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$112+ 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 4/2. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
feb. 25 — mar. 41
mar. 2/25
mar. 3/4
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 febrero 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$279
(Kiwi.com)

One-way from

$112
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$507

Good round-trip deal

$317 or less

Good one-way deal

$233 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. 1% potential increase in price ($8 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in February 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 febrero 20, 2025.

This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
mar. 4/12:50 pmYOW - DEN
2 stops15h 06mMultiple Airlines
mar. 4/1510:44 pmDEN - YOW
1 stop16h 01mMultiple Airlines
Deal found 2/20$279
This Air Canada deal was found by Cheapflights users on 2/20. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 5/216:00 amYOW - DEN
1 stop6h 27mAir Canada
lun. 6/27:48 pmDEN - YOW
1 stop10h 35mAir Canada
Deal found 2/20$285
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
jue. 3/208:00 pmYYZ - DEN
1 stop9h 56mMultiple Airlines
jue. 3/277:39 pmDEN - YYZ
1 stop8h 16mMultiple Airlines
Deal found 2/20$291
This Kiwi.com deal was found by Cheapflights users on 2/19. 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.
vie. 3/143:50 pmYTZ - DEN
1 stop18h 42mMultiple Airlines
sáb. 3/2910:44 pmDEN - YTZ
2 stops18h 09mMultiple Airlines
Deal found 2/19$329
This United Airlines deal was found by Cheapflights users on 2/20. 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.
mar. 4/15:15 amYOW - DEN
1 stop8h 54mUnited Airlines
mié. 4/91:25 pmDEN - YOW
1 stop6h 10mUnited Airlines
Deal found 2/20$329
This Air Canada deal was found by Cheapflights users on 2/20. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/2612:15 pmYYZ - DEN
1 stop7h 44mAir Canada
sáb. 5/1011:25 amDEN - YYZ
Nonstop3h 10mAir Canada
Deal found 2/20$370
This Air Canada deal was found by Cheapflights users on 2/19. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 5/1412:25 pmYTZ - DEN
1 stop7h 55mAir Canada
sáb. 5/177:35 pmDEN - YTZ
2 stops17h 15mAir Canada
Deal found 2/19$396
This Trip.com deal was found by Cheapflights users on 2/20. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/226:00 amYHM - DEN
1 stop14h 52mWestJet
lun. 5/2612:15 pmDEN - YHM
1 stop10h 26mWestJet
Deal found 2/20$400
This Booking.com deal was found by Cheapflights users on 2/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 5/217:00 amYUL - DEN
1 stop30h 27mWestJet
dom. 5/257:40 pmDEN - YUL
1 stop27h 03mWestJet
Deal found 2/20$409
This American Airlines deal was found by Cheapflights users on 2/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/267:29 amYUL - DEN
2 stops12h 11mAmerican Airlines
dom. 5/45:00 amDEN - YUL
1 stop7h 55mAmerican Airlines
Deal found 2/19$411
This United Airlines deal was found by Cheapflights users on 2/19. 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.
vie. 3/144:10 pmYYZ - DEN
Nonstop4h 05mUnited Airlines
sáb. 3/295:40 pmDEN - YYZ
Nonstop3h 12mUnited Airlines
Deal found 2/19$421
This Kissandfly.com deal was found by Cheapflights users on 2/20. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 3/173:45 pmYUL - DEN
1 stop10h 14mBritish Airways
lun. 3/2412:46 pmDEN - YUL
2 stops7h 59mBritish Airways
Deal found 2/20$422

Find flights from Ontario to Denver within your budget

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 febrero 20, 2025.

Fly from

Ontario

Fly to

Denver

Route

Depart

Return

Price

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

mar. 4/1

2:50 pm-3:56 am

2 stops15h 06m

Denver Intl

mar. 4/15

10:44 pm-4:45 pm

1 stop16h 01m

$279

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

mié. 5/21

6:00 am-10:27 am

1 stop6h 27m

Denver Intl

lun. 6/2

7:48 pm-8:23 am

1 stop10h 35m

$285

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

jue. 3/20

8:00 pm-3:56 am

1 stop9h 56m

Denver Intl

jue. 3/27

7:39 pm-5:55 am

1 stop8h 16m

$291

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

mar. 4/1

5:15 am-12:09 pm

1 stop8h 54m

Denver Intl

mié. 4/9

1:25 pm-9:35 pm

1 stop6h 10m

$329

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

vie. 3/14

3:50 pm-8:32 am

1 stop18h 42m

Denver Intl

sáb. 3/29

10:44 pm-6:53 pm

2 stops18h 09m

$329

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

sáb. 4/26

12:15 pm-5:59 pm

1 stop7h 44m

Denver Intl

sáb. 5/10

11:25 am-4:35 pm

Nonstop3h 10m

$370

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

mié. 5/14

12:25 pm-6:20 pm

1 stop7h 55m

Denver Intl

sáb. 5/17

7:35 pm-2:50 pm

2 stops17h 15m

$396

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

jue. 5/22

6:00 am-6:52 pm

1 stop14h 52m

Denver Intl

lun. 5/26

12:15 pm-12:41 am

1 stop10h 26m

$400

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

mié. 5/21

7:00 am-11:27 am

1 stop30h 27m

Denver Intl

dom. 5/25

7:40 pm-12:43 am

1 stop27h 03m

$409

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

sáb. 4/26

7:29 am-5:40 pm

2 stops12h 11m

Denver Intl

dom. 5/4

5:00 am-2:55 pm

1 stop7h 55m

$411

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 47 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.

Travel insights for flights from Ontario to Denver

Get recent, data-driven insights about flights from Ontario to Denver including ideal travel times, pricing trends, and more.

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

Currently, October is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of $197). Flying from Region of Ontario to Denver in March is currently the most expensive (average of $278). 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 febrero 20, 2025.

When flying from Region of Ontario to Denver, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 febrero 20, 2025.

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

Rainfall in Denver by month

Plan your trip to Denver by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Denver ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Denver when rainfall is around 0.5 in.

Temperature in Denver by month

Plan your trip to Denver by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Denver, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Denver. Reviews last updated febrero 20, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta and Aeromexico from Ontario to Denver. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Alaska Airlines
8.0
Very good
9,697 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Delta
8.0
Very good
8,219 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Aeromexico
7.5
Good
1,771 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

United Airlines
7.4
Good
8,765 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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.

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

    $173 is the cheapest one-way deal found within the past few days, from Air Canada. You may also be able to find cheap deals on WestJet and American Airlines, with prices starting from $193 and $229, 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 Air Canada (62%), United Airlines (62%) and Austrian Airlines (59%).

  • 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 $910, our data indicates the cheapest price to be $169. The most popular route (Toronto Pearson Intl - Denver Intl), is priced around $187.

  • 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, October is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of $197). Flying from Region of Ontario to Denver in March is currently the most expensive (average of $278). 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 Ontario?

Book flights to Ontario if you plan to visit one of these locations
Westminster
Black Hawk
Winter Park
Lakewood
Broomfield
Silverthorne
Golden
Brighton
Keystone
Frisco
Wheat Ridge
Grand Lake
Idaho Springs
Greeley
Central City
Copper Mountain
Longmont
Thornton
Limon
Dillon

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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 febrero 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$234Average$472FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$254Average$486FlexibilityNo cancel feeOn-time67%
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