$178 Find Cheap Flights from Ottawa to Washington - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ottawa to Washington departing on 8/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Book Cheap Ottawa to Washington Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ottawa to Washington that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ottawa to Washington

Mon, Sep 14 - Mon, Sep 21
WestJet Logo
12:25 pm - 6:45 pmYOW  Ottawa-SEA Seattle/Tacoma Intl
9h 20m2 stops Winnipeg Calgary
WestJet Logo
7:35 pm - 5:35 amSEA  Seattle/Tacoma Intl-YOW Ottawa
7h 00m1 stop Calgary
$319WestJet
Thu, Sep 3 - Thu, Sep 10
WestJet Logo
12:25 pm - 9:00 pmYOW  Ottawa-SEA Seattle/Tacoma Intl
11h 35m2 stops Winnipeg Calgary
WestJet Logo
7:35 pm - 5:35 amSEA  Seattle/Tacoma Intl-YOW Ottawa
7h 00m1 stop Calgary
$332WestJet
Sat, Sep 26 - Sat, Oct 3
WestJet Logo
12:25 pm - 6:45 pmYOW  Ottawa-SEA Seattle/Tacoma Intl
9h 20m2 stops Winnipeg Calgary
WestJet Logo
7:35 pm - 5:35 amSEA  Seattle/Tacoma Intl-YOW Ottawa
7h 00m1 stop Calgary
$336WestJet
Thu, Sep 17 - Thu, Sep 24
Air Canada Logo
2:45 pm - 10:47 pmYOW  Ottawa-SEA Seattle/Tacoma Intl
11h 02m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl
Air Canada Logo
8:00 am - 7:10 pmSEA  Seattle/Tacoma Intl-YOW Ottawa
8h 10m1 stop Toronto Pearson Intl
$408Air Canada
Sat, Oct 24 - Thu, Nov 5
Air Canada Logo
5:00 am - 9:52 amYOW  Ottawa-SEA Seattle/Tacoma Intl
7h 52m1 stop Vancouver Intl
Air Canada Logo
8:40 am - 11:11 pmSEA  Seattle/Tacoma Intl-YOW Ottawa
11h 31m2 stops Vancouver Intl Calgary
$411Air Canada
Wed, Aug 26 - Wed, Aug 26
United Airlines Logo
6:00 am - 7:07 pmYOW  Ottawa-SEA Seattle/Tacoma Intl
16h 07m3 stops Washington, D.C. Dulles Intl Indianapolis Chicago O'Hare Intl
United Airlines Logo
10:58 pm - 4:38 pmSEA  Seattle/Tacoma Intl-YOW Ottawa
14h 40m1 stop Newark
$411United Airlines
Thu, Aug 27 - Thu, Aug 27
United Airlines Logo
6:00 am - 7:07 pmYOW  Ottawa-SEA Seattle/Tacoma Intl
16h 07m3 stops Washington, D.C. Dulles Intl Indianapolis Chicago O'Hare Intl
United Airlines Logo
11:04 pm - 9:56 amSEA  Seattle/Tacoma Intl-YOW Ottawa
7h 52m1 stop Washington, D.C. Dulles Intl
$411United Airlines
Tue, Oct 27 - Thu, Nov 5
Air Canada Logo
7:45 am - 2:37 pmYOW  Ottawa-SEA Seattle/Tacoma Intl
9h 52m1 stop Vancouver Intl
Air Canada Logo
8:40 am - 11:11 pmSEA  Seattle/Tacoma Intl-YOW Ottawa
11h 31m2 stops Vancouver Intl Calgary
$411Air Canada
Mon, Sep 14 - Mon, Sep 21
Multiple Airlines Logo
2:50 pm - 10:47 pmYOW  Ottawa-SEA Seattle/Tacoma Intl
10h 57m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl
Multiple Airlines Logo
5:50 am - 5:35 amSEA  Seattle/Tacoma Intl-YOW Ottawa
20h 45m3 stops Vancouver Intl Edmonton Calgary
$443Multiple Airlines
Thu, Sep 17 - Thu, Sep 24
Multiple Airlines Logo
2:45 pm - 10:47 pmYOW  Ottawa-SEA Seattle/Tacoma Intl
11h 02m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl
Multiple Airlines Logo
5:50 am - 5:35 amSEA  Seattle/Tacoma Intl-YOW Ottawa
20h 45m3 stops Vancouver Intl Edmonton Calgary
$450Multiple Airlines
Booking Insights

KAYAK's insights & trends for Ottawa to Washington flights

Get data-powered insights and trends into flights from Ottawa to Washington to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Ottawa to State of Washington?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ottawa to State of Washington departing in September.

Flight prices are below average for this route right now.

Flights to State of Washington from Ottawa usually cost between $382 and $480 in September.
The lowest price found in the past 5 days was $319 on WestJet (Sep 14-Sep 21).

What is the cheapest month to fly from Ottawa to Washington?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ottawa to Washington, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ottawa to Washington is January, when tickets cost $285 (return) on average. On the other hand, the most expensive months are May and July, when the average cost of round-trip tickets is $572 and $562 respectively.

How far in advance should I book a flight from Ottawa to Washington?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ottawa to Washington, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ottawa to Washington, you should book around 4 weeks before departure, which saves you about 40% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low season

March

Cheapest flight

$178
Best time to beat the crowds but there is an average 12% increase in price.
Most popular time to fly with an average 8% increase in price.
Flight from Ottawa to Seattle

FAQs - booking Washington flights

  • How does KAYAK find such low prices on flights from Ottawa to Washington?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ottawa to Washington.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ottawa to Washington?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ottawa to Washington is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ottawa to Washington?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Ottawa to Washington with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ottawa to Washington?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Ottawa to Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Ottawa to Washington

 
See real verified KAYAK customer reviews for airlines flying from Ottawa to Washington. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ottawa to Washington? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 10064 reviews
7.7Boarding
7.1Entertainment
7.3Comfort
8.1Crew
6.7Food
Airline reviews

Crew were welcoming, accommodating and they worked hard to find places for all carry on.

10.0 ExcellentPatricia, Jun 2026
Read more United Airlines reviews

Crew were welcoming, accommodating and they worked hard to find places for all carry on.

very average service no complimentary alcoholics drinks unlike other airlines such as Porter airlines No decent seats available during check-in time the day before

It was great. There were some issues prior to takeoff. The weather was poor so we had to go through deicing, and we were delayed a bit by the pilots' concern about one of the engines, but that's aviation. The pilots handled everything with aplomb, and kept us apprised

I dread trans-Pacific flights. They are very long. This was my first time on Universal, and it was my best crossing ever. The staff were professional, the hospitality was great, and the food was delicious. The entertainment system filled the long flight hours. I will seek out Universal flights from now onwards. 🙂

My flight was delayed about 1 1/2 hours in Chicago, but other then that it was a good flight.

The flight was delayed, it took longer than anticipated because of weather, and they broke my luggage.

lots of delays the crew were unclear about where to pick up my carry-on, which they took from me to check in on the plane.

My connecting gate in .Chicago was across the aisle from my arriving gate. Otherwise I would not have made my connection. So that was very fortunate.

My flight was delayed by a whole day, so I lost a day of my vacation.

How would you rate my experience when I was stuck in YOW without being offered a cup of water by the airline?

Maybe glass of wine would be nice at no charge

The agents at the Kelowna YLW airport were really grumpy. Same with oversized baggage person. Staff on the plane were great.

Experience was good, the wifi hook up is somewhat tough

I will not be flying with westjet again. I was uncomfortable in my seat. The position made my back hurt so bad. My wife was able to fit the seatbelt around her with out an extension but was unable to put the tray table down or fit in the seat for that matter. Our bag was smashed and I spent two hours trying to fill out the application for a damaged bag before I gave up. The 80 photos I took would not work and nothing telling me the format to upload them as.. I made the mistake of unpacking the bag before taking photos so no claim for me. Next trip to Canada I will have to use air Canada.

Airplane is too small. Crew, especially the flight attendant who looked after our area, was not at all friendly and a touch authoratative. She may have been the most gruff flight attendant i've come across in 40 years of business travel

Good value, minor delay due to waiting for inbound plane but they gave accurate information about wait time. Able to switch to a seat by my husband thanks to a kind flight attendant

Lost my luggage. Filed a report and there is no response. Received a phone call from another airline that said they had the bag and they did not know what to do with it

Terrible! Delayed three times, landed at some corner of airport, walked in bitter cold night, took a bus, bad experience

Not a tonne of food for purchase items for early morning.

Long delay die to pet mix up. Also bags took forever to get to carousel

The flight was good. My luggage didn’t land with me when I arrived in Columbus. So grateful I was able to get my luggage back within the 2 hours😍👍.

It was out first time flying Air Canada and it was ok, comfort-wise. I hope airlines are able to get a quiet room installed for young children flying. Screaming and crying the whole time in business class is quite unfortunate. That was the only thing that really messed up the experience.

Staff were very friendly. Plane left on time and arrived on time.

The Flight Attendant was particularly helpful to my wife, who was having a bad day.

It is air Canada so leaving 20 minutes late is very acceptable

One United employee a little impatient, also on flight WiFi was out for some time. I was happy to receive a complimentary alcoholic beverage for volunteering to check my carry on bag.

Everything was great, staff, planes, at the gate. All around everything was a pleasure flying .

I COULD NOT GET ON THE FLIGHT BECAUSE THE AIR CANADA CHECK-IN STAFF COULD NOT CHECK ME IN NEITHER COULD THEY DIRECT ME TO THE ALTERNATIVE CHECK-IN AIRLINE I DIDN'T FLY AND HAD TO REBOOK ANOTHER AIRLINE, PORTER FOR THE FOLLOWING DAY. I NEED MY REFUND FOR THE RETURN LEG

When a person pays 500 $ for one way ticket that person should have better seat not the seat before the bathrooms.🤔🤨

Seating is very tight. We were delayed 90 minutes to board, because the flight crew were late

Everything you need to know for your flight from Ottawa to Washington

Information on your arrival and departure airports