Denver

$149+ 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 7/25. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
Apr 2 — Apr 91
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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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$225
(oojo)

One-way from

$149
(oojo)

Popular in

December

Cheapest in

October

Average price

$485

Good round-trip deal

$352 or less

Good one-way deal

$200 or less
Provider with most accurate pricing for Toronto (YTO)-Denver Intl flight deals.
Provider most trusted by Cheapflights users for Toronto (YTO)-Denver Intl flights.
From Ontario to Denver Intl
One-way flight from Ontario to Denver Intl
Highest demand for flights based on searches. 1% potential increase in price ($6 potential increase over avg. RT price).
Cheapest flight prices on average. 0% potential price decrease ($5 potential savings vs. average RT price).
Average for round-trip flights in March 2025
Price to beat on a round-trip flight from Ontario to Denver Intl.
Price to beat on a one-way flight from Ontario to Denver Intl.

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 March 28, 2025.

This oojo deal was found by Cheapflights users on 3/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/16:10 amYOW - DEN
2 stops14h 42mWestJet
Sun 6/87:40 pmDEN - YOW
1 stop9h 05mWestJet
Deal found 3/27$225
This oojo deal was found by Cheapflights users on 3/26. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/256:00 amYHM - DEN
1 stop14h 52mWestJet
Wed 5/2812:15 pmDEN - YHM
1 stop10h 26mWestJet
Deal found 3/26$267
This Trip.com deal was found by Cheapflights users on 3/27. 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.
Mon 4/286:10 pmYOW - DEN
1 stop16h 51mMultiple Airlines
Wed 5/712:15 pmDEN - YOW
1 stop10h 26mMultiple Airlines
Deal found 3/27$291
This Mytrip deal was found by Cheapflights users on 3/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/116:20 pmYYZ - DEN
Nonstop3h 45mMultiple Airlines
Sun 5/1812:15 pmDEN - YYZ
1 stop8h 39mMultiple Airlines
Deal found 3/27$352
This FlightHub deal was found by Cheapflights users on 3/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/118:00 amYYZ - DEN
1 stop29h 24mWestJet
Mon 9/1512:15 pmDEN - YYZ
1 stop8h 37mWestJet
Deal found 3/27$353
This Kiwi.com deal was found by Cheapflights users on 3/27. 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.
Mon 4/284:10 pmYTZ - DEN
2 stops13h 46mMultiple Airlines
Thu 5/13:42 pmDEN - YTZ
1 stop18h 40mMultiple Airlines
Deal found 3/27$375
This Mytrip deal was found by Cheapflights users on 3/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1011:00 amYUL - DEN
3 stops26h 27mMultiple Airlines
Sat 5/1712:15 pmDEN - YUL
3 stops34h 22mMultiple Airlines
Deal found 3/26$394
This CheapTicketsDeal deal was found by Cheapflights users on 3/26. 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 CheapTicketsDeal is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/297:00 amYUL - DEN
1 stop30h 27mWestJet
Sun 6/112:15 pmDEN - YUL
1 stop10h 28mWestJet
Deal found 3/26$395
This Air Canada deal was found by Cheapflights users on 3/25. 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.
Fri 5/98:05 amYUL - DEN
Nonstop4h 22mAir Canada
Mon 5/125:40 pmDEN - YUL
Nonstop3h 46mAir Canada
Deal found 3/25$402
This American Airlines deal was found by Cheapflights users on 3/26. 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.
Wed 6/257:29 amYUL - DEN
1 stop9h 36mAmerican Airlines
Tue 7/15:00 amDEN - YUL
1 stop7h 50mAmerican Airlines
Deal found 3/26$403
This Booking.com deal was found by Cheapflights users on 3/27. 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.
Thu 4/178:35 amYYZ - DEN
Nonstop3h 45mAir Canada
Wed 4/2311:15 amDEN - YYZ
Nonstop3h 11mAir Canada
Deal found 3/27$413
This Mytrip deal was found by Cheapflights users on 3/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/259:25 amYKF - DEN
2 stops28h 02mMultiple Airlines
Wed 5/2812:15 pmDEN - YKF
2 stops29h 10mMultiple Airlines
Deal found 3/26$417

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 March 28, 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

Sun 6/1

6:10 am-6:52 pm

2 stops14h 42m

Denver Intl

Sun 6/8

7:40 pm-6:45 am

1 stop9h 05m

$225

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Sun 5/25

6:00 am-6:52 pm

1 stop14h 52m

Denver Intl

Wed 5/28

12:15 pm-12:41 am

1 stop10h 26m

$267

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 4/28

6:10 pm-9:01 am

1 stop16h 51m

Denver Intl

Wed 5/7

12:15 pm-12:41 am

1 stop10h 26m

$291

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 5/11

6:20 pm-8:05 pm

Nonstop3h 45m

Denver Intl

Sun 5/18

12:15 pm-10:54 pm

1 stop8h 39m

$352

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 9/11

8:00 am-11:24 am

1 stop29h 24m

Denver Intl

Mon 9/15

12:15 pm-10:52 pm

1 stop8h 37m

$353

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Mon 4/28

4:10 pm-3:56 am

2 stops13h 46m

Denver Intl

Thu 5/1

3:42 pm-12:22 pm

1 stop18h 40m

$375

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sat 5/10

11:00 am-11:27 am

3 stops26h 27m

Denver Intl

Sat 5/17

12:15 pm-12:37 am

3 stops34h 22m

$394

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Thu 5/29

7:00 am-11:27 am

1 stop30h 27m

Denver Intl

Sun 6/1

12:15 pm-12:43 am

1 stop10h 28m

$395

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Fri 5/9

8:05 am-10:27 am

Nonstop4h 22m

Denver Intl

Fri 5/16

5:40 pm-11:26 pm

Nonstop3h 46m

$402

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Wed 6/25

7:29 am-3:05 pm

1 stop9h 36m

Denver Intl

Tue 7/1

5:00 am-2:50 pm

1 stop7h 50m

$403

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 39 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, 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 March 28, 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.

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 March 28, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta and Hawaiian Airlines from Ontario to Denver. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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
8.0
Very good

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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?

    $149 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Air Canada and American Airlines, with prices starting from $217 and $231, respectively.

  • What are the most popular routes 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 (60%), United Airlines (60%) and Austrian Airlines (51%).

  • 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 $354, our data indicates the cheapest price to be $166. The most popular route (Toronto Pearson Intl - Denver Intl), is priced around $233.

  • 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
Lakewood
Black Hawk
Winter Park
Broomfield
Cripple Creek
Silverthorne
Golden
Brighton
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Grand Lake
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Copper Mountain
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Limon
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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 2,558,603 searches. Data last updated March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$234Average$468FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$254Average$483FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$429Average$517FlexibilityNo cancel feeOn-time71%
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