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Cheap flights from Ottawa to Denver from C$ 303

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 14/9. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — DEN
10 Sep — 17 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap 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 11 August 2026.

Thu 24/94:15 p.m. -
1 stop21h 05m
Thu 1/1012:15 p.m. -
1 stop15h 20m
Deal found 10/8C$ 495
Thu 1/101:20 p.m. -
1 stop24h 00m
Mon 5/1012:15 p.m. -
1 stop29h 05m
Deal found 6/8C$ 554
Sun 13/97:20 a.m. -
2 stops18h 28m
Mon 14/96:40 a.m. -
1 stop15h 08m
Deal found 10/8C$ 580
Thu 24/98:15 p.m. -
1 stop17h 05m
Thu 1/107:00 a.m. -
2 stops20h 35m
Deal found 10/8C$ 588
Thu 1/102:00 p.m. -
2 stops23h 20m
Mon 5/1012:15 p.m. -
1 stop15h 20m
Deal found 6/8C$ 604
Sat 5/97:00 a.m. -
1 stop26h 33m
Mon 28/97:00 a.m. -
2 stops20h 35m
Deal found 5/8C$ 611
Fri 4/97:00 a.m. -
1 stop27h 07m
Mon 28/97:00 a.m. -
2 stops20h 35m
Deal found 5/8C$ 614
Sun 6/97:20 a.m. -
1 stop30h 00m
Sun 13/97:00 a.m. -
2 stops34h 20m
Deal found 9/8C$ 621
Mon 31/88:15 p.m. -
1 stop17h 05m
Mon 28/97:00 a.m. -
2 stops20h 35m
Deal found 5/8C$ 625
Mon 31/88:15 p.m. -
1 stop17h 05m
Thu 1/1012:15 p.m. -
1 stop15h 20m
Deal found 5/8C$ 640

Find 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 11 August 2026.

Round-trip from

C$ 495

One-way from

C$ 303

Popular in

January

Cheapest in

September

Average price

C$ 595
WestJet
  • WestJet
  • 24/9-1/10
  • 2 total stops
  • 36h 25m total
  • Ottawa to Denver
Search Deals
14/9
  • 14/9
  • 2 total stops
  • 30h 48m total
  • Ottawa to Denver
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 212 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (C$ 58 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
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 629,999 searches. Data last updated 11 August 2026.
Use the filters below to find and compare flights from Ottawa to Denver that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Sun 6/9

7:20 a.m.-11:20 a.m.

1 stop30h 00m

Denver Intl

Sun 13/9

7:12 p.m.-11:48 p.m.

1 stop26h 36m

C$ 654

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Tue 22/9

6:55 a.m.-7:05 p.m.

2 stops14h 10m

Denver Intl

Sat 26/9

6:30 a.m.-5:35 p.m.

2 stops9h 05m

C$ 756

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Thu 10/9

4:15 p.m.-11:20 a.m.

1 stop21h 05m

Denver Intl

Mon 14/9

12:15 p.m.-5:35 a.m.

1 stop15h 20m

C$ 793

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Fri 25/9

12:25 p.m.-11:35 p.m.

2 stops13h 10m

Denver Intl

Sun 27/9

6:30 a.m.-12:20 a.m.

2 stops15h 50m

C$ 795

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Sun 6/9

6:55 a.m.-5:23 p.m.

2 stops12h 28m

Denver Intl

Sun 27/9

6:30 a.m.-12:20 a.m.

2 stops15h 50m

C$ 858

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Thu 10/9

6:55 a.m.-9:13 p.m.

2 stops16h 18m

Denver Intl

Mon 14/9

6:30 a.m.-12:20 a.m.

2 stops15h 50m

C$ 859

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Thu 19/11

3:15 p.m.-11:09 p.m.

1 stop9h 54m

Denver Intl

Sun 22/11

11:59 p.m.-2:45 p.m.

1 stop12h 46m

C$ 895

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Thu 24/9

10:00 a.m.-11:20 a.m.

3 stops27h 20m

Denver Intl

Thu 1/10

12:15 p.m.-7:47 p.m.

3 stops29h 32m

C$ 918
Quickest round-trip

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Sun 30/8

6:00 a.m.-10:33 a.m.

1 stop6h 33m

Denver Intl

Tue 1/9

9:45 a.m.-9:35 p.m.

1 stop9h 50m

C$ 920
Cheapest one-way

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Mon 14/9

4:15 p.m.-9:03 p.m.

2 stops30h 48m

C$ 303

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/8

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

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

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

Currently, September is the cheapest month in which you can book a flight from Ottawa to Denver (average of C$ 406). Flying from Ottawa to Denver in January is currently the most expensive (average of C$ 1,263). 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?

Airfare is typical for this route at the moment.

Ottawa to Denver flights typically cost between C$ 467 and C$ 929 in September.
The cheapest round-trip price found within the last 5 days was C$ 495 on WestJet (24 Sep-1 Oct).

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 11 August 2026.
Read reviews from past customers who have flown United Airlines and Air 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
10,100 reviews
Check prices

Boarding

7.7

Comfort

7.3

Food

6.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
United Airlines
7.4
Good
10,100 reviews
United Airlines
7.4
Good
10,100 reviews
Check prices

Boarding

7.7

Comfort

7.3

Food

6.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
Air Canada
7.1
Good
11,460 reviews
United Airlines
7.4
Good
10,100 reviews
Check prices

Boarding

7.7

Comfort

7.3

Food

6.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible

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 Delta and WestJet fly from Ottawa to Denver in about 14h 10m. The time it takes to get you to your destination can typically vary by up to 6h 55m. The distance from Ottawa to Denver is about 2435 km. This flight may include one or multiple stops.

  • 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$ 307 on this airline. An additional option worth looking into is Air Canada, starting at C$ 399. You may be able to fly from Ottawa to Denver for 62% 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, September is the cheapest month in which you can book a flight from Ottawa to Denver (average of C$ 406). Flying from Ottawa to Denver in January is currently the most expensive (average of C$ 1,263). 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
Thornton
Black Hawk

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 629,999 searches. Data last updated 11 August 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 307AverageC$ 647FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 399AverageC$ 814FlexibilityNo 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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