YOW - DEN

C$ 230 Find Cheap Flights from Ottawa to Denver

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ottawa to Denver departing on 14/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Denver

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ottawa to Denver, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ottawa to Denver, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
C$ 331
Typical prices: C$ 521-C$ 922
WestJet
Wed 20/5Mon 25/5
YOW - DEN • 2 stops
Cheapest one-way flights
C$ 219
Typical prices: C$ 501-C$ 826
WestJet
Thu 14/5
YOW - DEN • 2 stops
When to book
5 weeks
in advance
Our data shows that travellers who book at least 5 weeks in advance save around 49% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
September
Cheapest • 36% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Denver!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ottawa to Denver (YOW-DEN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ottawa to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ottawa to Denver

Wed, 20 May - Mon, 25 May
WestJet Logo
5:15 p.m. - 11:25 a.m.
YOW
-
DEN
20h 10m2 stops
WestJet Logo
12:15 p.m. - 12:40 a.m.
DEN
-
YOW
10h 25m1 stop
C$ 331WestJet
Wed, 20 May - Mon, 25 May
WestJet Logo
3:45 p.m. - 11:25 a.m.
YOW
-
DEN
21h 40m1 stop
WestJet Logo
12:15 p.m. - 12:40 a.m.
DEN
-
YOW
10h 25m1 stop
C$ 338WestJet
Tue, 27 Jan - Mon, 2 Feb
Multiple Airlines Logo
7:00 a.m. - 12:03 p.m.
YOW
-
DEN
31h 03m2 stops
Multiple Airlines Logo
7:00 a.m. - 5:15 p.m.
DEN
-
YOW
8h 15m1 stop
C$ 355Multiple Airlines
Wed, 20 May - Mon, 25 May
WestJet Logo
5:15 p.m. - 11:25 a.m.
YOW
-
DEN
20h 10m2 stops
WestJet Logo
12:15 p.m. - 5:28 a.m.
DEN
-
YOW
15h 13m2 stops
C$ 374WestJet
Thu, 29 Jan - Mon, 2 Feb
Multiple Airlines Logo
3:55 p.m. - 6:37 p.m.
YOW
-
DEN
28h 42m2 stops
Multiple Airlines Logo
7:00 a.m. - 5:15 p.m.
DEN
-
YOW
8h 15m1 stop
C$ 392Multiple Airlines
Tue, 27 Jan - Sat, 31 Jan
Multiple Airlines Logo
7:00 a.m. - 12:03 p.m.
YOW
-
DEN
31h 03m2 stops
Multiple Airlines Logo
7:00 a.m. - 5:15 p.m.
DEN
-
YOW
8h 15m1 stop
C$ 394Multiple Airlines
Sat, 28 Feb - Tue, 10 Mar
Multiple Airlines Logo
8:40 a.m. - 8:16 p.m.
YOW
-
DEN
13h 36m2 stops
Multiple Airlines Logo
11:59 p.m. - 11:58 p.m.
DEN
-
YOW
21h 59m1 stop
C$ 408Multiple Airlines
Tue, 27 Jan - Mon, 2 Feb
Multiple Airlines Logo
9:30 a.m. - 10:00 a.m.
YOW
-
DEN
26h 30m1 stop
Multiple Airlines Logo
7:00 a.m. - 5:15 p.m.
DEN
-
YOW
8h 15m1 stop
C$ 412Multiple Airlines
Thu, 29 Jan - Mon, 2 Feb
Multiple Airlines Logo
9:40 a.m. - 8:00 p.m.
YOW
-
DEN
12h 20m1 stop
Multiple Airlines Logo
7:00 a.m. - 5:15 p.m.
DEN
-
YOW
8h 15m1 stop
C$ 440Multiple Airlines
Tue, 10 Mar - Tue, 17 Mar
Multiple Airlines Logo
3:05 p.m. - 8:20 a.m.
YOW
-
DEN
19h 15m2 stops
Multiple Airlines Logo
11:59 p.m. - 11:58 p.m.
DEN
-
YOW
21h 59m1 stop
C$ 442Multiple Airlines
Booking Insights

KAYAK's insights & trends for Ottawa to Denver flights

Get data-powered insights and trends into flights from Ottawa to Denver to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Ottawa to Denver?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ottawa to Denver departing in May.

What is the cheapest month to fly from Ottawa to Denver?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ottawa to Denver, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ottawa to Denver is September, where tickets cost C$ 451 (return) on average. On the other hand, the most expensive months are January and December, where the average cost of round-trip tickets is C$ 1,256 and C$ 828 respectively.

How far in advance should I book a flight from Ottawa to Denver?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ottawa to Denver, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ottawa to Denver, you should book around 5 weeks before departure, which saves you about 49% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Good to know

Low seasonApril
Cheapest flightC$ 219
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly (17% more expensive on average)
Flight from Ottawa to Denver

When to book flights from Ottawa to Denver

Are your dates flexible? Find out the best times to travel from Ottawa to Denver based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ottawa to Denver

  • What is the cheapest flight from Ottawa to Denver?

    In the last 3 days, the lowest price for a flight from Ottawa to Denver was C$ 219 for a one-way ticket and C$ 331 for a round-trip.

  • Which airports will I be using when flying from Ottawa to Denver?

    When flying out of Ottawa you will be using Ottawa. You will be landing at Denver, also known as Denver Intl.

  • Which aircraft models fly most regularly from Ottawa to Denver?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ottawa to Denver?

    Star Alliance is the only airline alliance operating flights between Ottawa and Denver.

  • Which is the best airline for flights from Ottawa to Denver, United Airlines or WestJet?

    The two airlines most popular with KAYAK users for flights from Ottawa to Denver are United Airlines and WestJet. With an average price for the route of C$ 535 and an overall rating of 7.4, United Airlines is the most popular choice. WestJet is also a great choice for the route, with an average price of C$ 475 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from Ottawa to Denver?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ottawa to Denver.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ottawa to Denver?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from Ottawa is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ottawa to Denver?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back to Ottawa with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ottawa to Denver?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from Ottawa up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines flying from Ottawa to Denver

 
See real verified KAYAK customer reviews for airlines flying from Ottawa to Denver. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ottawa to Denver? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9143 reviews
8.1Crew
7.7Boarding
7.1Entertainment
6.6Food
7.3Comfort
Airline reviews

The flight was delayed by two de-icings. The seatbelt did not work correctly. It did not stay tight.

6.0 GoodAnonymous, Jan 2026
MKE - DEN
Read more United Airlines reviews

The flight was delayed by two de-icings. The seatbelt did not work correctly. It did not stay tight.

Hotter than Hades in August. Why, why do crews think that in the winter when we are already dressed for cold weather we need a cabin that is 82 degrees. Even the vents were blowing hot air.

Flight was delayed. De-icing took a while. When we landed had to wait for another plane to vacate our gate. Just an overall bad experience.

Not good - outbound flight was delayed and missed my connection even though I got to the gate after running through the airport - the agent would not let me on because the door was closed (flight had not left). There was no notification from United - overall experience was very disappointing. Additionally, I was downgraded from first class to coach on the alternative flight

United have really come back. Airport and boarding process is clear and good, app and information also very good

We Left Calgary 1/2 hour late and that made for a tight connection in Denver. After arriving everything was done to help us make our connection. That was a great effort. Thank You United

The entertainment available didn’t work for anyone on the flight. Long 6 hr flight with no entertainment option and the staff didn’t know until an hour into the flight when we made sure they knew about it. They had no way to fix it.

Late FA meant slow boarding. WiFi did not work. I’m a medium plus sized passenger. The seatbelt was for the first time ever barely fitting. And we delayed on the tarmac 40 min

My husband and I had boarded the flight from Denver to Chicago, and one of the last passengers to get on the plane opened the overhead bin above my husband's seat and threw his bag out of the bin to make space for his own. He said, "Mine is bigger!" The flight attendant supported the new passenger. They didn't care that my husband has two artificial knees and must have the foot room in front of his seat to be able to fit his legs in -- and to be able to stand, much less walk, at the end of the flight. I have never seen this happen before, and it was a disaster.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

I will not be flying with westjet again. I was uncomfortable in my seat. The position made my back hurt so bad. My wife was able to fit the seatbelt around her with out an extension but was unable to put the tray table down or fit in the seat for that matter. Our bag was smashed and I spent two hours trying to fill out the application for a damaged bag before I gave up. The 80 photos I took would not work and nothing telling me the format to upload them as.. I made the mistake of unpacking the bag before taking photos so no claim for me. Next trip to Canada I will have to use air Canada.

My luggage was damaged 1 wheel was out I can't find it nowhere

Took 3 hours to check in and drop off our suitcases. Half of the passengers were still in line by boarding time. The computer systems and staff were very slow. Staff were also disorganized and kept allowing later flights to skip lines. Suitcases were piling on that several other passengers didn't get their suitcases. Then, we were sitting in the plane for 2 hours and were told that the flight was overbooked. We missed our connecting flight and had to fly the following day but with a stop over. Good thing ONE WestJet customer rep was pleasant and actually knew how to do her job when we wanted to rebook to a direct flight. Thank you to Kim at Toronto airport. Terrible experience at PUJ. Won't go back to Dominican Republic.

Great seats, super comfortable, but no in flight entertainment which was a let down

Airplane is too small. Crew, especially the flight attendant who looked after our area, was not at all friendly and a touch authoratative. She may have been the most gruff flight attendant i've come across in 40 years of business travel

I when to Jamaica for my dad funeral and I did not get my luggage from westjet . I add to buy clothes putting me financial debt i did no want to be in Westjet did not call me to apologize are to inquire about my luggage I am still angry about it

Ground staff was not helpful, but staff at the business counter were excellent.

I selected "carry-on" for a round trip on Kayak, but my return flight on WestJet did not include a carry-on and they would not allow me to add one. My only option was to add a "checked bag" which I had to wait for on the luggage carousel after landing. Not a good experience.

We landed 26 min early. It was awesome! Smooth ride too.

There is no snack and nit much that would be considered gluten free in yiur food selections. One of your snacks should be a gluten free cookie or small bar etc. maybe it was me but I didn’t see any free movies just internet connection and YouTube .

We were happy with the service and cost of checking a bag

Wifi was great. Kind air crew and comfortable seating. Also liked the entertainment options.

Flying with Air Canada is still better than the discount airlines like Flair. The seats are more comfortable and the on-board entertainment is better, with each seat having a built in screen and lots of content to watch. Onboard WIFI is also great to have, as well as plugs for charging. I think passengers in general are getting better at not bringing too much luggage onboard, and Air Canada is better at managing this without customers feeling like they are being taken advantage of with extra fees. I have travelled on different airlines and all seem to be loading faster, with fewer people bringing both a carry on and a personal item. Now I just bring one item and it fits under the seat so I don't need to worry about finding a place in the overhead bins. Overall, across the industry, asking customers to pay for carry on baggage is fair because it allows customers to only pay for what they need, and it helps to keep the planes on time. Kudos to Air Canada for its approach - the desired result is achieved without customers feeling that they are being surprised and caught with unexpected extra fees.

Due to the strike by AC flight attendants, my flight was cancelled. Very disappointing! A refund is being processed. This was not a Kayak issue. I will be sure to come back to Kayak in the future.

I did not noticed baggage was separate - I had assumed international flights included luggage, so it surprised me I had to pay to check a bag.

Staff was very courteous and kept things organized. We will definitely use Air Canada for further travel

In a nutshell, my bag, the one I have to pay for, because now you can’t even bring a carry on, did not make it. I am still waiting for an update. The fact that not only were have to pay for it, but on top of that we are stuck without getting it, it’s ridiculous..

Great flights. 90 minute departure delay for maintenance issues, not a great start but, afer that very good. Didn't pay extra for seats and lucked into a window and an aisle seat. Price was excellent at the super low economy level.

Just a little improvement on food but everything is excellent

flight landed late almost 1.00hr and we 4 passengers missed our connected flight to indianapolis, we need to get the hotel and taxi for the next day flight to home in indianapolis, cost us $ 300 more

Everything you need to know for your flight from Ottawa to Denver

Information on your arrival and departure airports