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Cheap flights from Ottawa to Seattle from C$ 221

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 3/11. 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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Find the cheapest flights from Ottawa to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
12:00 p.m. - 9:51 p.m.YOW-SEA
12h 51m1 stop
Air Canada Logo
5:50 a.m. - 3:45 p.m.SEA-YOW
6h 55m1 stop
C$ 360Air Canada
Find Deal
Thu, 9 Apr - Thu, 16 Apr
Air Canada Logo
7:45 a.m. - 2:31 p.m.YOW-SEA
9h 46m1 stop
Air Canada Logo
5:50 a.m. - 3:45 p.m.SEA-YOW
6h 55m1 stop
C$ 366Air Canada
Find Deal
Wed, 19 Nov - Wed, 26 Nov
Air Canada Logo
4:10 p.m. - 10:16 p.m.YOW-SEA
9h 06m1 stop
Air Canada Logo
5:50 a.m. - 3:45 p.m.SEA-YOW
6h 55m1 stop
C$ 374Air Canada
Find Deal
Tue, 18 Nov - Wed, 26 Nov
Multiple Airlines Logo
6:00 a.m. - 10:46 p.m.YOW-SEA
19h 46m1 stop
Multiple Airlines Logo
5:50 a.m. - 3:45 p.m.SEA-YOW
6h 55m1 stop
C$ 378Multiple Airlines
Find Deal
Thu, 13 Nov - Thu, 20 Nov
United Airlines Logo
11:10 a.m. - 6:52 p.m.YOW-SEA
10h 42m1 stop
United Airlines Logo
7:00 a.m. - 5:12 p.m.SEA-YOW
7h 12m1 stop
C$ 387United Airlines
Find Deal
Thu, 20 Nov - Fri, 28 Nov
United Airlines Logo
11:10 a.m. - 10:45 p.m.YOW-SEA
14h 35m1 stop
United Airlines Logo
11:52 p.m. - 1:32 p.m.SEA-YOW
10h 40m1 stop
C$ 391United Airlines
Find Deal
Fri, 31 Oct - Sun, 2 Nov
Multiple Airlines Logo
6:00 a.m. - 10:46 p.m.YOW-SEA
19h 46m1 stop
Multiple Airlines Logo
5:50 a.m. - 1:38 a.m.SEA-YOW
16h 48m2 stops
C$ 420Multiple Airlines
Find Deal
Thu, 13 Nov - Thu, 20 Nov
WestJet Logo
6:00 a.m. - 2:20 p.m.YOW-SEA
11h 20m1 stop
WestJet Logo
3:10 p.m. - 6:21 p.m.SEA-YOW
24h 11m2 stops
C$ 436WestJet
Find Deal
Sun, 23 Nov - Sun, 30 Nov
WestJet Logo
5:40 a.m. - 2:19 p.m.YOW-SEA
11h 39m2 stops
WestJet Logo
3:10 p.m. - 6:23 p.m.SEA-YOW
24h 13m2 stops
C$ 447WestJet
Find Deal
Thu, 9 Apr - Thu, 16 Apr
American Airlines Logo
6:45 a.m. - 11:13 p.m.YOW-SEA
19h 28m2 stops
American Airlines Logo
12:59 a.m. - 4:49 p.m.SEA-YOW
13h 50m2 stops
C$ 660American Airlines
Find Deal
Fri, 31 Oct - Sat, 1 Nov

Air Canada flights from Ottawa to Seattle

Our best Air Canada deals on Ottawa to Seattle flight tickets
Air Canada
9 Apr
YOW12:00 p.m.Ottawa
12h 51m
1 stop
SEA9:51 p.m.Seattle/Tacoma Intl
16 Apr
SEA5:50 a.m.Seattle/Tacoma Intl
6h 55m
1 stop
YOW3:45 p.m.Ottawa
C$ 360
Find similar
Air Canada
19 Nov
YOW7:45 a.m.Ottawa
9h 46m
1 stop
SEA2:31 p.m.Seattle/Tacoma Intl
26 Nov
SEA5:50 a.m.Seattle/Tacoma Intl
6h 55m
1 stop
YOW3:45 p.m.Ottawa
C$ 366
Find similar
Air Canada
18 Nov
YOW4:10 p.m.Ottawa
9h 06m
1 stop
SEA10:16 p.m.Seattle/Tacoma Intl
26 Nov
SEA5:50 a.m.Seattle/Tacoma Intl
6h 55m
1 stop
YOW3:45 p.m.Ottawa
C$ 374
Find similar

United Airlines flights from Ottawa to Seattle

Our best United Airlines deals on Ottawa to Seattle flight tickets
United Airlines
20 Nov
YOW11:10 a.m.Ottawa
10h 42m
1 stop
SEA6:52 p.m.Seattle/Tacoma Intl
28 Nov
SEA7:00 a.m.Seattle/Tacoma Intl
7h 12m
1 stop
YOW5:12 p.m.Ottawa
C$ 387
Find similar
United Airlines
31 Oct
YOW11:10 a.m.Ottawa
14h 35m
1 stop
SEA10:45 p.m.Seattle/Tacoma Intl
2 Nov
SEA11:52 p.m.Seattle/Tacoma Intl
10h 40m
1 stop
YOW1:32 p.m.Ottawa
C$ 391
Find similar
United Airlines
7 Nov
YOW10:30 a.m.Ottawa
27h 05m
2 stops
SEA10:35 a.m.Seattle/Tacoma Intl
15 Nov
SEA11:30 p.m.Seattle/Tacoma Intl
7h 56m
1 stop
YOW10:26 a.m.Ottawa
C$ 465
Find similar

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 96,600 searches. Data last updated 14 October 2025.
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

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 9/4

12:00 p.m.-9:51 p.m.

1 stop12h 51m

Seattle/Tacoma Intl

Thu 16/4

5:50 a.m.-3:45 p.m.

1 stop6h 55m

C$ 360

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 19/11

7:45 a.m.-2:31 p.m.

1 stop9h 46m

Seattle/Tacoma Intl

Wed 26/11

5:50 a.m.-3:45 p.m.

1 stop6h 55m

C$ 366

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 18/11

4:10 p.m.-10:16 p.m.

1 stop9h 06m

Seattle/Tacoma Intl

Wed 26/11

5:50 a.m.-3:45 p.m.

1 stop6h 55m

C$ 374

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 13/11

6:00 a.m.-10:46 p.m.

1 stop19h 46m

Seattle/Tacoma Intl

Thu 20/11

5:50 a.m.-3:45 p.m.

1 stop6h 55m

C$ 378

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 20/11

11:10 a.m.-6:52 p.m.

1 stop10h 42m

Seattle/Tacoma Intl

Fri 28/11

7:00 a.m.-5:12 p.m.

1 stop7h 12m

C$ 387

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 31/10

11:10 a.m.-10:45 p.m.

1 stop14h 35m

Seattle/Tacoma Intl

Sun 2/11

11:52 p.m.-1:32 p.m.

1 stop10h 40m

C$ 391

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 13/11

6:00 a.m.-10:46 p.m.

1 stop19h 46m

Seattle/Tacoma Intl

Thu 20/11

5:50 a.m.-1:38 a.m.

2 stops16h 48m

C$ 420

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 23/11

6:00 a.m.-2:20 p.m.

1 stop11h 20m

Seattle/Tacoma Intl

Sun 30/11

3:10 p.m.-6:21 p.m.

2 stops24h 11m

C$ 436

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 9/4

5:40 a.m.-2:19 p.m.

2 stops11h 39m

Seattle/Tacoma Intl

Thu 16/4

3:10 p.m.-6:23 p.m.

2 stops24h 13m

C$ 447

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 31/10

6:45 a.m.-11:13 p.m.

2 stops19h 28m

Seattle/Tacoma Intl

Sat 1/11

12:59 a.m.-4:49 p.m.

2 stops13h 50m

C$ 660

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?

If you aren’t able to travel to Seattle during the month of September, then flying in October is also cheap. Prices for this month can be found on momondo for an average of C$ 537.

What is the cheapest day to depart on your flight to Seattle?

Our data shows that Thursday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 599. If your travel schedule is flexible, try to avoid departing on a Tuesday because tickets tend to average around C$ 681. These prices are subject to change though, so be sure to set up a Price Alert for flights to Seattle.

What is the cheapest time of day to depart on your flight to Seattle?

Our most recent data shows that the best time of day to fly to Seattle is in the evening. Flights from Ottawa to Seattle during this time can be as low as C$ 601. Flights at noon are often more expensive with an average ticket price of C$ 701.

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 C$ 595 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 C$ 433 on momondo.

How have Ottawa to Seattle flight prices changed over time?

As of October 2025, prices for Ottawa to Seattle flights are approximately 25% 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

Direct flights

None
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 3521.0 km. 9h 06m is a normal flight duration for this route.

  • 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 a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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
WestJetPriceFrom C$ 369Free CancellationRating
7.2
3,125 reviews
Search WestJet flights
Air CanadaPriceFrom C$ 412Free CancellationRating
7.1
10,297 reviews
Search Air Canada flights
United AirlinesPriceFrom C$ 426Free CancellationRating
7.4
8,976 reviews
Search United Airlines flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Lynnwood
Marysville
Tacoma
SeaTac
Kirkland
Redmond
Olympia
Ocean Shores
Shoreline
Ellensburg
Gig Harbor
Renton
Mukilteo
Cle Elum
Federal Way
Poulsbo
Puyallup
Shelton
Lakewood

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Seattle from Ottawa.

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

Yes. momondo enables you to select and highlight flights to Seattle from Ottawa with this policy.

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

momondo provides multiple filters to help you find the best flight to Seattle from Ottawa. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of Ottawa to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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