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Cheap flights from Ontario to Denver from C$ 226

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 25/8. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
4 Aug — 11 Aug1
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 30 July 2025.

Round-trip from

C$ 403

One-way from

C$ 226

Popular in

February

Cheapest in

August

Average price

C$ 622

Good round-trip deal

C$ 664 or less

Good one-way deal

C$ 346 or less
WestJet
  • WestJet
  • 7/9-16/9
  • 3 total stops
  • 25h 18m total
  • Ontario to Denver
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25/8
  • 25/8
  • 2 total stops
  • 20h 00m total
  • Ontario to Denver
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Highest demand for flights based on searches. 6% potential increase in price (C$ 54 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 11 potential savings vs. average RT price).
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Average for round-trip flights in July 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 30 July 2025.

Sun 7/95:55 a.m.YOW - DEN
2 stops14h 53mWestJet
Thu 18/912:15 p.m.DEN - YOW
1 stop10h 25mWestJet
Deal found 27/7C$ 394
Fri 22/85:30 p.m.YUL - DEN
1 stop19h 57mWestJet
Wed 27/812:15 p.m.DEN - YUL
1 stop10h 28mWestJet
Deal found 28/7C$ 422
Sat 6/99:35 a.m.YOW - DEN
1 stop11h 48mAir Canada
Sat 20/97:05 p.m.DEN - YOW
1 stop11h 18mAir Canada
Deal found 27/7C$ 425
Wed 10/97:30 a.m.YUL - DEN
1 stop11h 03mAir Canada
Mon 15/97:05 p.m.DEN - YUL
1 stop9h 55mAir Canada
Deal found 29/7C$ 429
Thu 11/96:00 a.m.YHM - DEN
1 stop31h 24mWestJet
Thu 18/912:15 p.m.DEN - YHM
1 stop10h 25mWestJet
Deal found 28/7C$ 430
Tue 2/912:30 p.m.YOW - DEN
1 stop8h 18mUnited Airlines
Tue 16/96:00 a.m.DEN - YOW
1 stop6h 04mUnited Airlines
Deal found 27/7C$ 433
Sat 27/96:00 a.m.YHM - DEN
1 stop31h 24mMultiple Airlines
Sun 5/1012:15 p.m.DEN - YHM
1 stop31h 04mMultiple Airlines
Deal found 29/7C$ 435
Thu 21/812:25 p.m.YTZ - DEN
1 stop7h 55mAir Canada
Thu 28/85:40 p.m.DEN - YTZ
1 stop12h 26mAir Canada
Deal found 29/7C$ 437
Wed 17/99:40 p.m.YYZ - DEN
1 stop15h 44mMultiple Airlines
Tue 23/912:15 p.m.DEN - YYZ
1 stop8h 37mMultiple Airlines
Deal found 28/7C$ 437
Fri 29/811:40 a.m.YYZ - DEN
1 stop9h 50mAir Canada
Tue 2/97:45 a.m.DEN - YYZ
Nonstop3h 05mAir Canada
Deal found 28/7C$ 440
Sat 20/910:35 p.m.YYZ - DEN
2 stops14h 49mWestJet
Mon 22/912:15 p.m.DEN - YYZ
2 stops10h 16mWestJet
Deal found 29/7C$ 444
Fri 5/97:50 a.m.YTZ - DEN
1 stop12h 36mMultiple Airlines
Mon 8/912:28 p.m.DEN - YTZ
1 stop5h 34mMultiple Airlines
Deal found 29/7C$ 446

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 30 July 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 7/9

5:55 a.m.-6:48 p.m.

2 stops14h 53m

Denver Intl

Thu 18/9

12:15 p.m.-12:40 a.m.

1 stop10h 25m

C$ 394

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Fri 22/8

5:30 p.m.-11:27 a.m.

1 stop19h 57m

Denver Intl

Wed 27/8

12:15 p.m.-12:43 a.m.

1 stop10h 28m

C$ 422

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 6/9

9:35 a.m.-7:23 p.m.

1 stop11h 48m

Denver Intl

Sun 14/9

7:05 p.m.-8:23 a.m.

1 stop11h 18m

C$ 425

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Thu 11/9

6:00 a.m.-11:24 a.m.

1 stop31h 24m

Denver Intl

Thu 18/9

12:15 p.m.-12:40 a.m.

1 stop10h 25m

C$ 430

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sat 13/9

6:00 a.m.-10:14 a.m.

1 stop6h 14m

Denver Intl

Sat 20/9

9:40 a.m.-3:26 p.m.

Nonstop3h 46m

C$ 432

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 2/9

12:30 p.m.-6:48 p.m.

1 stop8h 18m

Denver Intl

Tue 16/9

6:00 a.m.-2:04 p.m.

1 stop6h 04m

C$ 433

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Sat 27/9

6:00 a.m.-11:24 a.m.

1 stop31h 24m

Denver Intl

Sun 5/10

12:15 p.m.-9:19 p.m.

1 stop31h 04m

C$ 435

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 17/9

9:40 p.m.-11:24 a.m.

1 stop15h 44m

Denver Intl

Tue 23/9

12:15 p.m.-10:52 p.m.

1 stop8h 37m

C$ 437

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Thu 21/8

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

1 stop7h 55m

Denver Intl

Thu 28/8

5:40 p.m.-8:06 a.m.

1 stop12h 26m

C$ 437

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Fri 29/8

11:40 a.m.-7:30 p.m.

1 stop9h 50m

Denver Intl

Tue 2/9

7:45 a.m.-12:50 p.m.

Nonstop3h 05m

C$ 440

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/7

Showing 1-10 of 43 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 30 July 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 30 July 2025.

The most flights from CAON to DEN are scheduled on a Monday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (8 on average).

How much does it cost to fly round-trip from Region of Ontario to Denver?

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 30 July 2025.
Get a feel of what it's like to fly with Delta,United Airlines, andAmerican Airlines from Ontario to Denver by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,980 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,980 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,980 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
WestJet
7.2
Good
2,975 reviews
Delta
8.0
Very good
7,980 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air Canada
7.1
Good
9,837 reviews
Delta
8.0
Very good
7,980 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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 Air Canada. According to our data, you can fly for as low as C$ 236. Users have also found prices from C$ 254 and C$ 255 on WestJet and American Airlines, 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 Ottawa - 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 (60%), United Airlines (60%), Brussels Airlines( 31%).

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

    On average you can expect to pay C$ 2,048 for a flight from Region of Ontario to Denver. The cheapest flight overall is C$ 229 while the most popular route, (Toronto Pearson Intl - Denver Intl) is currently priced at C$ 383.

  • 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 Denver?

Book flights to Denver 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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Pearson Intl to Denver flights
Pierre Elliott Trudeau Intl to Denver flights
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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 30 July 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapestC$ 211AverageC$ 340FlexibilityNo cancel feeOn-time62%
Search Frontier flights
WestJetCheapestC$ 244AverageC$ 422FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 365AverageC$ 703FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 378AverageC$ 682FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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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