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Cheap flights from Ottawa to Seattle from $156

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 4/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Ottawa to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
5:40 am - 2:19 pm
YOW
-
SEA
11h 39m
2 stops
WestJet Logo
7:35 pm - 5:35 pm
SEA
-
YOW
19h 00m
2 stops
$273WestJet
Tue, Apr 21 - Mon, May 11
WestJet Logo
5:40 am - 2:19 pm
YOW
-
SEA
11h 39m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$274WestJet
Tue, Apr 21 - Mon, May 11
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
$285WestJet
Tue, May 19 - Tue, Jun 2
WestJet Logo
6:25 pm - 6:45 pm
YOW
-
SEA
27h 20m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$288WestJet
Wed, Apr 29 - Wed, May 6
WestJet Logo
5:40 am - 2:19 pm
YOW
-
SEA
11h 39m
2 stops
WestJet Logo
3:10 pm - 12:39 am
SEA
-
YOW
30h 29m
2 stops
$294WestJet
Tue, Apr 14 - Fri, Apr 17
WestJet Logo
5:45 pm - 2:19 pm
YOW
-
SEA
23h 34m
1 stop
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$304WestJet
Tue, Apr 21 - Mon, May 11
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
$305WestJet
Mon, Jun 15 - Mon, Jun 22
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
$312WestJet
Mon, Jun 1 - Fri, Jun 12
WestJet Logo
5:40 am - 2:19 pm
YOW
-
SEA
35h 39m
2 stops
WestJet Logo
3:10 pm - 12:39 am
SEA
-
YOW
30h 29m
2 stops
$314WestJet
Wed, Apr 8 - Wed, Apr 15
WestJet Logo
1:20 pm - 6:45 pm
YOW
-
SEA
8h 25m
1 stop
WestJet Logo
10:30 am - 5:15 pm
SEA
-
YOW
27h 45m
1 stop
$317WestJet
Mon, May 11 - Fri, May 15

United Airlines flights from Ottawa to Seattle

Our best United Airlines deals on Ottawa to Seattle flight tickets
United Airlines
Apr 9
YOW10:44 amOttawa
16h 50m
1 stop
SEA12:34 amSeattle/Tacoma Intl
Apr 12
SEA11:59 pmSeattle/Tacoma Intl
11h 00m
1 stop
YOW1:59 pmOttawa
$352
United Airlines
Apr 8
YOW5:25 pmOttawa
8h 17m
1 stop
SEA10:42 pmSeattle/Tacoma Intl
Apr 14
SEA7:00 amSeattle/Tacoma Intl
7h 07m
1 stop
YOW5:07 pmOttawa
$353
United Airlines
Apr 8
YOW5:50 pmOttawa
8h 56m
1 stop
SEA11:46 pmSeattle/Tacoma Intl
Apr 15
SEA6:30 amSeattle/Tacoma Intl
12h 35m
2 stops
YOW10:05 pmOttawa
$368

WestJet flights from Ottawa to Seattle

Our best WestJet deals on Ottawa to Seattle flight tickets
WestJet
Apr 21
YOW5:40 amOttawa
11h 39m
2 stops
SEA2:19 pmSeattle/Tacoma Intl
May 11
SEA7:35 pmSeattle/Tacoma Intl
19h 00m
2 stops
YOW5:35 pmOttawa
$273
WestJet
Apr 21
YOW5:40 amOttawa
11h 39m
2 stops
SEA2:19 pmSeattle/Tacoma Intl
May 11
SEA7:35 pmSeattle/Tacoma Intl
7h 00m
1 stop
YOW5:35 amOttawa
$274
WestJet
May 19
YOW1:20 pmOttawa
8h 25m
1 stop
SEA6:45 pmSeattle/Tacoma Intl
Jun 2
SEA7:35 pmSeattle/Tacoma Intl
7h 00m
1 stop
YOW5:35 amOttawa
$285

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 March 6, 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

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 4/21

5:40 am-2:19 pm

2 stops11h 39m

Seattle/Tacoma Intl

Mon 5/11

7:35 pm-5:35 pm

2 stops19h 00m

$273

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 4/21

5:40 am-2:19 pm

2 stops11h 39m

Seattle/Tacoma Intl

Mon 5/11

7:35 pm-5:35 am

1 stop7h 00m

$274
Quickest round-trip

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 5/19

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Tue 6/2

7:35 pm-5:35 am

1 stop7h 00m

$285

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 4/29

6:25 pm-6:45 pm

2 stops27h 20m

Seattle/Tacoma Intl

Wed 5/6

7:35 pm-5:35 am

1 stop7h 00m

$288

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 4/14

5:40 am-2:19 pm

2 stops11h 39m

Seattle/Tacoma Intl

Fri 4/17

3:10 pm-12:39 am

2 stops30h 29m

$294

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 4/21

5:45 pm-2:19 pm

1 stop23h 34m

Seattle/Tacoma Intl

Mon 5/11

7:35 pm-5:35 am

1 stop7h 00m

$304

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 6/15

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Mon 6/22

7:35 pm-5:35 am

1 stop7h 00m

$305

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 6/1

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Fri 6/12

7:35 pm-5:35 am

1 stop7h 00m

$312

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 4/8

5:40 am-2:19 pm

2 stops35h 39m

Seattle/Tacoma Intl

Wed 4/15

3:10 pm-12:39 am

2 stops30h 29m

$314

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 5/11

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Fri 5/15

10:30 am-5:15 pm

1 stop27h 45m

$317

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 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 $337.

How far in advance should I book a flight 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 $399 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 $309 on momondo.

Can stopping save me money on Ottawa to Seattle flights?

You could potentially save up to 16% on your flight if you consider stops on a Ottawa to Seattle flight.

How have Ottawa to Seattle flight prices changed over time?

As of March 2026, prices for Ottawa to Seattle flights are approximately 62% cheaper 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 17m

Direct flights

None
The fastest flight from Ottawa to Seattle takes 8h 17m
There are no direct flights from Ottawa to Seattle. There are no popular flight routes from Ottawa to Seattle.
Search flight deals

  • 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 17m, 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
9,403 reviews
Search United Airlines flights
WestJetPriceFrom $277Free CancellationRating
7.2
3,281 reviews
Search WestJet flights
Air CanadaPriceFrom $304Free CancellationRating
7.1
10,780 reviews
Search Air Canada 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
Kent
Marysville
Redmond
Cle Elum
Puyallup
Lakewood
Tukwila
Federal Way
Fife
Westport
Kirkland
Centralia
Tumwater

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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