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Cheap flights from Ottawa to Washington, D.C. Dulles Intl Airport from C$ 234

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 31/10. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — IAD
17 Oct — 24 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Ottawa to Washington, D.C. Dulles Intl are usually found in April or July, booked 60 days in advance, depart on a Friday or Tuesday and return on a Wednesday

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 17 September 2025.

Round-trip from

C$ 433

One-way from

C$ 234

Popular in

August

Cheapest in

April

Average price

C$ 671

Good round-trip deal

C$ 701 or less

Good one-way deal

C$ 358 or less
Porter Airlines
  • Porter Airlines
  • 26/12-31/12
  • 2 total stops
  • 9h 23m total
  • Ottawa to Washington, D.C.
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Porter Airlines
  • Porter Airlines
  • 31/10
  • 1 total stop
  • 5h 04m total
  • Ottawa to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (C$ 83 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 24 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Ottawa to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from Ottawa to Washington, D.C. Dulles Intl.
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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 17 September 2025.

Fri 26/1212:10 p.m.YOW - IAD
1 stop5h 04mPorter Airlines
Tue 30/126:30 p.m.IAD - YOW
1 stop3h 59mPorter Airlines
Deal found 15/9C$ 433
Thu 30/108:40 a.m.YOW - IAD
1 stop8h 34mPorter Airlines
Thu 6/1111:40 a.m.IAD - YOW
1 stop5h 49mPorter Airlines
Deal found 15/9C$ 440
Fri 10/107:00 a.m.YOW - IAD
1 stop3h 16mPorter Airlines
Sun 12/104:20 p.m.IAD - YOW
1 stop3h 39mPorter Airlines
Deal found 16/9C$ 442
Mon 6/108:35 a.m.YOW - IAD
1 stop6h 31mPorter Airlines
Wed 8/104:20 p.m.IAD - YOW
1 stop4h 14mPorter Airlines
Deal found 15/9C$ 443
Fri 17/108:35 a.m.YOW - IAD
1 stop6h 31mPorter Airlines
Sun 19/1011:35 a.m.IAD - YOW
1 stop4h 59mPorter Airlines
Deal found 15/9C$ 454
Wed 15/105:55 a.m.YOW - IAD
1 stop9h 11mMultiple Airlines
Mon 27/1011:40 a.m.IAD - YOW
1 stop13h 02mMultiple Airlines
Deal found 16/9C$ 455
Fri 10/107:00 a.m.YOW - IAD
1 stop3h 16mPorter Airlines
Tue 14/104:20 p.m.IAD - YOW
1 stop4h 14mPorter Airlines
Deal found 16/9C$ 462
Wed 8/109:35 a.m.YOW - IAD
1 stop5h 31mPorter Airlines
Fri 10/104:20 p.m.IAD - YOW
1 stop4h 14mPorter Airlines
Deal found 17/9C$ 468
Fri 10/107:00 a.m.YOW - IAD
1 stop3h 16mPorter Airlines
Mon 13/1011:35 a.m.IAD - YOW
1 stop4h 59mPorter Airlines
Deal found 16/9C$ 469
Thu 30/102:15 p.m.YOW - IAD
Nonstop1h 54mMultiple Airlines
Fri 31/109:45 a.m.IAD - YOW
1 stop4h 23mMultiple Airlines
Deal found 15/9C$ 475

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 17 September 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

Mon 22/12

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

1 stop5h 04m

Washington, D.C. Dulles Intl

Fri 2/1

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

1 stop3h 59m

C$ 433

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 23/1

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

1 stop3h 34m

Washington, D.C. Dulles Intl

Sun 25/1

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

1 stop3h 59m

C$ 433

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 10/10

7:00 a.m.-10:16 a.m.

1 stop3h 16m

Washington, D.C. Dulles Intl

Sun 12/10

4:20 p.m.-7:59 p.m.

1 stop3h 39m

C$ 442

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Thu 30/10

9:30 a.m.-6:27 p.m.

1 stop8h 57m

Washington, D.C. Dulles Intl

Thu 6/11

9:52 p.m.-12:42 a.m.

2 stops26h 50m

C$ 454

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 17/10

8:35 a.m.-3:06 p.m.

1 stop6h 31m

Washington, D.C. Dulles Intl

Sun 19/10

11:35 a.m.-4:34 p.m.

1 stop4h 59m

C$ 454

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Mon 27/10

9:30 a.m.-9:38 p.m.

1 stop12h 08m

Washington, D.C. Dulles Intl

Thu 30/10

6:30 p.m.-6:39 p.m.

1 stop24h 09m

C$ 462

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Wed 8/10

9:35 a.m.-3:06 p.m.

1 stop5h 31m

Washington, D.C. Dulles Intl

Fri 10/10

4:20 p.m.-8:34 p.m.

1 stop4h 14m

C$ 468

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 17/10

7:29 p.m.-9:12 p.m.

Nonstop1h 43m

Washington, D.C. Dulles Intl

Fri 24/10

8:16 a.m.-9:58 a.m.

Nonstop1h 42m

C$ 469

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Thu 30/10

2:15 p.m.-4:09 p.m.

Nonstop1h 54m

Washington, D.C. Dulles Intl

Fri 31/10

9:45 a.m.-2:08 p.m.

1 stop4h 23m

C$ 475

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Sat 11/10

7:29 p.m.-9:12 p.m.

Nonstop1h 43m

Washington, D.C. Dulles Intl

Sat 18/10

5:12 p.m.-10:05 p.m.

1 stop4h 53m

C$ 480

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/9

Showing 1-10 of 20 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 12 September 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, February is the cheapest month in which you can book a flight from Ottawa to Washington, D.C. Dulles Intl Airport (average of C$ 256). Flying from Ottawa to Washington, D.C. Dulles Intl Airport in October is currently the most expensive (average of C$ 352). 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 17 September 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 61% 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 17 September 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
7.9
Good
365 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

7.9

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
7.9
Good
365 reviews
Porter Airlines
7.9
Good
365 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

7.9

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
8,926 reviews
Porter Airlines
7.9
Good
365 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

7.9

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
10,000 reviews
Porter Airlines
7.9
Good
365 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

7.9

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 6 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 5h 04m. 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$ 352), Air Canada (C$ 365), and United Airlines (C$ 449) offers the cheapest pricing from Ottawa to Washington, D.C. Dulles Intl Airport. These flights start at 36% 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 (74%), Air Canada (74%), United Airlines (74%).

  • 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$ 239. While the most popular route (Ottawa - Washington, D.C. Dulles Intl) can be booked for C$ 382 on average, our data indicates C$ 1,109 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, February is the cheapest month in which you can book a flight from Ottawa to Washington, D.C. Dulles Intl Airport (average of C$ 256). Flying from Ottawa to Washington, D.C. Dulles Intl Airport in October is currently the most expensive (average of C$ 352). 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
Herndon
Warrenton
Hanover
Reston
Fairfax
Ellicott City
Oxon Hill
Gaithersburg
Winchester
Arlington
Alexandria
Manassas
Fredericksburg
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 17 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 352AverageC$ 436FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 365AverageC$ 572FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 449AverageC$ 677FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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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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