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Cheap flights from Ottawa to Denver from C$ 218

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 14/5. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — DEN
7 Feb — 14 Feb1
1 adult
1 adult, Economy, 0 bags

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 8 January 2026.

Round-trip from

C$ 330

One-way from

C$ 218

Popular in

January

Cheapest in

September

Average price

C$ 1,252
WestJet
  • WestJet
  • 20/5-25/5
  • 3 total stops
  • 30h 35m total
  • Ottawa to Denver
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WestJet
  • WestJet
  • 14/5
  • 2 total stops
  • 20h 10m total
  • Ottawa to Denver
Search Deals
Highest demand for flights based on searches. 26% potential increase in price (C$ 358 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease (C$ 71 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from Ottawa to Denver

Enter your travel dates to find the best prices.

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 8 January 2026.

Wed 20/55:15 p.m.YOW - DEN
2 stops20h 10mWestJet
Mon 25/512:15 p.m.DEN - YOW
1 stop10h 25mWestJet
Deal found 7/1C$ 330
Tue 27/17:00 a.m.YOW - DEN
2 stops31h 03mMultiple Airlines
Mon 2/27:00 a.m.DEN - YOW
1 stop8h 15mMultiple Airlines
Deal found 7/1C$ 354
Thu 29/13:55 p.m.YOW - DEN
2 stops28h 42mMultiple Airlines
Mon 2/27:00 a.m.DEN - YOW
1 stop8h 15mMultiple Airlines
Deal found 7/1C$ 391
Tue 27/17:00 a.m.YOW - DEN
2 stops31h 03mMultiple Airlines
Sat 31/17:00 a.m.DEN - YOW
1 stop8h 15mMultiple Airlines
Deal found 7/1C$ 393
Sat 28/28:40 a.m.YOW - DEN
2 stops13h 36mMultiple Airlines
Tue 10/311:59 p.m.DEN - YOW
1 stop21h 59mMultiple Airlines
Deal found 8/1C$ 406
Mon 9/29:40 a.m.YOW - DEN
1 stop12h 20mMultiple Airlines
Wed 18/212:59 a.m.DEN - YOW
2 stops21h 26mMultiple Airlines
Deal found 6/1C$ 445
Mon 30/39:30 a.m.YOW - DEN
1 stop15h 39mMultiple Airlines
Wed 1/411:59 p.m.DEN - YOW
2 stops22h 26mMultiple Airlines
Deal found 7/1C$ 456

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 629,999 searches. Data last updated 8 January 2026.
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

Wed 20/5

5:15 p.m.-11:25 a.m.

2 stops20h 10m

Denver Intl

Mon 25/5

12:15 p.m.-5:28 a.m.

2 stops15h 13m

C$ 373

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 29/1

3:55 p.m.-6:37 p.m.

2 stops28h 42m

Denver Intl

Mon 2/2

7:00 a.m.-5:15 p.m.

1 stop8h 15m

C$ 391

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 27/1

7:00 a.m.-12:03 p.m.

2 stops31h 03m

Denver Intl

Sat 31/1

7:00 a.m.-5:15 p.m.

1 stop8h 15m

C$ 393

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 28/1

9:30 a.m.-8:30 a.m.

1 stop25h 00m

Denver Intl

Mon 2/2

7:00 a.m.-5:15 p.m.

1 stop8h 15m

C$ 411

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 27/1

9:30 a.m.-10:00 a.m.

1 stop26h 30m

Denver Intl

Mon 2/2

7:00 a.m.-5:15 p.m.

1 stop8h 15m

C$ 411

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 9/2

9:40 a.m.-8:00 p.m.

1 stop12h 20m

Denver Intl

Wed 18/2

12:59 a.m.-12:25 a.m.

2 stops21h 26m

C$ 445

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 28/1

9:30 a.m.-8:30 a.m.

1 stop25h 00m

Denver Intl

Sat 31/1

7:00 a.m.-5:15 p.m.

1 stop8h 15m

C$ 449

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 30/3

9:30 a.m.-11:09 p.m.

1 stop15h 39m

Denver Intl

Wed 1/4

11:59 p.m.-12:25 a.m.

2 stops22h 26m

C$ 456

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 29/1

3:55 p.m.-8:21 a.m.

2 stops18h 26m

Denver Intl

Sat 31/1

7:00 a.m.-5:15 p.m.

1 stop8h 15m

C$ 464

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 16/6

3:45 p.m.-11:25 a.m.

1 stop21h 40m

Denver Intl

Sat 27/6

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

1 stop10h 25m

C$ 506

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/1

Showing 1-10 of 17 results
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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 2 January 2026.

To ensure you get the cheapest price possible for a flight from Ottawa to Denver, you should look to book at least 78 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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 C$ 256). Flying from Ottawa to Denver in January is currently the most expensive (average of C$ 528). 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 Ottawa 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 8 January 2026.
Read reviews from past customers who have flown United Airlines,WestJet, andAir Canada from Ottawa to Denver. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,139 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

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
9,139 reviews
United Airlines
7.4
Good
9,139 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

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.
WestJet
7.2
Good
3,235 reviews
United Airlines
7.4
Good
9,139 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

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
10,603 reviews
United Airlines
7.4
Good
9,139 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

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.

  • How long is the flight from Ottawa to Denver?

    Airlines like WestJet fly from Ottawa to Denver in about 20h 10m. The time it takes to get you to your destination can typically vary by up to . The distance from Ottawa to Denver is about 2435 km.

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

    Our cheapest airline available from Ottawa to Denver is United Airlines. Our recent data shows that you can find tickets from as low as C$ 305 on this airline. Additional options worth looking into are WestJet and Air Canada, starting at C$ 330 and C$ 430 round-trip. You may be able to fly from Ottawa to Denver for 56% less than the average price by searching for these airlines.

  • 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 C$ 256). Flying from Ottawa to Denver in January is currently the most expensive (average of C$ 528). 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

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Ottawa to Denver

Discover the top 3 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 629,999 searches. Data last updated 8 January 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 305AverageC$ 533FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 330AverageC$ 474FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 430AverageC$ 673FlexibilityNo cancel feeOn-time67%
Search Air Canada 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 Ottawa to Denver?

Deals for Ottawa to Denver flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Denver?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ottawa to Denver for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Ottawa to Denver with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Ottawa to Denver flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Ottawa to Denver become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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