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Cheap flights from Ottawa to Washington, D.C. Dulles Intl Airport from C$ 238

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 18/5. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — IAD
21 May — 28 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ottawa to Dulles Intl

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 21 April 2026.

Mon 1/611:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Mon 8/64:05 p.m.
IAD
-
YOW
1 stop5h 39m
Porter Airlines
Deal found 16/4C$ 426
Mon 11/511:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Wed 13/54:05 p.m.
IAD
-
YOW
1 stop3h 59m
Porter Airlines
Deal found 19/4C$ 427
Fri 8/511:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Mon 11/54:05 p.m.
IAD
-
YOW
1 stop3h 59m
Porter Airlines
Deal found 17/4C$ 429
Wed 27/511:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Sun 7/64:05 p.m.
IAD
-
YOW
1 stop5h 39m
Porter Airlines
Deal found 17/4C$ 430
Wed 20/511:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Wed 27/54:05 p.m.
IAD
-
YOW
1 stop5h 39m
Porter Airlines
Deal found 16/4C$ 433
Fri 8/511:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Sun 10/54:05 p.m.
IAD
-
YOW
1 stop5h 39m
Porter Airlines
Deal found 17/4C$ 434
Sun 31/511:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Fri 5/64:05 p.m.
IAD
-
YOW
1 stop3h 59m
Porter Airlines
Deal found 21/4C$ 436
Sun 31/511:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Wed 3/64:05 p.m.
IAD
-
YOW
1 stop5h 39m
Porter Airlines
Deal found 16/4C$ 438
Wed 27/57:00 a.m.
YOW
-
IAD
2 stops11h 42m
Multiple Airlines
Sun 7/65:30 p.m.
IAD
-
YOW
1 stop21h 45m
Multiple Airlines
Deal found 17/4C$ 440
Sun 17/511:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Sun 24/54:05 p.m.
IAD
-
YOW
1 stop3h 59m
Porter Airlines
Deal found 17/4C$ 449
Thu 21/511:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Sun 24/54:05 p.m.
IAD
-
YOW
1 stop5h 39m
Porter Airlines
Deal found 17/4C$ 451
Mon 15/611:00 a.m.
YOW
-
IAD
1 stop4h 21m
Porter Airlines
Mon 22/64:00 p.m.
IAD
-
YOW
1 stop4h 04m
Porter Airlines
Deal found 19/4C$ 463

Find 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 21 April 2026.

Round-trip from

C$ 426

One-way from

C$ 238

Popular in

August

Cheapest in

January

Average price

C$ 420

Good round-trip deal

C$ 572 or less

Good one-way deal

C$ 340 or less
Porter Airlines
  • Porter Airlines
  • 1/6-8/6
  • 2 total stops
  • 10h 00m total
  • Ottawa to Washington, D.C.
Search Deals
18/5
  • 18/5
  • 1 total stop
  • 25h 32m total
  • Ottawa to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (C$ 104 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
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 21 April 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Thu 28/5

3:10 p.m.-9:00 p.m.

1 stop5h 50m

Washington, D.C. Dulles Intl

Fri 29/5

8:18 a.m.-10:03 a.m.

Nonstop1h 45m

C$ 479

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Thu 16/7

11:00 a.m.-3:16 p.m.

1 stop4h 16m

Washington, D.C. Dulles Intl

Mon 20/7

11:30 a.m.-5:54 p.m.

1 stop6h 24m

C$ 530

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Sun 17/5

10:00 a.m.-11:50 a.m.

Nonstop1h 50m

Washington, D.C. Dulles Intl

Sun 24/5

10:10 p.m.-11:54 p.m.

Nonstop1h 44m

C$ 562

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Sun 10/5

10:00 a.m.-11:50 a.m.

Nonstop1h 50m

Washington, D.C. Dulles Intl

Thu 14/5

8:15 a.m.-10:03 a.m.

Nonstop1h 48m

C$ 562
Quickest round-trip

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Tue 9/6

7:30 p.m.-9:13 p.m.

Nonstop1h 43m

Washington, D.C. Dulles Intl

Sun 14/6

10:10 p.m.-11:54 p.m.

Nonstop1h 44m

C$ 564

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Thu 21/5

2:52 p.m.-4:35 p.m.

Nonstop1h 43m

Washington, D.C. Dulles Intl

Sun 24/5

10:10 p.m.-11:54 p.m.

Nonstop1h 44m

C$ 564

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Sat 23/5

2:52 p.m.-4:35 p.m.

Nonstop1h 43m

Washington, D.C. Dulles Intl

Sat 30/5

8:18 a.m.-10:03 a.m.

Nonstop1h 45m

C$ 564

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 22/5

7:30 p.m.-9:13 p.m.

Nonstop1h 43m

Washington, D.C. Dulles Intl

Mon 25/5

5:42 p.m.-10:05 p.m.

1 stop4h 23m

C$ 578

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Wed 20/5

7:30 p.m.-9:18 p.m.

Nonstop1h 48m

Washington, D.C. Dulles Intl

Wed 27/5

5:42 p.m.-10:05 p.m.

1 stop4h 23m

C$ 582
Cheapest one-way

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Mon 1/6

11:00 a.m.-3:21 p.m.

1 stop4h 21m

C$ 250

Flights are sorted by cheapest round-trip flights first.

Deals found on 17/4

Showing 1-10 of 19 resultsSorted by cheapest first
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

What is the cheapest month to book a flight from Ottawa to Washington, D.C. Dulles Intl Airport?

Currently, January is the cheapest month in which you can book a flight from Ottawa to Washington, D.C. Dulles Intl Airport (average of C$ 418). Flying from Ottawa to Washington, D.C. Dulles Intl Airport in August is currently the most expensive (average of C$ 721). 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 21 April 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ottawa to Washington, D.C. Dulles Intl Airport as you normally would.

How much does it cost to fly round-trip from Ottawa to Washington, D.C. Dulles Intl Airport?

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 21 April 2026.
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
435 reviews
Check prices

Boarding

8.2

Entertainment

7.0

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Porter Airlines
8.0
Very good
435 reviews
Porter Airlines
8.0
Very good
435 reviews
Check prices

Boarding

8.2

Entertainment

7.0

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
United Airlines
7.4
Good
9,613 reviews
Porter Airlines
8.0
Very good
435 reviews
Check prices

Boarding

8.2

Entertainment

7.0

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Air Canada
7.1
Good
10,947 reviews
Porter Airlines
8.0
Very good
435 reviews
Check prices

Boarding

8.2

Entertainment

7.0

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.

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 7 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 4h 16m. There are 723 km between Ottawa and Washington, D.C. Dulles Intl Airport. Both multi-stop and direct 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?

    According to our current data, Porter Airlines (C$ 328), United Airlines (C$ 354), and Air Canada (C$ 478) offers the cheapest pricing from Ottawa to Washington, D.C. Dulles Intl Airport. These flights start at 39% 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: Republic Airways (89%), Air Canada (84%), Avianca (82%).

  • 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$ 276. While the most popular route (Ottawa - Washington, D.C. Dulles Intl) can be booked for C$ 427 on average, our data indicates C$ 635 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, January is the cheapest month in which you can book a flight from Ottawa to Washington, D.C. Dulles Intl Airport (average of C$ 418). Flying from Ottawa to Washington, D.C. Dulles Intl Airport in August is currently the most expensive (average of C$ 721). 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
Silver Spring
Warrenton
Winchester
Hanover
Fairfax
Reston
Ellicott City
Oxon Hill
Gaithersburg
Arlington
Herndon
Manassas
Fredericksburg
Alexandria
Rockville

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 629,999 searches. Data last updated 21 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 328AverageC$ 415FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 354AverageC$ 580FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 478AverageC$ 634FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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