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Denver

$163+ 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 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — DEN
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Ottawa to Denver Intl are usually found in September or November, booked 45 days in advance, depart on a Tuesday or Friday and return on a Wednesday

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 September 11, 2025.

Round-trip from

$268
(United Airlines)

One-way from

$163
(United Airlines)

Popular in

May

Cheapest in

September

Average price

$313
From Ottawa to Denver Intl
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One-way flight from Ottawa to Denver Intl
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Highest demand for flights based on searches. 9% potential increase in price ($45 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/10. 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.
Wed 10/155:50 pmYOW - DEN
1 stop7h 25mUnited Airlines
Sat 10/257:48 amDEN - YOW
1 stop7h 18mUnited Airlines
Deal found 9/10$268
This Air Canada deal was found by Cheapflights users on 9/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/98:35 amYOW - DEN
1 stop9h 54mAir Canada
Mon 10/136:05 pmDEN - YOW
1 stop12h 18mAir Canada
Deal found 9/11$328
This Air Canada deal was found by Cheapflights users on 9/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/25:15 amYOW - DEN
1 stop8h 43mAir Canada
Sun 10/55:36 pmDEN - YOW
1 stop5h 58mAir Canada
Deal found 9/11$333
This United deal was found by Cheapflights users on 9/9. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/175:25 pmYOW - DEN
1 stop8h 05mMultiple Airlines
Mon 10/205:30 pmDEN - YOW
1 stop6h 04mMultiple Airlines
Deal found 9/9$358
This Air Canada deal was found by Cheapflights users on 9/9. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/205:25 pmYOW - DEN
1 stop17h 28mAir Canada
Sat 12/277:05 pmDEN - YOW
1 stop9h 38mAir Canada
Deal found 9/9$387
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Thu 10/25:25 pmYOW - DEN
1 stop8h 05mUnited Airlines
Sun 10/56:00 amDEN - YOW
2 stops13h 09mUnited Airlines
Deal found 9/11$420
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Wed 10/157:00 amYOW - DEN
2 stops18h 16mMultiple Airlines
Fri 10/2412:36 amDEN - YOW
1 stop14h 21mMultiple Airlines
Deal found 9/10$444
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Fri 10/175:15 amYOW - DEN
2 stops13h 20mUnited Airlines
Mon 10/2011:59 pmDEN - YOW
2 stops13h 05mUnited Airlines
Deal found 9/9$489

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 September 11, 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

Wed 10/15

5:50 pm-11:15 pm

1 stop7h 25m

Denver Intl

Sat 10/25

7:48 am-5:06 pm

1 stop7h 18m

$268

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 3/3

7:45 am-5:44 pm

1 stop11h 59m

Denver Intl

Wed 3/4

11:15 am-7:22 pm

1 stop6h 07m

$311

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Fri 10/17

5:25 pm-6:42 am

1 stop15h 17m

Denver Intl

Mon 10/20

11:59 pm-1:09 pm

2 stops11h 10m

$333

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Fri 10/17

5:25 pm-11:30 pm

1 stop8h 05m

Denver Intl

Mon 10/20

5:30 pm-1:34 am

1 stop6h 04m

$358

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 10/2

5:25 pm-11:30 pm

1 stop8h 05m

Denver Intl

Sun 10/5

6:00 am-9:09 pm

2 stops13h 09m

$420

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 10/15

7:00 am-11:16 pm

2 stops18h 16m

Denver Intl

Fri 10/24

12:36 am-4:57 pm

1 stop14h 21m

$444

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 12/20

6:00 am-3:45 pm

2 stops11h 45m

Denver Intl

Sat 12/27

7:05 pm-6:43 am

1 stop9h 38m

$496

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 12/20

6:00 am-3:45 pm

2 stops11h 45m

Denver Intl

Sun 12/28

7:05 pm-6:43 am

1 stop9h 38m

$496

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 10/9

6:25 am-4:03 pm

2 stops11h 38m

Denver Intl

Mon 10/13

6:05 pm-8:23 am

1 stop12h 18m

$512

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 10/18

5:25 pm-6:42 am

1 stop15h 17m

$163

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 17 results
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

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 August 29, 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 45 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, October is the cheapest month in which you can book a flight from Ottawa to Denver (average of $197). Flying from Ottawa to Denver in March is currently the most expensive (average of $278). 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 September 11, 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 38% on your trip compared to booking a flight at noon.

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 September 11, 2025.
See what other customers who have flown with 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.
Air Canada
7.1
Good
10,000 reviews

Boarding

7.3

Entertainment

6.8

Comfort

7.1

Food

6.3

Crew

7.8

Overall

7.1

Reviews

1 / 20
10.0
Excellent

janet,Sep 2025

YOW - YYZ

Really appreciated the leg room despite purchasing an economy ticket. Appreciated the extra complimentary wine. Nice touch. Was given immediate support without asking at check in, at the machine!! Ottawa's boarding was very organized with distinct rows in waiting room. Allowed for the main hall to not be blocked by people waiting to board.
Air Canada
7.1
Good
10,000 reviews
Air Canada
7.1
Good
10,000 reviews

Boarding

7.3

Entertainment

6.8

Comfort

7.1

Food

6.3

Crew

7.8

Overall

7.1

Reviews

1 / 20
10.0
Excellent

janet,Sep 2025

YOW - YYZ

Really appreciated the leg room despite purchasing an economy ticket. Appreciated the extra complimentary wine. Nice touch. Was given immediate support without asking at check in, at the machine!! Ottawa's boarding was very organized with distinct rows in waiting room. Allowed for the main hall to not be blocked by people waiting to board.

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?

    For as low as $268, United Airlines can have you in Denver from Ottawa in 7h 25m. The distance between Ottawa and Denver is about 1513 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Ottawa to Denver round-trip?

    Flying on Air Canada is currently your cheapest option to Denver, with prices starting at $254. Air Canada is priced at 44% 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, October is the cheapest month in which you can book a flight from Ottawa to Denver (average of $197). Flying from Ottawa to Denver in March is currently the most expensive (average of $278). 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
Westminster
Black Hawk
Golden
Winter Park
Broomfield
Greeley
Lone Tree
Lakewood
Cripple Creek
Thornton
Silverthorne
Frisco
Manitou Springs
Fort Morgan
Glendale
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top airline flying from Ottawa to Denver

Discover the top airline 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$254Average$466FlexibilityNo cancel feeOn-time67%

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