YOW - SEA

$198 Find Cheap Flights from Ottawa to Seattle - 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 Seattle departing on 10/6. 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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Everything you should know

Cheapest round-trip
$330
Typical prices: $304-$431
WestJet
Tue 9/15Tue 9/29
YOW - SEA • 1 stop
Cheapest one-way
$198
Typical prices: $182-$317
WestJet
Tue 10/6
YOW - SEA • 1 stop
Top airlines
Cheapest • from $330 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ottawa and Seattle. You'll need at least 1 connection.
Insights
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Insights
Top layover airports
Cheapest • Avg $477 (round-trip)
Shortest trip • 8h 19m (one-way)
Insights
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Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 40% compared to booking last minute.
Insights
Insights
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Insights
When to travel
Cheapest • 35% price drop
Most popular
Good to know
Good to know
+1
+1
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Good to know
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ottawa to Seattle (YOW-SEA)

 
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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ottawa to Seattle

Tue, Sep 15 - Tue, Sep 29
WestJet Logo
1:20 pm - 6:45 pm
YOW
-
SEA
8h 25m
1 stop
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$330WestJet
Sat, Sep 12 - Thu, Sep 24
WestJet Logo
1:20 pm - 6:45 pm
YOW
-
SEA
8h 25m
1 stop
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$335WestJet
Sun, Sep 6 - Sun, Sep 27
WestJet Logo
12:25 pm - 9:00 pm
YOW
-
SEA
11h 35m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$338WestJet
Fri, Sep 4 - Mon, Sep 7
Air Canada Logo
6:05 pm - 10:42 pm
YOW
-
SEA
7h 37m
1 stop
Air Canada Logo
5:50 am - 4:26 pm
SEA
-
YOW
7h 36m
1 stop
$396Air Canada
Tue, Sep 1 - Mon, Sep 7
Air Canada Logo
6:05 pm - 10:42 pm
YOW
-
SEA
7h 37m
1 stop
Air Canada Logo
5:50 am - 4:26 pm
SEA
-
YOW
7h 36m
1 stop
$401Air Canada
Fri, Sep 18 - Mon, Sep 28
Multiple Airlines Logo
1:20 pm - 9:42 am
YOW
-
SEA
23h 22m
2 stops
Multiple Airlines Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$425Multiple Airlines
Wed, Aug 19 - Wed, Sep 2
Air Canada Logo
6:05 pm - 10:42 pm
YOW
-
SEA
7h 37m
1 stop
Air Canada Logo
5:50 am - 1:09 am
SEA
-
YOW
16h 19m
1 stop
$432Air Canada
Sun, Aug 16 - Sat, Sep 12
Multiple Airlines Logo
1:20 pm - 11:04 am
YOW
-
SEA
24h 44m
2 stops
Multiple Airlines Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$456Multiple Airlines
Mon, Nov 16 - Fri, Nov 20
United Airlines Logo
6:00 am - 9:19 pm
YOW
-
SEA
18h 19m
2 stops
United Airlines Logo
3:49 pm - 3:07 pm
SEA
-
YOW
20h 18m
2 stops
$466United Airlines
Tue, Aug 18 - Wed, Sep 2
United Airlines Logo
6:25 am - 11:32 am
YOW
-
SEA
8h 07m
1 stop
United Airlines Logo
9:05 am - 11:54 pm
SEA
-
YOW
11h 49m
2 stops
$512United Airlines
Booking Insights

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.

How much is a round-trip flight from Ottawa to Seattle?

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 Seattle departing in September.

Flight prices are below average for this route right now.

Flights to Seattle from Ottawa usually cost between $382 and $480 in September.
The lowest price found in the past 5 days was $330 on WestJet (Sep 15-Sep 29).

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 January, where tickets cost $285 (return) on average. On the other hand, the most expensive months are July and May, where the average cost of round-trip tickets is $574 and $572 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 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

$198
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

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 5 days, the lowest price for a flight from Ottawa to Seattle was $198 for a one-way ticket and $330 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 $422 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 $449 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.

Reviews of the 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 10052 reviews
7.3Comfort
6.6Food
7.7Boarding
8.1Crew
7.1Entertainment
Airline reviews

The flight was delayed by a hour and I wish they had communicated it sooner. No issues on the plane, it did take a while for food to come.

6.0 GoodMatthew, Jul 2026
ORD - SEA
Read more United Airlines reviews

The flight was delayed by a hour and I wish they had communicated it sooner. No issues on the plane, it did take a while for food to come.

Smooth and easy boarding, comfortable for the entire 5 hour flight, and the seat back entertainment was great! I appreciated all the features, from location info and maps, movies, the ability to connect with Bluetooth headphones, and good selection of movies. Food was good, normal airline snacks (I didn’t purchase anything)

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

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

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.

Everything was fantastic. Modern plane. All the amenities! Although the paid snacks and meals are pure robbery. Like i understand airlines need to make money, but 11$ USD for an overnight oats with some nuts in it and barely any pieces of apple.... Highway robbery

An hour and a half late is UNACCEPTABLE. The negative impact to our family is unconscionable. And for the price we were forced to pay...

Our flight was delayed many times throughout the day. The final delay was about 8 hours. I spent time in line to speak to someone at their understaffed desk, and also spent time waiting online and then chatting with a service rep. None of the United employees were any help at all. I desperately wanted to go get rest and possibly re-book my trip but I was denied any compensation or voucher for a hotel. I was repeatedly told it was not United's fault and therefore they had no compensation to offer. Overall, a cold and callous experience.

Flight crew and pilots did great. Flight way delayed due to a part needing replacement. Based on what the pilot indicated- the maintenance crew could’ve resolved this more efficiently than replacing whole part- and taken less time

The most cramped seating I’ve ever experienced, (including budget airlines) with no food available for purchase on a nearly 6 hour flight.

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.

They lost my bag. Hopefully it will be here tomorrow.

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

Got denied my flight was told on Google that Air Canada was supposed to book me a flight back home because I never was able to go to my destination. They did not help me whatsoever. I had to book a whole new flight for that reason I would write this is zero

After i biked my flights, i was informed my flight was rescheduled for later time

Air Canada had a lot of delays on our flight going back to Seattle. So much inconvenience for a long trip.

Great TV, easy boarding, wonderful ground crew and flight crew.

As is pretty much the norm with Air Canada now, we left late from the gate (45 minutes late). This is my 12th flight with AC in the last 12 months and 10 of those flights were either late or cancelled. AC essentially has a monopoly in Canada so they have carte blanche to charge exorbitant rates now and give poor service, with no repercussions.

They did not have any meal options left on the menu. Only snacks.

In Toronto (YYZ) on our inbound flight to SEA Tac: I don't understand why our passport had to be scanned again, at the boarding gate for the 3rd time after passing through both Canadian & U.S. inspection and customs. This was NOT done on our outbound flight to Montreal. Also, the gate personnel at YYZ did not use the microphone for boarding, instead they decided to speak quietly so no one could hear, leading to a pretty significant backup boarding the plane.

Airplane was clean and comfortable. Flight was on time leaving. It was a little late leaving on the return but in the end it was still on time lol. All felt smooth and easeful. Grateful for a non stop flight. The cabin stewards were all kind and service was rolled out smoothly. The Air Canada departure area in Seattle airport was a little short on water and food options so if you need snacks watch for them before you get into that gate area.

A very convenient, direct flight with no issues and comfy seats.

A guy two rows behind me started smoking mid flight. My eyes still burn 4 hours later. Food sucked. Sitting in the plane for 1.5 hours while they searched fir bags was insane.

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

Information on your arrival and departure airports