HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dulles Intl

$142+ 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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — IAD
Jul 21 — Jul 281
Mon 7/21
Mon 7/28
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 March, booked 59 days in advance, depart on a Wednesday or Friday and return on a Saturday

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 July 16, 2025.

Round-trip from

$268
(Mytrip)

One-way from

$142
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$344

Good round-trip deal

$281 or less

Good one-way deal

$265 or less
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 ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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

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 July 16, 2025.

This Mytrip deal was found by Cheapflights users on 7/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/289:35 amYOW - IAD
1 stop5h 21mPorter Airlines
Fri 8/14:10 pmIAD - YOW
1 stop4h 53mPorter Airlines
Deal found 7/13$268
This Air Canada deal was found by Cheapflights users on 7/14. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/32:40 pmYOW - IAD
1 stop6h 25mAir Canada
Wed 9/1010:20 amIAD - YOW
1 stop4h 44mAir Canada
Deal found 7/14$280
This United Airlines deal was found by Cheapflights users on 7/16. 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 8/67:29 pmYOW - IAD
Nonstop1h 35mUnited Airlines
Tue 8/1212:31 pmIAD - YOW
Nonstop1h 42mUnited Airlines
Deal found 7/16$307
This Flightnetwork deal was found by Cheapflights users on 7/14. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/49:50 amYOW - IAD
Nonstop1h 43mMultiple Airlines
Sun 9/74:20 pmIAD - YOW
1 stop3h 39mMultiple Airlines
Deal found 7/14$314
This AOBTravel deal was found by Cheapflights users on 7/15. 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 AOBTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/307:29 pmYOW - IAD
Nonstop1h 43mLufthansa
Sat 9/612:35 pmIAD - YOW
Nonstop1h 38mLufthansa
Deal found 7/15$315

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 July 16, 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 7/28

9:35 am-2:56 pm

1 stop5h 21m

Washington, D.C. Dulles Intl

Fri 8/1

4:10 pm-9:03 pm

1 stop4h 53m

$268

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Wed 9/3

2:40 pm-9:05 pm

1 stop6h 25m

Washington, D.C. Dulles Intl

Wed 9/10

10:20 am-3:04 pm

1 stop4h 44m

$280

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Wed 8/6

7:29 pm-9:04 pm

Nonstop1h 35m

Washington, D.C. Dulles Intl

Tue 8/12

12:31 pm-2:13 pm

Nonstop1h 42m

$307

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Thu 9/4

9:50 am-11:33 am

Nonstop1h 43m

Washington, D.C. Dulles Intl

Sun 9/7

4:20 pm-7:59 pm

1 stop3h 39m

$314

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Sat 8/30

7:29 pm-9:12 pm

Nonstop1h 43m

Washington, D.C. Dulles Intl

Sat 9/6

12:35 pm-2:13 pm

Nonstop1h 38m

$315

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 10/17

7:00 am-10:16 am

1 stop3h 16m

$142

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 9/26

8:35 am-1:38 pm

1 stop5h 03m

$168

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Wed 8/27

7:29 pm-9:12 pm

Nonstop1h 43m

$178

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Thu 10/16

5:15 pm-5:50 pm

2 stops24h 35m

$215

OttawaWashington, D.C.

YOW - IAD

YOWIAD

Ottawa

Fri 8/29

5:55 am-9:01 pm

2 stops15h 06m

$229

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/15

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 July 11, 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, August is the cheapest month in which you can book a flight from Ottawa to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Ottawa to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 July 16, 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 afternoon could potentially save you up to 21% on airfare.

Weekly flight availability from Ottawa to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Ottawa to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 16, 2025.

The most flights from YOW to IAD are scheduled on a Monday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 on average).

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 July 16, 2025.
Get a feel of what it's like to fly with Porter Airlines, United Airlines, and WestJet 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
310 reviews

Food

7.6

Entertainment

7.0

Crew

8.7

Comfort

8.0

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Shawn,Jul 2025

EWR - YTZ

First time flying with porter and had an amazing experience. Will definitely use you guys whenever I get the chance. For context I had a flight from EWR to YTZ at 12:00pm. When I arrived early at 09:30 they put me on standby for the 10:00am, which I was able to make
Porter Airlines
8.0
Very good
310 reviews
Porter Airlines
8.0
Very good
310 reviews

Food

7.6

Entertainment

7.0

Crew

8.7

Comfort

8.0

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Shawn,Jul 2025

EWR - YTZ

First time flying with porter and had an amazing experience. Will definitely use you guys whenever I get the chance. For context I had a flight from EWR to YTZ at 12:00pm. When I arrived early at 09:30 they put me on standby for the 10:00am, which I was able to make
United Airlines
7.4
Good
8,863 reviews
Porter Airlines
8.0
Very good
310 reviews

Food

7.6

Entertainment

7.0

Crew

8.7

Comfort

8.0

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Shawn,Jul 2025

EWR - YTZ

First time flying with porter and had an amazing experience. Will definitely use you guys whenever I get the chance. For context I had a flight from EWR to YTZ at 12:00pm. When I arrived early at 09:30 they put me on standby for the 10:00am, which I was able to make
WestJet
7.2
Good
2,945 reviews
Porter Airlines
8.0
Very good
310 reviews

Food

7.6

Entertainment

7.0

Crew

8.7

Comfort

8.0

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Shawn,Jul 2025

EWR - YTZ

First time flying with porter and had an amazing experience. Will definitely use you guys whenever I get the chance. For context I had a flight from EWR to YTZ at 12:00pm. When I arrived early at 09:30 they put me on standby for the 10:00am, which I was able to make
Air Canada
7.1
Good
9,734 reviews
Porter Airlines
8.0
Very good
310 reviews

Food

7.6

Entertainment

7.0

Crew

8.7

Comfort

8.0

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Shawn,Jul 2025

EWR - YTZ

First time flying with porter and had an amazing experience. Will definitely use you guys whenever I get the chance. For context I had a flight from EWR to YTZ at 12:00pm. When I arrived early at 09:30 they put me on standby for the 10:00am, which I was able to make
Lufthansa
6.8
Okay
7,213 reviews
Porter Airlines
8.0
Very good
310 reviews

Food

7.6

Entertainment

7.0

Crew

8.7

Comfort

8.0

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Shawn,Jul 2025

EWR - YTZ

First time flying with porter and had an amazing experience. Will definitely use you guys whenever I get the chance. For context I had a flight from EWR to YTZ at 12:00pm. When I arrived early at 09:30 they put me on standby for the 10:00am, which I was able to make

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.

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

    Porter Airlines, at $268, was found to be the cheapest airline from Ottawa to Washington, D.C. Dulles Intl Airport.Alternate airlines to your destination round-trip include Air Canada and Lufthansa. These flights start at 27% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Ottawa to Washington, D.C. Dulles Intl Airport one-way?

    The cheapest airlines for a one-way flight from Ottawa to Washington, D.C. Dulles Intl Airport are Porter Airlines ($142), Air Canada ($168), and United Airlines ($178).

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

    Consider GoJet (73%), Air Canada (73%) or United Airlines (73%) 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 $486 for a flight from Ottawa to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $149 while the most popular route, (Ottawa - Washington, D.C. Dulles Intl) is currently priced at $239.

  • 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, August is the cheapest month in which you can book a flight from Ottawa to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Ottawa to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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
Woodbridge
Arlington
Alexandria
Tysons
Silver Spring
Fredericksburg
Gaithersburg
Easton
Fairfax
Towson
Linthicum Heights
Falls Church
Waldorf
Laurel
Rockville
Oxon Hill
Springfield
National Harbor
Manassas
Dundalk

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 July 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapest$197Average$373FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$240Average$443FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$312Average$485FlexibilityNo 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.