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Denver

$187+ Cheap flights from Ottawa (YOW) to Denver (DEN)

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 2/11. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — DEN
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Ottawa to Denver Intl are usually found in September or October, booked 3 days in advance, depart on a Tuesday or Friday and return on a Wednesday

Find flight deals from Ottawa to Denver

Cheapest flights from Ottawa to Denver
Explore the most affordable flight options available from Ottawa to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 29, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/153:55 pmYOW - DEN
1 stop11h 28mMultiple Airlines
Wed 12/2410:37 pmDEN - YOW
2 stops47h 21mMultiple Airlines
Deal found 10/28$337
This Kiwi.com deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/114:15 pmYOW - DEN
2 stops42h 05mMultiple Airlines
Thu 12/186:00 amDEN - YOW
1 stop9h 10mMultiple Airlines
Deal found 10/27$409
This Kiwi.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1310:00 amYOW - DEN
2 stops17h 23mMultiple Airlines
Sat 12/2011:59 pmDEN - YOW
1 stop21h 59mMultiple Airlines
Deal found 10/29$453
This Kiwi.com deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/194:20 pmYOW - DEN
1 stop27h 14mMultiple Airlines
Mon 12/294:38 pmDEN - YOW
2 stops22h 35mMultiple Airlines
Deal found 10/26$455
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:15 amYOW - DEN
1 stop12h 14mUnited Airlines
Sat 12/276:00 amDEN - YOW
1 stop10h 52mUnited Airlines
Deal found 10/26$539
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:45 amYOW - DEN
1 stop16h 30mUnited Airlines
Thu 1/16:00 amDEN - YOW
1 stop15h 54mUnited Airlines
Deal found 10/29$540

Cheap flight deals from Ottawa to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$337
(Kiwi.com)

One-way from

$187
(Kiwi.com)

Popular in

January

Cheapest in

September

Average price

$332
Provider with most accurate pricing for Ottawa-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ottawa-Denver Intl flights.
Search Deals
From Ottawa to Denver Intl
Search Deals
One-way flight from Ottawa to Denver Intl
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($78 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ottawa 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 2,558,603 searches. Data last updated October 29, 2025.
Use the filters below to find and compare flights from Ottawa to Denver that are best for you.

Fly from

Ottawa

Fly to

Denver

Route

Depart

Return

Price

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 12/15

9:25 am-1:23 am

1 stop17h 58m

Denver Intl

Wed 12/24

4:25 pm-5:25 pm

1 stop23h 00m

$396

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 12/11

4:15 pm-8:20 am

2 stops42h 05m

Denver Intl

Thu 12/18

6:00 am-5:10 pm

1 stop9h 10m

$409

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 1/15

4:20 pm-11:12 pm

1 stop32h 52m

Denver Intl

Thu 1/22

2:43 pm-5:13 pm

2 stops24h 30m

$421

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 12/13

10:00 am-1:23 am

2 stops17h 23m

Denver Intl

Sat 12/20

11:59 pm-11:58 pm

1 stop21h 59m

$453

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Fri 12/19

4:20 pm-5:34 pm

1 stop27h 14m

Denver Intl

Mon 12/29

4:38 pm-5:13 pm

2 stops22h 35m

$455

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 2/11

9:30 am-3:55 pm

1 stop32h 25m

Denver Intl

Mon 2/23

11:59 pm-5:13 pm

1 stop15h 14m

$537

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 12/30

2:15 pm-12:15 am

1 stop12h 00m

Denver Intl

Thu 1/1

7:45 am-9:18 pm

1 stop11h 33m

$539

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 12/23

6:15 am-4:29 pm

1 stop12h 14m

Denver Intl

Sat 12/27

6:00 am-6:52 pm

1 stop10h 52m

$539

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 12/20

2:15 pm-12:15 am

1 stop12h 00m

Denver Intl

Sat 12/27

11:59 pm-2:27 pm

1 stop12h 28m

$553

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 2/11

9:30 am-5:38 pm

2 stops34h 08m

$187

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 16 results
1
2

Compare providers for flights from Ottawa to Denver

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ottawa to Denver in October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy2 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 Ottawa-Denver flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ottawa-Denver flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Ottawa-Denver flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ottawa-Denver flights, Cheapflights users trust eDreams the most. eDreams 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 Ottawa-Denver 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 Ottawa to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Ottawa 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 Ottawa to Denver

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

Use this chart to determine the optimal time to book a round-trip flight from Ottawa to Denver. Price data was last updated on October 24, 2025.

The price you pay for your flight from Ottawa to Denver may vary depending on when you book. For the best chance of a lower fare, look to book 3 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, April is the cheapest month in which you can book a flight from Ottawa to Denver (average of $194). Flying from Ottawa to Denver in February is currently the most expensive (average of $312). 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 YOW to DEN?

Find hourly flight availability from Ottawa 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 October 29, 2025.

A simple way to save on the total cost of your ticket is to fly from Ottawa to Denver in the morning. If you’re flexible enough to do this you can expect to save up to 37% on your trip compared to booking a flight in the afternoon.

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 October 29, 2025.
See what other customers who have flown with United Airlines and Air Canada from Ottawa to Denver have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,999 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
United Airlines
7.4
Good
8,999 reviews
United Airlines
7.4
Good
8,999 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Air Canada
7.1
Good
10,372 reviews
United Airlines
7.4
Good
8,999 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    Flying on United Airlines is currently your cheapest option to Denver, with prices starting at $251. Another option worth looking into is Air Canada, starting at $267 round trip. United Airlines is priced at 46% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

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

    Currently, April is the cheapest month in which you can book a flight from Ottawa to Denver (average of $194). Flying from Ottawa to Denver in February is currently the most expensive (average of $312). 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 Denver?

Book flights to Denver if you plan to visit one of these locations
Black Hawk
Westminster
Broomfield
Lakewood
Golden
Winter Park
Greeley
Lone Tree
Cripple Creek
Thornton
Silverthorne
Central City
Manitou Springs
Fort Morgan
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker
Sterling

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Ottawa to Denver

Discover the top 2 airlines that operate flights from Ottawa 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 2,558,603 searches. Data last updated October 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$251Average$437FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$267Average$629FlexibilityNo cancel feeOn-time67%

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