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Cheap flights from Ottawa to Denver from C$ 266

YOW — DEN
12 Oct — 19 Oct1
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

Sat 17/104:15 p.m. -
1 stop21h 05m
Thu 22/1010:44 p.m. -
2 stops28h 51m
Deal found 9/9C$ 471
Wed 7/108:15 p.m. -
1 stop17h 05m
Wed 14/1010:44 p.m. -
2 stops28h 51m
Deal found 9/9C$ 475
Sat 17/104:15 p.m. -
1 stop21h 05m
Sat 24/101:07 p.m. -
2 stops14h 28m
Deal found 9/9C$ 489
Sat 17/104:15 p.m. -
1 stop21h 05m
Mon 26/1010:44 p.m. -
2 stops24h 16m
Deal found 9/9C$ 496
Fri 2/101:20 p.m. -
2 stops30h 55m
Mon 5/1012:15 p.m. -
1 stop15h 20m
Deal found 8/9C$ 515
Fri 2/101:20 p.m. -
2 stops22h 12m
Sun 4/1012:15 p.m. -
1 stop15h 20m
Deal found 8/9C$ 524
Sat 17/104:15 p.m. -
1 stop21h 05m
Fri 23/101:07 p.m. -
2 stops14h 28m
Deal found 9/9C$ 529
Sat 17/104:15 p.m. -
1 stop21h 05m
Tue 27/106:31 p.m. -
2 stops20h 49m
Deal found 9/9C$ 536
Sat 17/104:15 p.m. -
1 stop21h 05m
Wed 21/101:10 p.m. -
2 stops28h 10m
Deal found 9/9C$ 538
Fri 2/106:15 p.m. -
2 stops43h 05m
Mon 5/1012:15 p.m. -
1 stop27h 00m
Deal found 8/9C$ 549
Fri 2/106:55 a.m. -
2 stops14h 14m
Tue 6/106:20 a.m. -
2 stops9h 15m
Deal found 11/9C$ 568

Find flight deals from Ottawa to Denver

Round-trip from

C$ 471

One-way from

C$ 266

Popular in

January

Cheapest in

October

Average price

C$ 691
17/10-22/10
  • 17/10-22/10
  • 3 total stops
  • 49h 56m total
  • Ottawa to Denver
Search Deals
WestJet
  • WestJet
  • 10/10-31/12
  • 1 total stop
  • 21h 05m total
  • Ottawa to Denver
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (C$ 126 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 49 potential savings vs. average RT price).
Search Deals
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 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

Thu 22/10

1:20 p.m.-8:17 p.m.

2 stops32h 57m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 269

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Tue 22/9

6:55 a.m.-5:21 p.m.

2 stops12h 26m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 321

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Fri 25/9

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

2 stops14h 10m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 331

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Tue 22/9

6:25 p.m.-11:20 a.m.

2 stops42h 55m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 346
Quickest round-trip

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Tue 22/9

6:00 a.m.-10:31 a.m.

1 stop6h 31m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 402

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Tue 6/10

6:00 a.m.-10:31 a.m.

1 stop6h 31m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 436

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Tue 22/9

1:20 p.m.-8:15 a.m.

3 stops20h 55m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 464

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Sat 10/10

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

1 stop30h 00m

Denver Intl

Sat 17/10

1:10 p.m.-5:35 a.m.

2 stops14h 25m

C$ 586

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Wed 21/10

6:50 a.m.-8:11 p.m.

2 stops15h 21m

Denver Intl

Fri 23/10

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

2 stops16h 00m

C$ 622

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Fri 2/10

6:55 a.m.-7:09 p.m.

2 stops14h 14m

Denver Intl

Mon 5/10

12:59 a.m.-5:35 p.m.

2 stops14h 36m

C$ 622

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

Showing 1-10 of 18 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

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, October is the cheapest month in which you can book a flight from Ottawa to Denver (average of C$ 449). Flying from Ottawa to Denver in January is currently the most expensive (average of C$ 1,255). 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.

Reviews of airlines servicing Denver

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
10,206 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.7

Entertainment

7.1

Overall

7.4

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
10,206 reviews
United Airlines
7.4
Good
10,206 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.7

Entertainment

7.1

Overall

7.4

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
11,617 reviews
United Airlines
7.4
Good
10,206 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.7

Entertainment

7.1

Overall

7.4

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

  • How long is the flight from Ottawa to Denver?

    Airlines like Delta fly from Ottawa to Denver in about 15h 21m. 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$ 376 on this airline. An additional option worth looking into is Air Canada, starting at C$ 396. 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, October is the cheapest month in which you can book a flight from Ottawa to Denver (average of C$ 449). Flying from Ottawa to Denver in January is currently the most expensive (average of C$ 1,255). 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

Top 2 airlines flying from Ottawa to Denver

AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 376AverageC$ 776FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 396AverageC$ 828FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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