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Cheap flights from Ottawa to Washington, D.C. Dulles Intl Airport from C$ 209

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 12/12. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — IAD
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

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 Friday or Tuesday and return on a Tuesday

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Enter your travel dates to find the best prices.

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 30 October 2025.

Wed 26/116:50 a.m.YOW - IAD
1 stop3h 34mPorter Airlines
Fri 28/1111:40 a.m.IAD - YOW
1 stop3h 24mPorter Airlines
Deal found 29/10C$ 402
Mon 22/1212:10 p.m.YOW - IAD
1 stop5h 04mPorter Airlines
Sun 28/1211:40 a.m.IAD - YOW
1 stop3h 24mPorter Airlines
Deal found 28/10C$ 406
Thu 13/1112:10 p.m.YOW - IAD
1 stop5h 04mPorter Airlines
Sun 16/116:30 p.m.IAD - YOW
1 stop3h 59mPorter Airlines
Deal found 29/10C$ 409
Fri 14/1112:10 p.m.YOW - IAD
1 stop5h 04mPorter Airlines
Mon 17/116:30 p.m.IAD - YOW
1 stop3h 59mPorter Airlines
Deal found 29/10C$ 418
Sat 13/128:40 a.m.YOW - IAD
1 stop3h 49mPorter Airlines
Sat 20/126:30 p.m.IAD - YOW
1 stop3h 59mPorter Airlines
Deal found 29/10C$ 437
Wed 24/126:50 a.m.YOW - IAD
1 stop3h 34mPorter Airlines
Thu 25/122:30 p.m.IAD - YOW
1 stop4h 29mPorter Airlines
Deal found 28/10C$ 447
Mon 17/114:15 p.m.YOW - IAD
2 stops28h 05mMultiple Airlines
Thu 20/116:30 p.m.IAD - YOW
1 stop3h 59mMultiple Airlines
Deal found 29/10C$ 454
Fri 28/1112:10 p.m.YOW - IAD
1 stop5h 04mPorter Airlines
Sun 30/116:30 p.m.IAD - YOW
1 stop3h 59mPorter Airlines
Deal found 30/10C$ 455
Sun 16/115:40 a.m.YOW - IAD
2 stops38h 12mMultiple Airlines
Wed 19/116:30 p.m.IAD - YOW
1 stop3h 59mMultiple Airlines
Deal found 29/10C$ 462
Mon 17/112:05 p.m.YOW - IAD
1 stop6h 21mAir Canada
Thu 20/119:00 a.m.IAD - YOW
1 stop6h 23mAir Canada
Deal found 30/10C$ 464
Fri 5/121:20 p.m.YOW - IAD
1 stop3h 54mMultiple Airlines
Mon 8/126:58 p.m.IAD - YOW
2 stops17h 37mMultiple Airlines
Deal found 29/10C$ 473
Thu 27/1112:10 p.m.YOW - IAD
1 stop5h 04mMultiple Airlines
Sat 6/129:20 p.m.IAD - YOW
2 stops24h 34mMultiple Airlines
Deal found 30/10C$ 475

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 30 October 2025.

Round-trip from

C$ 402

One-way from

C$ 209

Popular in

August

Cheapest in

April

Average price

C$ 575

Good round-trip deal

C$ 549 or less

Good one-way deal

C$ 349 or less
United Airlines
  • United Airlines
  • 19/11-20/11
  • 1 total stop
  • 6h 39m total
  • Ottawa to Washington, D.C.
Search Deals
Porter Airlines
  • Porter Airlines
  • 12/12
  • 1 total stop
  • 5h 04m total
  • Ottawa to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 96 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 23 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 629,999 searches. Data last updated 30 October 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

Wed 26/11

6:50 a.m.-10:24 a.m.

1 stop3h 34m

Washington, D.C. Dulles Intl

Fri 28/11

11:40 a.m.-3:04 p.m.

1 stop3h 24m

C$ 402

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 14/11

12:10 p.m.-5:14 p.m.

1 stop5h 04m

Washington, D.C. Dulles Intl

Mon 17/11

6:30 p.m.-10:29 p.m.

1 stop3h 59m

C$ 418

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Mon 26/1

7:00 a.m.-10:24 a.m.

1 stop3h 24m

Washington, D.C. Dulles Intl

Thu 5/2

11:40 a.m.-5:29 p.m.

1 stop5h 49m

C$ 434

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Wed 25/2

7:00 a.m.-10:24 a.m.

1 stop3h 24m

Washington, D.C. Dulles Intl

Thu 26/2

11:40 a.m.-3:04 p.m.

1 stop3h 24m

C$ 434

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Wed 24/12

6:50 a.m.-10:24 a.m.

1 stop3h 34m

Washington, D.C. Dulles Intl

Thu 25/12

2:30 p.m.-6:59 p.m.

1 stop4h 29m

C$ 447

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Sat 3/1

12:10 p.m.-5:14 p.m.

1 stop5h 04m

Washington, D.C. Dulles Intl

Thu 8/1

11:40 a.m.-5:29 p.m.

1 stop5h 49m

C$ 450

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 16/1

2:15 p.m.-4:13 p.m.

Nonstop1h 58m

Washington, D.C. Dulles Intl

Mon 19/1

9:45 a.m.-4:18 p.m.

1 stop6h 33m

C$ 455

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Sun 16/11

5:40 a.m.-7:52 p.m.

2 stops38h 12m

Washington, D.C. Dulles Intl

Wed 19/11

6:30 p.m.-10:29 p.m.

1 stop3h 59m

C$ 462

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Tue 23/12

6:50 a.m.-10:24 a.m.

1 stop3h 34m

C$ 215

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Mon 26/1

7:00 a.m.-10:24 a.m.

1 stop3h 24m

C$ 233

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/10

Showing 1-10 of 18 results
1
2

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 24 October 2025.

The best time to book flights from Ottawa to Washington, D.C. Dulles Intl Airport is 58 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 C$ 221). Flying from Ottawa to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of C$ 388). 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 30 October 2025.

A simple way to save on the total cost of your ticket is to fly from Ottawa to Washington, D.C. Dulles Intl Airport in the afternoon. If you’re flexible enough to do this you can expect to save up to 60% on your trip compared to booking a flight at noon.

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 30 October 2025.
See what other customers who have flown with Porter Airlines,United Airlines, andAir Canada from Ottawa to Washington, D.C. Dulles Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
384 reviews
Check prices

Overall

8.0

Entertainment

7.0

Boarding

8.2

Food

7.6

Crew

8.6

Comfort

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
384 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Overall

8.0

Entertainment

7.0

Boarding

8.2

Food

7.6

Crew

8.6

Comfort

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
8,998 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Overall

8.0

Entertainment

7.0

Boarding

8.2

Food

7.6

Crew

8.6

Comfort

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
10,376 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Overall

8.0

Entertainment

7.0

Boarding

8.2

Food

7.6

Crew

8.6

Comfort

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) is the airport you will fly out of if you book a flight from Ottawa to Washington, D.C. Dulles Intl. You should not have trouble finding flights to Washington, D.C. Dulles Intl from Ottawa; the airport handles an average of 3 outbound flights to Washington, D.C. Dulles Intl per day. You should also have plenty of airline options to choose from since 3 airlines have flights from the Ottawa airport to Washington, D.C. Dulles Intl. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.

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

    Departing from Ottawa to Washington, D.C. Dulles Intl Airport will take you 3h 34m. There are 723 km between Ottawa and Washington, D.C. Dulles Intl Airport.

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

    According to our current data, Porter Airlines (C$ 357), Air Canada (C$ 370), and United Airlines (C$ 456) offers the cheapest pricing from Ottawa to Washington, D.C. Dulles Intl Airport. These flights start at 37% 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?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Ottawa to Washington, D.C. Dulles Intl Airport on time: GoJet (76%), Air Canada (76%), United Airlines (76%).

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

    Looking at all options, your cheapest flight can be booked for C$ 243. While the most popular route (Ottawa - Washington, D.C. Dulles Intl) can be booked for C$ 341 on average, our data indicates C$ 682 when flying from Ottawa to Washington, D.C. Dulles Intl Airport.

  • 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 C$ 221). Flying from Ottawa to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of C$ 388). 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 Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Warrenton
Hanover
Fairfax
Reston
Ellicott City
Oxon Hill
Gaithersburg
Herndon
Arlington
Winchester
Manassas
Fredericksburg
Alexandria
Rockville

Browse thousands of different options on Cheapflights for your next trip

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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 629,999 searches. Data last updated 30 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 357AverageC$ 437FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 370AverageC$ 592FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 456AverageC$ 687FlexibilityNo cancel feeOn-time69%
Search United Airlines 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 Dulles Intl?

Cheapflights makes it easy to find Ottawa to Dulles Intl flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Dulles Intl?

Cheapflights helps you find that perfect flight to Dulles Intl from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ottawa to Dulles Intl with no change fees?

Yes! Cheapflights helps users easily find flights from Ottawa to Dulles Intl with no change fees.

Can Cheapflights notify me if prices for flights from Ottawa to Dulles Intl become cheaper?

Yes! Start tracking prices for Ottawa to Dulles Intl flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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