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$171+ Cheap flights from Denver (DEN) to Ottawa (YOW)

DEN — YOW
Oct 11 — Oct 181
Sun 10/11
Sun 10/18
1 adult, Economy
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Cheap flight deals from Denver to Ottawa

Cheapest flights from Denver to Ottawa

Fri 10/212:15 pm -
1 stop15h 20m
Sun 10/114:15 pm -
1 stop21h 05m
Deal found 9/8$364
Thu 10/1512:15 pm -
1 stop15h 20m
Sat 10/174:15 pm -
1 stop21h 05m
Deal found 9/9$366
Fri 10/27:00 am -
2 stops20h 35m
Sun 10/114:15 pm -
1 stop21h 05m
Deal found 9/8$368
Thu 10/112:15 pm -
1 stop22h 40m
Tue 10/61:20 pm -
2 stops22h 12m
Deal found 9/8$408

Find flight deals from Denver to Ottawa

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$364
(Kiwi.com)

One-way from

$171
(Kiwi.com)

Popular in

March

Cheapest in

October

Average price

$827
Provider with most accurate pricing for Denver Intl-Ottawa flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Ottawa flights.
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From Denver Intl to Ottawa
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One-way flight from Denver Intl to Ottawa
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($84 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($30 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Denver to Ottawa that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Fri 9/25

12:15 pm-12:30 pm

2 stops22h 15m

Ottawa

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$171

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Fri 9/25

12:15 pm-5:58 pm

1 stop27h 43m

Ottawa

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$248
Quickest round-trip

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Mon 10/26

6:00 am-7:27 pm

1 stop11h 27m

Ottawa

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$379

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Fri 10/2

12:15 pm-5:35 am

1 stop15h 20m

Ottawa

Sun 10/11

1:20 pm-11:20 am

1 stop24h 00m

$404

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Thu 10/1

7:50 pm-5:58 pm

2 stops20h 08m

Ottawa

Tue 10/6

2:00 pm-4:58 pm

3 stops28h 58m

$422

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Wed 11/11

2:14 pm-1:10 pm

2 stops20h 56m

Ottawa

Sun 11/15

8:00 am-8:13 am

1 stop26h 13m

$530

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Thu 10/8

7:50 pm-12:20 am

3 stops26h 30m

Ottawa

Wed 10/14

6:55 am-8:17 pm

1 stop15h 22m

$548

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Wed 10/21

12:59 am-5:35 pm

2 stops14h 36m

Ottawa

Thu 10/29

5:30 am-5:52 pm

2 stops14h 22m

$608

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Mon 10/12

12:15 pm-5:35 pm

2 stops27h 20m

Ottawa

Fri 10/16

6:50 am-11:20 am

2 stops54h 30m

$637

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Thu 10/22

7:02 pm-2:30 pm

1 stop17h 28m

Ottawa

Thu 10/29

6:55 pm-8:15 pm

2 stops27h 20m

$667

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

Compare providers for flights from Denver to Ottawa

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Denver to Ottawa in September.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Denver-Ottawa flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Denver-Ottawa flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Denver-Ottawa flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Denver-Ottawa flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Denver-Ottawa flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Denver to Ottawa

Have a flexible travel schedule? Discover the best time to fly to Ottawa from Denver with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

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

What is the cheapest month to book a flight from Denver to Ottawa?

Currently, October is the cheapest month in which you can book a flight from Denver to Ottawa (average of $397). Flying from Denver to Ottawa in March is currently the most expensive (average of $1,142). 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.

How much does it cost to fly round-trip from Denver to Ottawa?

Airfare is below average for this route at the moment.

Denver to Ottawa flights typically cost between $369 and $878 in October.
The cheapest round-trip price found within the last 5 days was $364 on WestJet (Oct 2-Oct 11).

Reviews of airlines servicing Ottawa

Read through reviews of airlines operating flights from Denver to Ottawa, such as United Airlines and Air Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,197 reviews

Overall

7.4

Comfort

7.3

Crew

8.1

Food

6.7

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
10,197 reviews
United Airlines
7.4
Good
10,197 reviews

Overall

7.4

Comfort

7.3

Crew

8.1

Food

6.7

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
Air Canada
7.1
Good
11,611 reviews
United Airlines
7.4
Good
10,197 reviews

Overall

7.4

Comfort

7.3

Crew

8.1

Food

6.7

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Related info for your journey

  • How long is the flight from Denver to Ottawa?

    There are many flights that can get you from Denver to Ottawa in 14h 36m. Fly via Delta or WestJet to get the fastest option. Denver and Ottawa are separated by a distance of 1513 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Denver to Ottawa round-trip?

    Our cheapest airline available from Denver to Ottawa is Air Canada. Our recent data shows that you can find tickets from as low as $363 on this airline. An additional option worth looking into is United Airlines, starting at $509. Air Canada is priced at 55% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from Denver to Ottawa that include hotel bookings?

    Yes. In addition to deals on Denver to Ottawa flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Denver to Ottawa?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to Ottawa.

  • Can I find deals for business class flights from Denver to Ottawa?

    Yes. Cheapflights offers flight deals from Denver to Ottawa 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 Denver to Ottawa?

    Currently, October is the cheapest month in which you can book a flight from Denver to Ottawa (average of $397). Flying from Denver to Ottawa in March is currently the most expensive (average of $1,142). 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 Ottawa?

Book flights to Ottawa if you plan to visit one of these locations
Gatineau

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Alternative routes for Denver to Ottawa

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Denver to Hamilton flights
Denver to London flights
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Aspen to Ottawa flights

Top 2 airlines flying from Denver to Ottawa

AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$363Average$787FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$509Average$873FlexibilityNo cancel feeOn-time69%

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