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$147+ 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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$337
(Kiwi.com)

One-way from

$147
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$475

Good round-trip deal

$424 or less

Good one-way deal

$265 or less
Provider with most accurate pricing for Toronto (YTO)-Denver Intl flight deals.
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Provider most trusted by Cheapflights users for Toronto (YTO)-Denver Intl flights.
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From Ontario to Denver Intl
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One-way flight from Ontario to Denver Intl
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Highest demand for flights based on searches. 3% potential increase in price ($15 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/28. 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 12/95:10 pmYUL - DEN
1 stop27h 59mMultiple Airlines
Mon 12/1511:59 pmDEN - YUL
2 stops17h 45mMultiple Airlines
Deal found 10/28$344
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Fri 12/127:55 pmYYZ - DEN
1 stop10h 03mMultiple Airlines
Wed 1/74:25 pmDEN - YYZ
1 stop13h 30mMultiple Airlines
Deal found 10/28$346
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 12/27:45 pmYYZ - DEN
1 stop25h 24mMultiple Airlines
Thu 12/411:59 pmDEN - YYZ
1 stop18h 01mMultiple Airlines
Deal found 10/30$348
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/94:45 pmYYZ - DEN
1 stop27h 18mAlaska Airlines
Tue 1/68:22 pmDEN - YYZ
1 stop17h 13mAlaska Airlines
Deal found 10/28$350
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Sun 12/148:00 pmYYZ - DEN
1 stop9h 58mMultiple Airlines
Tue 1/611:59 pmDEN - YYZ
1 stop9h 47mMultiple Airlines
Deal found 10/28$351
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Thu 12/119:35 amYYZ - DEN
1 stop12h 37mMultiple Airlines
Mon 1/58:45 pmDEN - YYZ
2 stops12h 35mMultiple Airlines
Deal found 10/28$352
This Ticket deal was found by Cheapflights users on 10/29. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/205:25 pmYUL - DEN
Nonstop4h 30mAir Canada
Wed 11/2611:15 amDEN - YUL
Nonstop3h 43mAir Canada
Deal found 10/29$353
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Thu 12/117:55 pmYYZ - DEN
1 stop10h 03mMultiple Airlines
Tue 1/611:59 pmDEN - YYZ
1 stop9h 47mMultiple Airlines
Deal found 10/28$353
This Flightnetwork deal was found by Cheapflights users on 10/30. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/201:00 pmYYZ - DEN
1 stop8h 55mAir Canada
Wed 11/2611:15 amDEN - YYZ
1 stop8h 29mAir Canada
Deal found 10/30$354
This Netflights deal was found by Cheapflights users on 10/30. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/208:30 amYYZ - DEN
Nonstop3h 53mAir Canada
Thu 11/271:25 pmDEN - YYZ
Nonstop3h 10mAir Canada
Deal found 10/30$357
This Kiwi.com deal was found by Cheapflights users on 10/30. 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.
Sun 11/94:00 pmYYZ - DEN
1 stop27h 44mMultiple Airlines
Sun 11/1611:15 pmDEN - YYZ
2 stops19h 52mMultiple Airlines
Deal found 10/30$358
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/94:45 pmYYZ - DEN
1 stop27h 18mAlaska Airlines
Fri 1/911:49 amDEN - YYZ
2 stops25h 46mAlaska Airlines
Deal found 10/28$360

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 October 30, 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

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Thu 11/20

7:30 am-5:44 pm

1 stop12h 14m

Denver Intl

Wed 11/26

8:45 am-11:09 pm

2 stops12h 24m

$353

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Thu 11/20

12:30 pm-7:55 pm

1 stop9h 25m

Denver Intl

Tue 11/25

11:15 am-9:35 pm

1 stop8h 20m

$367

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Thu 11/20

12:30 pm-7:55 pm

1 stop9h 25m

Denver Intl

Wed 11/26

11:15 am-9:35 pm

1 stop8h 20m

$383

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 12/10

4:45 pm-11:59 pm

2 stops33h 14m

Denver Intl

Tue 1/6

6:00 am-3:35 pm

2 stops31h 35m

$390

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 1/14

8:30 am-10:23 am

Nonstop3h 53m

Denver Intl

Thu 1/15

1:25 pm-6:35 pm

Nonstop3h 10m

$394

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 12/10

4:45 pm-11:59 pm

2 stops33h 14m

Denver Intl

Sat 1/10

8:04 am-3:35 pm

2 stops29h 31m

$398

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 11/27

4:10 pm-6:05 pm

Nonstop3h 55m

Denver Intl

Sun 11/30

11:50 pm-9:36 am

1 stop7h 46m

$410

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 11/20

4:10 pm-6:05 pm

Nonstop3h 55m

Denver Intl

Mon 11/24

8:30 pm-9:58 am

1 stop11h 28m

$410

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 11/20

4:10 pm-6:05 pm

Nonstop3h 55m

Denver Intl

Wed 11/26

9:53 am-3:02 pm

Nonstop3h 09m

$411

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Fri 12/5

4:10 pm-6:06 pm

Nonstop3h 56m

Denver Intl

Fri 12/12

4:05 pm-11:46 pm

1 stop5h 41m

$411

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

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, November is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of $200). 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 October 30, 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 28% on airfare.

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 $410, Air Canada can have you in Denver from Region of Ontario in 3h 55m. 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 cheapest airlines to fly from Region of Ontario to Denver one-way?

    $231 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Air Canada and WestJet, with prices starting from $263 and $384, respectively.

  • 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 (67%), Air Canada (65%) and Brussels Airlines (62%).

  • 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 $500, our data indicates the cheapest price to be $232. The most popular route (Toronto Pearson Intl - Denver Intl), is priced around $249.

  • 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, November is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of $200). 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
Black Hawk
Westminster
Broomfield
Lakewood
Golden
Winter Park
Greeley
Lone Tree
Cripple Creek
Thornton
Silverthorne
Central City
Manitou Springs
Fort Morgan
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker
Sterling

Browse thousands of different options on Cheapflights for your next trip

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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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$251Average$514FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$267Average$524FlexibilityNo cancel feeOn-time67%

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