denver Intl or Toronto Island - Denver Intl, Toronto Pearson Intl - Denver Intl is the most popular route from Region of Ontario to Denver.

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

    The top 3 most reliable airlines when flying from Region of Ontario to Denver are United Airlines (77%), Air Canada (76%) and Brussels Airlines (75%).

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

    Looking for the cheapest flight from Region of Ontario to Denver? While on average our users pay $1,051, our data indicates the cheapest price to be $250. The most popular route (Toronto Pearson Intl - Denver Intl), is priced around $231.

  • 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, December is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of $216). Flying from Region of Ontario to Denver in May is currently the most expensive (average of $295). 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

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Thornton
Black Hawk
Broomfield
Westminster
Winter Park
Golden
Greeley
Lone Tree
Lakewood
Wheat Ridge
Cripple Creek
Silverthorne
Central City
Frisco
Manitou Springs
Fort Morgan
Brighton
Longmont
Idaho Springs
Evergreen

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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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Top 2 airlines flying from Ontario to Denver

Discover the top 2 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 2,558,603 searches. Data last updated December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$251Average$530FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$267Average$524FlexibilityNo cancel feeOn-time67%

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