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Flights from Denver to Ottawa

Search cheap flights from Denver to Ottawa in the next 3 months. Based on Trip.com's latest 7-day data, one-way fares start at US$143, and round-trip tickets start at US$404.

      • DEN 06:00
        8h 32m
        1 stop
        YOW 16:32
        Denver - Ottawa | Tue, Dec 16 | United Airlines
        YOW 09:45
        16h 30m
        1 stop
        DEN 00:15
        Ottawa - Denver | Tue, Dec 23 | United Airlines
        US$404 US$697
        42% OFF
        42% OFF
        US$697 US$404
      • DEN 23:59
        21h 59m
        1 stop
        YOW 23:58
        Denver - Ottawa | Sun, Jan 11 | Frontier Airlines
        YOW 09:30
        15h 37m
        1 stop
        DEN 23:07
        Ottawa - Denver | Mon, Jan 19 | Porter Airlines
        US$431 US$697
        38% OFF
        38% OFF
        US$697 US$431
      • DEN 06:00
        6h 27m
        1 stop
        YOW 14:27
        Denver - Ottawa | Wed, Dec 31 | United Airlines
        YOW 19:27
        17h 1m
        1 stop
        DEN 10:28
        Ottawa - Denver | Wed, Dec 31 | United Airlines
        US$583 US$697
        16% OFF
        16% OFF
        US$697 US$583
      • DEN 06:00
        15h 54m
        1 stop
        YOW 23:54
        Denver - Ottawa | Tue, Dec 23 | United Airlines
        YOW 09:45
        16h 30m
        1 stop
        DEN 00:15
        Ottawa - Denver | Wed, Dec 31 | United Airlines
        US$594
        15% OFF
        US$697 US$594
      • DEN 19:15
        17h 45m
        1 stop
        YOW 15:00
        Denver - Ottawa | Mon, Jan 19 | Air Canada
        YOW 17:35
        17h 20m
        1 stop
        DEN 08:55
        Ottawa - Denver | Mon, Jan 26 | Air Canada
        US$595
        15% OFF
        US$697 US$595
      • DEN 23:59
        11h 33m
        1 stop
        YOW 13:32
        Denver - Ottawa | Thu, Dec 25 | United Airlines
        YOW 06:15
        13h 23m
        1 stop
        DEN 17:38
        Ottawa - Denver | Fri, Jan 2 | United Airlines
        US$609
        13% OFF
        US$697 US$609
      • DEN 23:59
        15h 26m
        1 stop
        YOW 17:25
        Denver - Ottawa | Tue, Dec 23 | Jetblue Airways
        YOW 17:59
        16h 34m
        1 stop
        DEN 08:33
        Ottawa - Denver | Wed, Dec 31 | United Airlines
        US$614
        12% OFF
        US$697 US$614
      • DEN 15:59
        22h 31m
        1 stop
        YOW 16:30
        Denver - Ottawa | Thu, Jan 15 | United Airlines
        YOW 06:00
        17h 24m
        1 stop
        DEN 21:24
        Ottawa - Denver | Mon, Jan 19 | United Airlines
        US$615
        12% OFF
        US$697 US$615
      • DEN 07:46
        12h 10m
        1 stop
        YOW 21:56
        Denver - Ottawa | Wed, Feb 4 | United Airlines
        YOW 17:55
        22h 7m
        1 stop
        DEN 14:02
        Ottawa - Denver | Mon, Feb 9 | United Airlines
        US$622
        11% OFF
        US$697 US$622
      • DEN 11:15
        6h 7m
        1 stop
        YOW 19:22
        Denver - Ottawa | Wed, Dec 17 | Air Canada
        YOW 09:45
        11h 43m
        1 stop
        DEN 19:28
        Ottawa - Denver | Thu, Dec 25 | United Airlines
        US$627
        10% OFF
        US$697 US$627
      • DEN 13:00
        17h 25m
        1 stop
        YOW Invalid Date
        Denver - Ottawa | Sat, Dec 13 | Normal Airline
        YOW 15:00
        6h
        Nonstop
        DEN 16:00
        Ottawa - Denver | Mon, Dec 15 | Normal Airline
        Find More Flights
        Find More Flights
      • DEN 18:31
        20h 42m
        1 stop
        YOW 17:13
        Denver - Ottawa | Mon, Dec 15 | Frontier Airlines
        US$143 US$704
        80% OFF
        80% OFF
        US$704 US$143
      • DEN 06:00
        13h 18m
        1 stop
        YOW 21:18
        Denver - Ottawa | Wed, Dec 24 | United Airlines
        US$144 US$704
        80% OFF
        80% OFF
        US$704 US$144
      • DEN 09:42
        24h 53m
        1 stop
        YOW 12:35
        Denver - Ottawa | Sat, Dec 13 | Frontier Airlines
        US$152 US$704
        78% OFF
        78% OFF
        US$704 US$152
      • DEN 10:40
        11h 18m
        1 stop
        YOW 23:58
        Denver - Ottawa | Tue, Feb 3 | Frontier Airlines
        US$169
        76% OFF
        US$704 US$169
      • DEN 11:42
        10h 58m
        1 stop
        YOW 00:40
        Denver - Ottawa | Sun, Feb 8 | United Airlines
        US$175
        75% OFF
        US$704 US$175
      • DEN 23:59
        21h 59m
        1 stop
        YOW 23:58
        Denver - Ottawa | Mon, Jan 5 | Frontier Airlines
        US$179
        75% OFF
        US$704 US$179
      • DEN 06:00
        9h 10m
        1 stop
        YOW 17:10
        Denver - Ottawa | Thu, Dec 18 | Frontier Airlines
        US$201
        71% OFF
        US$704 US$201
      • DEN 06:10
        13h 46m
        1 stop
        YOW 21:56
        Denver - Ottawa | Tue, Jan 6 | Frontier Airlines
        US$204
        71% OFF
        US$704 US$204
      • DEN 23:59
        15h 14m
        1 stop
        YOW 17:13
        Denver - Ottawa | Wed, Dec 24 | Frontier Airlines
        US$285
        59% OFF
        US$704 US$285
      • DEN 06:00
        13h 56m
        1 stop
        YOW 21:56
        Denver - Ottawa | Sun, Dec 14 | United Airlines
        US$633
        10% OFF
        US$704 US$633
      • DEN 13:00
        17h 25m
        1 stop
        YOW Invalid Date
        Denver - Ottawa | Sat, Dec 13 | Normal Airline
        Find More Flights
        Find More Flights

Displayed flight fares from Denver to Ottawa are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Denver to Ottawa Flight Details

The distance between Denver and Ottawa is about 2,435.76 km. Based on Trip.com's latest data, travel demand is highest in July. The off-season for travel is October.

Cheapest one-way flight priceUS$143
Cheapest return ticket priceUS$404
Cheapest monthOctober
Peak season for travelJuly
Flight distance2,435.76 km

When is the cheapest time to book flights from Denver to Ottawa?

The cheapest time to fly from Denver to Ottawa: Dec 14 to Dec 21 — one-way prices start at US$142.

Cheapest flights
From price
Search
  • 714
  • 1421
  • 2128

  • Jan

    284
  • 411
  • 1118
  • 1825

  • Feb

    251
  • 18
  • 815
  • 1522

  • Mar

    221
Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Frequently Asked Questions

  • What are the cheapest flights from Denver to Ottawa (DEN-YOW)?

    Based on Trip.com data, Frontier Airlines offers one-way fares as low as US$143 on Cheapest nonstop routes (e.g. DEN to YOW on Mon, Dec 15), while United Airlines offers Cheapest nonstop round-trips from US$404 departing on Tue, Dec 16 and returning on Tue, Dec 23.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Denver to Ottawa is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Denver to Ottawa, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, Dec 15, with one-way flights priced at just US$143.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Ottawa travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Denver to Ottawa is October, when demand for travel is lower.
  • After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Denver to Ottawa on December 16, 2025 with United Airlines, with prices starting at US$403.
  • The time difference between Ottawa and Denver is 2h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

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