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Cheap flights from Ottawa to Seattle from $215

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ottawa to Seattle departing on 12/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ottawa to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
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
$373WestJet
Wed, Sep 30 - Sun, Oct 4
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
$374WestJet
Wed, Sep 30 - Sun, Oct 4
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
$375WestJet
Fri, Sep 25 - Wed, Sep 30
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
$377WestJet
Wed, Sep 30 - Tue, Oct 6
WestJet Logo
6:55 am - 6:45 pm
YOW
-
SEA
14h 50m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$379WestJet
Wed, Sep 30 - Sun, Oct 4
WestJet Logo
1:20 pm - 6:45 pm
YOW
-
SEA
8h 25m
1 stop
WestJet Logo
10:30 am - 12:20 am
SEA
-
YOW
10h 50m
2 stops
$380WestJet
Wed, Sep 30 - Sun, Oct 4
WestJet Logo
6:55 am - 6:45 pm
YOW
-
SEA
14h 50m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$381WestJet
Fri, Sep 25 - Wed, Sep 30
WestJet Logo
6:55 am - 6:45 pm
YOW
-
SEA
14h 50m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$383WestJet
Wed, Sep 30 - Tue, Oct 6
WestJet Logo
6:55 am - 6:45 pm
YOW
-
SEA
14h 50m
2 stops
WestJet Logo
10:30 am - 12:20 am
SEA
-
YOW
10h 50m
2 stops
$385WestJet
Wed, Sep 30 - Sun, Oct 4
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
$386WestJet
Wed, Sep 30 - Sun, Oct 4

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Air Canada flights from Ottawa to Seattle

Our best Air Canada deals on Ottawa to Seattle flight tickets
Air Canada
Sep 14
YOW5:00 amOttawa
8h 07m
1 stop
SEA10:07 amSeattle/Tacoma Intl
Sep 14
SEA7:20 pmSeattle/Tacoma Intl
7h 38m
1 stop
YOW5:58 amOttawa
$429
Air Canada
Oct 23
YOW10:00 amOttawa
11h 32m
2 stops
SEA6:32 pmSeattle/Tacoma Intl
Oct 26
SEA7:45 amSeattle/Tacoma Intl
8h 33m
1 stop
YOW7:18 pmOttawa
$440
Air Canada
Oct 23
YOW10:00 amOttawa
11h 32m
2 stops
SEA6:32 pmSeattle/Tacoma Intl
Oct 26
SEA7:45 amSeattle/Tacoma Intl
8h 33m
1 stop
YOW7:18 pmOttawa
$441

WestJet flights from Ottawa to Seattle

Our best WestJet deals on Ottawa to Seattle flight tickets
WestJet
Sep 30
YOW1:20 pmOttawa
8h 25m
1 stop
SEA6:45 pmSeattle/Tacoma Intl
Oct 4
SEA7:35 pmSeattle/Tacoma Intl
7h 00m
1 stop
YOW5:35 amOttawa
$373
WestJet
Sep 30
YOW1:20 pmOttawa
8h 25m
1 stop
SEA6:45 pmSeattle/Tacoma Intl
Oct 4
SEA7:35 pmSeattle/Tacoma Intl
7h 00m
1 stop
YOW5:35 amOttawa
$374
WestJet
Sep 25
YOW1:20 pmOttawa
8h 25m
1 stop
SEA6:45 pmSeattle/Tacoma Intl
Sep 30
SEA7:35 pmSeattle/Tacoma Intl
7h 00m
1 stop
YOW5:35 amOttawa
$375

momondo Fare Finder

 
Customize your flight search to find flights from Ottawa to Seattle 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, momondo users made 832,500 searches. Data last updated June 23, 2026.
Use the filters below to find and compare flights from Ottawa to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/30

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Sun 10/4

7:35 pm-5:35 am

1 stop7h 00m

$373

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/30

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Sun 10/4

7:35 pm-5:35 am

1 stop7h 00m

$374

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 9/25

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Wed 9/30

7:35 pm-5:35 am

1 stop7h 00m

$375

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/30

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Tue 10/6

7:35 pm-5:35 am

1 stop7h 00m

$377

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/30

6:55 am-6:45 pm

2 stops14h 50m

Seattle/Tacoma Intl

Sun 10/4

7:35 pm-5:35 am

1 stop7h 00m

$379

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/30

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Sun 10/4

10:30 am-12:20 am

2 stops10h 50m

$380

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 9/25

6:55 am-6:45 pm

2 stops14h 50m

Seattle/Tacoma Intl

Wed 9/30

7:35 pm-5:35 am

1 stop7h 00m

$381

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/30

6:55 am-6:45 pm

2 stops14h 50m

Seattle/Tacoma Intl

Tue 10/6

7:35 pm-5:35 am

1 stop7h 00m

$383

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/30

6:55 am-6:45 pm

2 stops14h 50m

Seattle/Tacoma Intl

Sun 10/4

10:30 am-12:20 am

2 stops10h 50m

$385

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/30

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Sun 10/4

7:35 pm-5:35 am

1 stop7h 00m

$386

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Ottawa to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Ottawa and Seattle?

What is the cheapest month to fly to Seattle?

In general, January is the cheapest month to fly from Ottawa to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $285. If you don’t want to visit Seattle in January, then you should wait until September to fly from Ottawa, when ticket prices are also cheap, with an average price of $330.

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

You are more likely to see cheaper flights to Seattle from Ottawa when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $429 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Ottawa for as low as $267 on momondo.

How have Ottawa to Seattle flight prices changed over time?

As of June 2026, prices for Ottawa to Seattle flights are approximately 27% more expensive when compared to flights at the same time last year.

When to book flights from Ottawa to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Ottawa to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ottawa to Seattle (YOW to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ottawa to Seattle

Fastest flight time

8h 25m

Direct flights

None
The fastest flight from Ottawa to Seattle takes 8h 25m
There are no direct flights from Ottawa to Seattle. There are no popular flight routes from Ottawa to Seattle.
Search flight deals

Frequently asked questions about flying from Ottawa to Seattle

  • How far is Ottawa to Seattle/Tacoma Intl by plane?

    The distance between Ottawa and Seattle/Tacoma Intl is about 2187.8 mi. Flights usually cover this in 8h 25m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Ottawa Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Ottawa Airport to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Ottawa Airport to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Ottawa Airport to Seattle/Tacoma Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ottawa Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ottawa to Seattle?

Best airlines flying from Ottawa to Seattle

Compare and see reviews for airlines that fly from Ottawa to Seattle with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $275Free CancellationRating
7.4
9,879 reviews
Search United Airlines flights
Air CanadaPriceFrom $304Free CancellationRating
7.1
11,250 reviews
Search Air Canada flights
WestJetPriceFrom $358Free CancellationRating
7.2
3,383 reviews
Search WestJet flights

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Redmond
Kent
Lakewood
Puyallup
Tukwila
Federal Way
Fife
Cle Elum
Marysville
Centralia
Kirkland
Shoreline
Westport

Why use momondo?

Why should I use momondo to find a flight deal from Ottawa to Seattle?

It is quick and easy to find Ottawa to Seattle flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Seattle that suits you.

Can I find flights from Ottawa to Seattle with flexible booking policies on momondo?

momondo does allow users to show only those flights to Seattle from Ottawa which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Ottawa to Seattle?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ottawa to Seattle.

I’m not ready to book a flight from Ottawa to Seattle right now. Can momondo alert me if prices change?

Price alerts on flights to Seattle from Ottawa are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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