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Cheap flights from Ontario to Denver from C$ 208

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 16/8. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
17 Jun — 24 Jun1
1 adult

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 12 June 2025.

Round-trip from

C$ 350

One-way from

C$ 208

Popular in

December

Cheapest in

September

Average price

C$ 602

Good round-trip deal

C$ 559 or less

Good one-way deal

C$ 281 or less
WestJet
  • WestJet
  • 9/8-11/8
  • 2 total stops
  • 28h 38m total
  • Ontario to Denver
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WestJet
  • WestJet
  • 16/8
  • 1 total stop
  • 19h 57m total
  • Ontario to Denver
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 34 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 12 potential savings vs. average RT price).
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Average for round-trip flights in June 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 12 June 2025.

Sat 9/87:15 p.m.YOW - DEN
1 stop18h 12mWestJet
Mon 11/812:15 p.m.DEN - YOW
1 stop10h 26mWestJet
Deal found 12/6C$ 350
Sat 5/75:50 p.m.YOW - DEN
1 stop7h 39mUnited Airlines
Sat 12/711:54 p.m.DEN - YOW
1 stop7h 17mUnited Airlines
Deal found 10/6C$ 365
Fri 8/87:00 p.m.YYZ - DEN
2 stops18h 27mWestJet
Mon 11/812:15 p.m.DEN - YYZ
1 stop8h 39mWestJet
Deal found 9/6C$ 375
Tue 8/72:48 p.m.YOW - DEN
1 stop8h 29mLufthansa
Tue 15/75:59 p.m.DEN - YOW
2 stops13h 12mLufthansa
Deal found 10/6C$ 392
Fri 1/810:00 a.m.YYZ - DEN
2 stops15h 21mMultiple Airlines
Sun 3/812:15 p.m.DEN - YYZ
1 stop10h 09mMultiple Airlines
Deal found 12/6C$ 414
Thu 4/97:45 p.m.YKF - DEN
1 stop17h 39mWestJet
Mon 8/912:15 p.m.DEN - YKF
1 stop28h 40mWestJet
Deal found 10/6C$ 417
Sun 24/86:00 a.m.YOW - DEN
1 stop6h 21mAir Canada
Thu 28/87:45 a.m.DEN - YOW
1 stop7h 20mAir Canada
Deal found 10/6C$ 422
Wed 18/68:40 a.m.YYZ - DEN
Nonstop3h 40mAir Canada
Sat 21/67:45 a.m.DEN - YYZ
Nonstop3h 13mAir Canada
Deal found 11/6C$ 428
Fri 8/84:00 p.m.YQG - DEN
1 stop6h 00mAir Canada
Mon 11/87:45 a.m.DEN - YQG
1 stop5h 37mAir Canada
Deal found 11/6C$ 442
Fri 13/61:25 p.m.YYZ - DEN
1 stop10h 53mAmerican Airlines
Tue 17/67:00 a.m.DEN - YYZ
1 stop5h 55mAmerican Airlines
Deal found 10/6C$ 462
Fri 13/62:27 p.m.YYZ - DEN
1 stop8h 08mDelta
Tue 17/612:55 a.m.DEN - YYZ
1 stop6h 26mDelta
Deal found 10/6C$ 463
Tue 15/712:25 p.m.YTZ - DEN
1 stop7h 55mAir Canada
Fri 18/79:40 a.m.DEN - YTZ
1 stop8h 06mAir Canada
Deal found 10/6C$ 465

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 12 June 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

Sat 9/8

7:15 p.m.-11:27 a.m.

1 stop18h 12m

Denver Intl

Mon 11/8

12:15 p.m.-12:41 a.m.

1 stop10h 26m

C$ 350

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 5/7

5:50 p.m.-11:29 p.m.

1 stop7h 39m

Denver Intl

Sat 12/7

11:54 p.m.-9:11 a.m.

1 stop7h 17m

C$ 365

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Fri 8/8

7:00 p.m.-11:27 a.m.

2 stops18h 27m

Denver Intl

Mon 11/8

12:15 p.m.-10:54 p.m.

1 stop8h 39m

C$ 375

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 8/7

2:48 p.m.-9:17 p.m.

1 stop8h 29m

Denver Intl

Tue 15/7

5:59 p.m.-9:11 a.m.

2 stops13h 12m

C$ 392

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Fri 1/8

10:00 a.m.-11:21 p.m.

2 stops15h 21m

Denver Intl

Sun 3/8

12:15 p.m.-12:24 a.m.

1 stop10h 09m

C$ 414

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Thu 4/9

7:45 p.m.-11:24 a.m.

1 stop17h 39m

Denver Intl

Mon 8/9

12:15 p.m.-6:55 p.m.

1 stop28h 40m

C$ 417

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sun 24/8

6:00 a.m.-10:21 a.m.

1 stop6h 21m

Denver Intl

Thu 28/8

7:45 a.m.-5:05 p.m.

1 stop7h 20m

C$ 422

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 16/7

8:40 a.m.-10:20 a.m.

Nonstop3h 40m

Denver Intl

Tue 22/7

7:45 a.m.-12:58 p.m.

Nonstop3h 13m

C$ 438

WindsorDenver

YQG - DEN

YQGDEN

Windsor

Fri 8/8

4:00 p.m.-8:00 p.m.

1 stop6h 00m

Denver Intl

Mon 11/8

7:45 a.m.-3:22 p.m.

1 stop5h 37m

C$ 442

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Tue 15/7

12:25 p.m.-6:20 p.m.

1 stop7h 55m

Denver Intl

Fri 18/7

9:40 a.m.-7:46 p.m.

1 stop8h 06m

C$ 465

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 50 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, August is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of C$ 320). Flying from Region of Ontario to Denver in December is currently the most expensive (average of C$ 484). 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 12 June 2025.

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 12 June 2025.

The most flights from CAON to DEN are scheduled on a Monday (10 on average). You will have fewer flight options on Friday, 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 13.0 - 58.0 mm per month. May is typically the wettest month, when rainfall can reach 58.0 mm. January is typically the driest time to visit Denver when rainfall is around 13.0 mm.

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 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -1.0 C).

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 12 June 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta and Brussels Airlines from Ontario to Denver to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Brussels Airlines
7.4
Good
355 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

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

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as C$ 208. Users have also found prices from C$ 220 and C$ 223 on United Airlines and Air Canada, respectively.

  • 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 (79%), United Airlines (79%), Austrian Airlines( 76%).

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

    On average you can expect to pay C$ 1,663 for a flight from Region of Ontario to Denver. The cheapest flight overall is C$ 192 while the most popular route, (Toronto Pearson Intl - Denver Intl) is currently priced at C$ 395.

  • 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, August is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of C$ 320). Flying from Region of Ontario to Denver in December is currently the most expensive (average of C$ 484). 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 Ontario?

Book flights to Ontario if you plan to visit one of these locations
Golden
Westminster
Thornton

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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 4 airlines flying from Ontario to Denver

Discover the top 4 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 12 June 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapestC$ 209AverageC$ 337FlexibilityNo cancel feeOn-time62%
Search Frontier flights
WestJetCheapestC$ 239AverageC$ 382FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 361AverageC$ 678FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 381AverageC$ 694FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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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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