YOW - SEA

$185 Find Cheap Flights from Ottawa to Seattle

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 Seattle departing on 5/28. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ottawa to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ottawa to Seattle, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Ottawa to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ottawa to Seattle 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.

Recent round-trip flight deals from Ottawa to Seattle

KAYAK's recommended round-trip deals from the most popular airlines that fly from Ottawa to Seattle.
Discover the best prices for you by selecting your travel dates on KAYAK.
WestJet Logo
6:00 am - 12:58 pmYOW-SEA
9h 58m1 stop
WestJet Logo
7:05 am - 6:21 pmSEA-YOW
8h 16m1 stop
$328WestJet
Find Deal
Wed, May 28 - Wed, Jun 11
WestJet Logo
6:10 am - 12:58 pmYOW-SEA
9h 48m2 stops
WestJet Logo
2:05 pm - 12:41 amSEA-YOW
7h 36m1 stop
$330WestJet
Find Deal
Tue, May 27 - Tue, Jun 3
WestJet Logo
6:00 am - 12:58 pmYOW-SEA
9h 58m1 stop
WestJet Logo
7:05 am - 6:21 pmSEA-YOW
8h 16m1 stop
$331WestJet
Find Deal
Tue, May 27 - Tue, Jun 3
WestJet Logo
6:10 am - 12:58 pmYOW-SEA
9h 48m2 stops
WestJet Logo
7:05 am - 6:21 pmSEA-YOW
8h 16m1 stop
$336WestJet
Find Deal
Wed, May 28 - Wed, Jun 11
 Logo
9:05 am - 12:10 amYOW-SEA
18h 05m1 stop
 Logo
3:20 pm - 10:21 amSEA-YOW
16h 01m2 stops
Wed, May 21 - Tue, Jun 3
 Logo
3:45 pm - 12:10 amYOW-SEA
35h 25m2 stops
 Logo
3:20 pm - 7:55 pmSEA-YOW
25h 35m1 stop
Thu, May 22 - Tue, Jun 3
Air Canada Logo
2:35 pm - 7:37 pmYOW-SEA
8h 02m1 stop
Air Canada Logo
7:20 am - 8:17 pmSEA-YOW
9h 57m1 stop
$391Air Canada
Find Deal
Thu, May 22 - Tue, Jun 3
Air Canada Logo
2:35 pm - 7:37 pmYOW-SEA
8h 02m1 stop
Air Canada Logo
11:35 am - 12:19 amSEA-YOW
9h 44m1 stop
$397Air Canada
Find Deal
Thu, May 22 - Fri, Jun 13
United Airlines Logo
10:37 am - 12:59 amYOW-SEA
17h 22m2 stops
United Airlines Logo
12:35 pm - 9:11 amSEA-YOW
17h 36m3 stops
$427United Airlines
Find Deal
Wed, May 21 - Tue, May 27
United Airlines Logo
5:15 am - 10:45 amYOW-SEA
8h 30m1 stop
United Airlines Logo
12:35 pm - 9:11 amSEA-YOW
17h 36m3 stops
$428United Airlines
Find Deal
Thu, May 22 - Tue, May 27
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KAYAK's insights & trends for Ottawa to Seattle flights

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

What’s the cheapest day of the week to fly from Ottawa to Seattle?

The average price of all round-trip flights from Ottawa to Seattle clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Seattle on a Saturday and more expensive on a Monday. On your return trip to Ottawa, you should consider flying back on a Thursday, and avoid Sundays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ottawa to Seattle, 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 Seattle is March, where tickets cost $387 (return) on average. On the other hand, the most expensive months are December and November, where the average cost of round-trip tickets is $501 and $484 respectively.

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

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 Seattle, 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 Seattle, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 23 weeks before departure.

Good to know

Low seasonFebruary
High seasonAugust
Cheapest flight$185
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 9% lower on average.
Flight from Ottawa to Seattle

When to book flights from Ottawa to Seattle

Are your dates flexible? Find out the best times to travel from Ottawa to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ottawa to Seattle

  • What is the cheapest flight from Ottawa to Seattle?

    In the last 3 days, the lowest price for a flight from Ottawa to Seattle was $185 for a one-way ticket and $328 for a round-trip.

  • Do I need a passport to fly between Ottawa and Seattle?

    A passport is required to fly from Ottawa to Seattle.

  • Which airports will I be using when flying from Ottawa to Seattle?

    Ottawa and Seattle are both served by 1 main airport. You will leave Ottawa from Ottawa and will be arriving at Seattle/Tacoma Intl.

  • Which aircraft models fly most regularly from Ottawa to Seattle?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ottawa to Seattle?

    Star Alliance is the only airline alliance operating flights between Ottawa and Seattle.

  • Which is the best airline for flights from Ottawa to Seattle, United Airlines or WestJet?

    The two airlines most popular with KAYAK users for flights from Ottawa to Seattle are United Airlines and WestJet. With an average price for the route of $478 and an overall rating of 7.4, United Airlines is the most popular choice. WestJet is also a great choice for the route, with an average price of $368 and an overall rating of 7.2.

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

    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 Seattle.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ottawa 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 Seattle?

    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 to Seattle with an airline and back to Ottawa with another airline. Booking your flights between Ottawa and SEA can sometimes prove cheaper using this method.

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

    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 to Seattle from Ottawa up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top 3 airlines serving from Ottawa to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Ottawa to Seattle. 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 Seattle? 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 8696 reviews
7.3Comfort
7.7Boarding
6.6Food
8.1Crew
7.1Entertainment
Airline reviews

Our flights got changed from United to Air Canada and our purchased seats did not get transferred so we had to pay for seats twice. I brought it up with Air Canada and they stated I had to go back and chase it with United. The united seats were $21 Canadian each and Air Canada were $56 each so we have paid $77 for each seat. Very unhappy

2.0 MediocreBrant, Apr 2025YHZ - EWR
Read more United Airlines reviews

Our flights got changed from United to Air Canada and our purchased seats did not get transferred so we had to pay for seats twice. I brought it up with Air Canada and they stated I had to go back and chase it with United. The united seats were $21 Canadian each and Air Canada were $56 each so we have paid $77 for each seat. Very unhappy

So far so good but food and entertainment are not available for this flight

leg space better than expected. two washrooms for one plane isn't enough.

Plane temperature was comfortable (not to hot) when boarding and waiting for takeoff.

Michael, our FA was very attentive, even finding me a chocolate brownie from economy class when the dessert selections were all dairy based. ( intolerant, not allergic so don’t usually need to order dairy free)

We tried to upgrade to economy premium but were told this was not possible as we had booked through United Airlines (and Air Canada was operating the flight). This seemed silly given there was ample space in economy premium. Additionally, we had to wait almost 1.5 hours upon arrival to taxi to the gate. Otherwise, the crew were very pleasant and passengers were friendly.

It was my first time with United Airlines and I would say it was very good experience and best of all the flights were on time. Will definitely fly with United Airlines next time.

headphone jack didnt work for the first flight and not much variety

The seats on this flight were almost roomy enough to be the basic amount needed for human existence. I think my favorite part of this flight was it landed at an A gate, which was the most palatial part of Sea-Tac I've ever seen - a massive improvement from the S gates.

The seats on this flight were almost roomy enough to be the basic amount needed for human existence.

Internet on both flights was sketchy. Thus in flight entertainment was non- existent on MN - Balrimote leg.

We never had an experience they canceled the flight and they did not offer us an alternative flight. I had to book one on my own expense. They offered us food voucher and we could not use them at the airport it kept saying not attached to an existing flight. The people at the counter were rude and cold and they did not care about our situation

It took 30 minutes to check in with the Westjet rep. They didn’t have enough seats and she needed to make a call… I am always “randomly” selected to be checked at security. Their “randomly “ selection system may need some updating. They treat people like criminals. It is not appropriate behavior.

Found the seats very crowded—too close together ! And waited a long time for our luggage All staff at both ends were excellent!!!

Flight cancelled and Kayak switched our return flight to a red eye. Ridiculous.

Will never book through you again. Very disappointed in the notices and action taken or provided when planes are rescheduled, enough to cause missed connections

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

Very good over all , would have been nice to have entertainment on the flight

Absolutely the worst airline I have ever taken. They lost my baggage and told me my bag tags had been cancelled. When my bags arrived days later I had to pick them up at 3:15 am. My return flight was delayed another 6 hours and they broke my bag. Westjet does nothing to try and make it a better customer experience and all the customers services representatives I spoke with were useless and incompetent. Never flying westjet again.

Easy self checkin and baggage drop. No in seat entertainment, but wifi and app worked well

My flight got delayed 5 times and then got cancelled eventually, I had to get a hotel and uber and pay for food for an extra night without any plans. It was a horrible experience, instead of Air Canada, I was flying with United .

I had a nice flight with free wifi. So I was able to message family members and stream music during my flight, which made the trip go by fast. I also enjoyed flying on there Airbus A220. The plane looked very new and it also got up to speed fast down the runway and didn't need much runway to get airborne.

They lost my checked in luggage, why do I pay for my cargo not arriving at the same destination as me?

Overall good experience. The flight from Toronto to Denver does not have entertainment - movies to watch.

Poor planning meant the plane was delayed an hour, then a thunder storm started and the ground staff couldn't work. Eventual arrival in Santiago was 3 hours late resulting in missed connections and the need to buy new tickets.

Boarding was challenging as we had to use the stairs from the tarmac. Stairs are okay but a roller bag makes it challenging.

The take off was delayed as we were told that the baggages had to be rearranged to balance the weight. I only took a carry-on and a personal item, but the overhead bin was extremely small, even a normal size carryon can’t fit it, so they had to check it in for free. The seat was really tight and no entertainment at all.

The pork noodles were disgusting. The tuna sandwich had hardly any tuna and the bread was stale. A salad would have been better. An apple or a muffin.

My one complaint was that while we boarded using the standard enclosed gangway, when we arrived at SEATAC, the ground crew were slow to hook up the stairs. After reaching the tarmac we had to walk up a long ramp all outside in 35° weather. We just came from Bali and did not have warm weather clothes. This was in addition to having to collect our bags in Vancouver, take them through security again and then having to show our passports 4 more times all within the Air Canada section.

Air Canada is the worst but the only option for my route

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

Information on your arrival and departure airports

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