YOW - DEN

$217 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 8/9. 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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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$386
Typical prices: $304-$450
WestJet
Sat 8/29Mon 8/31
YOW - DEN • 2 stops
Cheapest one-way
$217
Typical prices: $384-$474
WestJet
Sun 8/9
YOW - DEN • 2 stops
Top airlines
WestJet
Cheapest • from $386 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ottawa and Denver. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Montreal (YUL)
Cheapest • Avg $655 (round-trip)
Montreal (YUL)
Shortest trip • 6h 34m (one-way)
Insights
Insights
Insights
Insights
When to book
5 weeks
in advance
Our data shows that travelers who book at least 5 weeks in advance save around 65% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
September
Cheapest • 43% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s 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

Sat, Aug 29 - Mon, Aug 31
WestJet Logo
6:15 pm - 11:20 am
YOW
-
DEN
19h 05m
2 stops
WestJet Logo
12:15 pm - 5:15 pm
DEN
-
YOW
27h 00m
1 stop
$386WestJet
Sat, Aug 29 - Mon, Aug 31
WestJet Logo
6:15 pm - 11:20 am
YOW
-
DEN
19h 05m
2 stops
WestJet Logo
12:15 pm - 5:35 pm
DEN
-
YOW
27h 20m
2 stops
$387WestJet
Sat, Aug 29 - Mon, Aug 31
WestJet Logo
4:15 pm - 11:20 am
YOW
-
DEN
21h 05m
1 stop
WestJet Logo
12:15 pm - 7:20 pm
DEN
-
YOW
29h 05m
1 stop
$402WestJet
Sat, Oct 10 - Thu, Oct 15
WestJet Logo
7:20 am - 11:20 am
YOW
-
DEN
30h 00m
1 stop
WestJet Logo
12:15 pm - 12:30 pm
DEN
-
YOW
22h 15m
2 stops
$407WestJet
Thu, Oct 1 - Mon, Oct 5
WestJet Logo
6:55 am - 11:20 am
YOW
-
DEN
30h 25m
2 stops
WestJet Logo
12:15 pm - 12:30 pm
DEN
-
YOW
22h 15m
2 stops
$409WestJet
Thu, Oct 1 - Mon, Oct 5
WestJet Logo
4:15 pm - 11:20 am
YOW
-
DEN
21h 05m
1 stop
WestJet Logo
12:15 pm - 12:30 pm
DEN
-
YOW
22h 15m
2 stops
$416WestJet
Fri, Sep 4 - Sun, Sep 6
WestJet Logo
6:15 pm - 11:20 am
YOW
-
DEN
19h 05m
2 stops
WestJet Logo
12:15 pm - 12:20 am
DEN
-
YOW
34h 05m
2 stops
$418WestJet
Fri, Sep 4 - Sun, Sep 6
WestJet Logo
6:15 pm - 11:20 am
YOW
-
DEN
19h 05m
2 stops
WestJet Logo
12:15 pm - 12:40 am
DEN
-
YOW
10h 25m
1 stop
$420WestJet
Thu, Oct 1 - Mon, Oct 5
WestJet Logo
4:15 pm - 11:20 am
YOW
-
DEN
21h 05m
1 stop
WestJet Logo
12:15 pm - 5:35 am
DEN
-
YOW
15h 20m
1 stop
$424WestJet
Fri, Sep 4 - Sun, Sep 6
WestJet Logo
8:15 pm - 11:20 am
YOW
-
DEN
17h 05m
1 stop
WestJet Logo
12:15 pm - 12:40 am
DEN
-
YOW
10h 25m
1 stop
$425WestJet
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 August.

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 $322 (return) on average. On the other hand, the most expensive months are January and May, where the average cost of round-trip tickets is $906 and $659 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 65% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Find deals

Good to know

Low seasonFebruary
Cheapest flight$217
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly with an average 5% increase in price.
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 5 days, the lowest price for a flight from Ottawa to Denver was $217 for a one-way ticket and $386 for a round-trip.

  • Do I need a passport to fly between Ottawa and Denver?

    A passport is required to fly from Ottawa to Denver.

  • 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 Air Canada?

    The two airlines most popular with KAYAK users for flights from Ottawa to Denver are United Airlines and Air Canada. With an average price for the route of $621 and an overall rating of 7.4, United Airlines is the most popular choice. Air Canada is also a great choice for the route, with an average price of $674 and an overall rating of 7.1.

  • 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. Booking your flights between Ottawa and DEN can sometimes prove cheaper using this method.

  • 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 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 9909 reviews
7.1Entertainment
7.3Comfort
6.6Food
7.7Boarding
8.1Crew
Airline reviews

Boarding was smooth and efficient. The only food was some pretzels, but it was a short flight. Not much to order if you were hungry.

8.0 ExcellentJane, Jun 2026
YYZ - DEN
Read more United Airlines reviews

Boarding was smooth and efficient. The only food was some pretzels, but it was a short flight. Not much to order if you were hungry.

They were fast and I like how they used to entertainment system to play video about the safety.

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

Efficient, calm when things were delayed and kept us regularly informed of what was happening.

Plane temperature was comfortable (not to hot) when boarding and waiting for takeoff.

Not as good as expected Air Can needs to improve totally rated on internet as worst

United airlines was top for my last trip in every way

Bad, they delayed my flight, lost my connection flight had to stay overnight for the next flight and missed a lot of important meetings. 1 day totally lost!

Boarding was quick and efficient which was nice and it was a nice treat to have a screen to watch a show for the quick flight!

airport arrival to Denver direction to where to go was not clearvfor Me.

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

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..

Overall good experience. The flight from Toronto to Denver does not have entertainment - movies to watch.

I was overcharged either by United or sister airline Air Canada. It's exhausting dealing with companies nowadays that irresponsibly abuse access to credit/debit cards.

The flight attendants that assisted me were exceptionally nice, kind and helpful

Very good. But seat selection was not good. We were put on different rows. Would have been nicer to sit besides each other as a couple.

The crew and the flight was excellent. Captain kept us informed about weather and possibly of turbulence and I appreciated that! The only thing is they didn’t have tv monitors. Other than that, everything was great.

It was an excellent experience, traveling from Toronto to Denver with United.

The boarding process in Toronto bad as they share space with domestic flights and when those domestic flights come in you are locked out behind closed doors until they are done and then its a mad rush to get your boarding gates and board. This is not so much due to Air Canada but with the GTAA, but Air Canada could use different gates especially early morning in order to prevent such travel angst.

Fight left late making it extremely hard to make the connection. Flight staff was pleasant and efficient.

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

Information on your arrival and departure airports

Ottawa (YOW)
Denver (DEN)