HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dulles Intl

$159+ Cheap flights from Ottawa (YOW) to Dulles Intl (IAD)

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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — IAD
Nov 13 — Nov 201
Thu 11/13
Thu 11/20
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ottawa to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Ottawa to Washington, D.C. Dulles Intl are usually found in April or July, booked 61 days in advance, depart on a Wednesday or Saturday and return on a Saturday

Find flight deals from Ottawa to Dulles Intl

Cheapest flights from Ottawa to Dulles Intl
Explore the most affordable flight options available from Ottawa to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 14, 2025.

This United Airlines deal was found by Cheapflights users on 10/14. 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 11/147:30 pmYOW - IAD
Nonstop1h 52mUnited Airlines
Sat 11/158:45 amIAD - YOW
1 stop4h 47mUnited Airlines
Deal found 10/14$272
This Trip.com deal was found by Cheapflights users on 10/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1012:10 pmYOW - IAD
1 stop5h 04mPorter Airlines
Fri 11/1411:40 amIAD - YOW
1 stop5h 49mPorter Airlines
Deal found 10/14$290
This Trip.com deal was found by Cheapflights users on 10/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/66:50 amYOW - IAD
1 stop3h 34mPorter Airlines
Mon 11/1011:40 amIAD - YOW
1 stop3h 24mPorter Airlines
Deal found 10/12$291
This Trip.com deal was found by Cheapflights users on 10/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/76:50 amYOW - IAD
1 stop3h 34mPorter Airlines
Mon 11/106:30 pmIAD - YOW
1 stop3h 59mPorter Airlines
Deal found 10/14$292
This Trip.com deal was found by Cheapflights users on 10/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/612:10 pmYOW - IAD
1 stop5h 04mPorter Airlines
Sun 11/911:40 amIAD - YOW
1 stop5h 49mPorter Airlines
Deal found 10/13$295
This Trip.com deal was found by Cheapflights users on 10/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/191:20 pmYOW - IAD
1 stop3h 54mPorter Airlines
Sun 12/2111:40 amIAD - YOW
1 stop5h 49mPorter Airlines
Deal found 10/13$310
This Trip.com deal was found by Cheapflights users on 10/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/271:20 pmYOW - IAD
1 stop3h 54mPorter Airlines
Tue 12/3011:40 amIAD - YOW
1 stop3h 24mPorter Airlines
Deal found 10/14$312
This Trip.com deal was found by Cheapflights users on 10/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/286:50 amYOW - IAD
1 stop3h 34mPorter Airlines
Fri 12/511:40 amIAD - YOW
1 stop8h 14mPorter Airlines
Deal found 10/14$315
This Kiwi.com deal was found by Cheapflights users on 10/14. 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 11/511:40 amYOW - IAD
1 stop5h 34mPorter Airlines
Fri 11/2811:40 amIAD - YOW
1 stop3h 24mPorter Airlines
Deal found 10/14$320
This Kiwi.com deal was found by Cheapflights users on 10/14. 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.
Fri 11/71:20 pmYOW - IAD
1 stop3h 54mMultiple Airlines
Mon 11/108:36 pmIAD - YOW
2 stops28h 06mMultiple Airlines
Deal found 10/14$324

Cheap flight deals from Ottawa to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to Dulles Intl (IAD). 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 October 14, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$272
(United Airlines)

One-way from

$159
(Kiwi.com)

Popular in

August

Cheapest in

April

Average price

$412

Good round-trip deal

$409 or less

Good one-way deal

$329 or less
Provider with most accurate pricing for Ottawa-Washington, D.C. Dulles Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ottawa-Washington, D.C. Dulles Intl flights.
Search Deals
From Ottawa to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Ottawa to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($49 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Ottawa to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Ottawa to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ottawa to Dulles Intl 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 October 14, 2025.
Use the filters below to find and compare flights from Ottawa to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Ottawa

Fly to

Dulles Intl

Route

Depart

Return

Price

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 11/7

12:10 pm-5:14 pm

1 stop5h 04m

Washington, D.C. Dulles Intl

Mon 11/10

11:40 am-3:04 pm

1 stop3h 24m

$291

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 11/14

7:30 pm-9:22 pm

Nonstop1h 52m

Washington, D.C. Dulles Intl

Sat 11/15

8:20 am-4:32 pm

2 stops8h 12m

$295

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Thu 11/6

12:10 pm-5:14 pm

1 stop5h 04m

Washington, D.C. Dulles Intl

Sun 11/9

11:40 am-5:29 pm

1 stop5h 49m

$295

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 12/19

1:20 pm-5:14 pm

1 stop3h 54m

Washington, D.C. Dulles Intl

Sun 12/21

11:40 am-5:29 pm

1 stop5h 49m

$310

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Wed 11/5

2:15 pm-4:09 pm

Nonstop1h 54m

Washington, D.C. Dulles Intl

Wed 11/26

10:12 pm-11:54 pm

Nonstop1h 42m

$337

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Thu 11/6

2:15 pm-4:09 pm

Nonstop1h 54m

Washington, D.C. Dulles Intl

Sun 11/9

10:12 pm-11:54 pm

Nonstop1h 42m

$354

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Sun 11/9

9:45 am-11:39 am

Nonstop1h 54m

Washington, D.C. Dulles Intl

Sun 11/9

10:12 pm-11:54 pm

Nonstop1h 42m

$355

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 11/7

9:45 am-11:39 am

Nonstop1h 54m

Washington, D.C. Dulles Intl

Mon 11/10

10:35 pm-10:26 am

1 stop11h 51m

$355

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Tue 11/11

2:15 pm-4:09 pm

Nonstop1h 54m

Washington, D.C. Dulles Intl

Tue 11/11

10:35 pm-10:26 am

1 stop11h 51m

$355

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Mon 11/10

7:30 pm-9:22 pm

Nonstop1h 52m

Washington, D.C. Dulles Intl

Mon 11/17

10:35 pm-10:26 am

1 stop11h 51m

$355

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/13

Showing 1-10 of 18 results
1
2

Compare providers for flights from Ottawa to Dulles Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ottawa to Dulles Intl in October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ottawa-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ottawa-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ottawa-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ottawa-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ottawa-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ottawa to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl 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 Washington, D.C. Dulles Intl Airport

How far ahead should I book a flight from Ottawa to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from Ottawa to Dulles Intl. Price data was last updated on October 10, 2025.

The price you pay for your flight from Ottawa to Washington, D.C. Dulles Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 58 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 Washington, D.C. Dulles Intl Airport?

Currently, March is the cheapest month in which you can book a flight from Ottawa to Washington, D.C. Dulles Intl Airport (average of $158). Flying from Ottawa to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of $277). 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 IAD?

Find hourly flight availability from Ottawa to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 14, 2025.

One of the essential ways to save on airfare from Ottawa to Washington, D.C. Dulles Intl Airport is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 15% on airfare.

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated October 14, 2025.
Get a feel of what it's like to fly with Porter Airlines, United Airlines, and Air Canada from Ottawa to Washington, D.C. Dulles Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
379 reviews

Food

7.6

Crew

8.6

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
8.0
Very good
379 reviews
Porter Airlines
8.0
Very good
379 reviews

Food

7.6

Crew

8.6

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,977 reviews
Porter Airlines
8.0
Very good
379 reviews

Food

7.6

Crew

8.6

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,298 reviews
Porter Airlines
8.0
Very good
379 reviews

Food

7.6

Crew

8.6

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ottawa to Washington, D.C. Dulles Intl?

    Ottawa (YOW), located 6.6 mi from the city center, is the airport you fly out of when you book flights from Ottawa to Washington, D.C. Dulles Intl. 3 airlines have flights from Ottawa to Washington, D.C. Dulles Intl on a regular basis. Booking flights from Ottawa to Washington, D.C. Dulles Intl should not be difficult; the airport handles an average of 6 outbound flights to Washington, D.C. Dulles Intl per day.

  • How long is the flight from Ottawa to Washington, D.C. Dulles Intl Airport?

    Porter Airlines and United Airlines can get you from Ottawa to Washington, D.C. Dulles Intl Airport in just under 1h 52m. Your travel time can differ by up to 3h 12m. Ottawa and Washington, D.C. Dulles Intl Airport are separated by a distance of 449 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Ottawa to Washington, D.C. Dulles Intl Airport round-trip?

    Porter Airlines, at $197, was found to be the cheapest airline from Ottawa to Washington, D.C. Dulles Intl Airport.Alternate airlines to your destination round-trip include United Airlines and Air Canada. These flights start at 51% lower than the current average price 3 months from now.

  • What are the most reliable airlines from Ottawa to Washington, D.C. Dulles Intl Airport?

    Consider Avianca (100%), GoJet (77%) or Air Canada (77%) when booking your flight. These represent the most reliable airlines when flying from Ottawa to Washington, D.C. Dulles Intl Airport.

  • What are the cheapest flights from Ottawa to Washington, D.C. Dulles Intl Airport?

    On average you can expect to pay $522 for a flight from Ottawa to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $202 while the most popular route, (Ottawa - Washington, D.C. Dulles Intl) is currently priced at $291.

  • Can I find deals for flights from Ottawa to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Ottawa to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Dulles Intl.

  • Can I find deals for business class flights from Ottawa to Dulles Intl?

    Yes. Cheapflights offers flight deals from Ottawa to Dulles Intl 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 Washington, D.C. Dulles Intl Airport?

    Currently, March is the cheapest month in which you can book a flight from Ottawa to Washington, D.C. Dulles Intl Airport (average of $158). Flying from Ottawa to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of $277). 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 Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Woodbridge
Arlington
Tysons
Springfield
Silver Spring
Hanover
Gaithersburg
Fredericksburg
Fairfax
Linthicum Heights
Falls Church
Owings Mills
Manassas
Largo
Oxon Hill
Laurel
Towson
National Harbor
Waldorf

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 3 airlines flying from Ottawa to Dulles Intl

Discover the top 3 airlines that operate flights from Ottawa to Dulles Intl. 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 October 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapest$197Average$307FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$281Average$465FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$312Average$470FlexibilityNo cancel feeOn-time67%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.