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Cheap flights from Ottawa to Seattle from C$ 179

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 29/9. 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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Cheap round-trip flights

WestJet Logo
7:15 p.m. - 12:35 p.m.YOW-SEA
20h 20m2 stops
WestJet Logo
1:50 p.m. - 12:40 a.m.SEA-YOW
7h 50m1 stop
C$ 350WestJet
Find Deal
Sat, 11 Oct - Wed, 22 Oct
United Airlines Logo
2:45 p.m. - 8:44 p.m.YOW-SEA
8h 59m1 stop
United Airlines Logo
7:00 a.m. - 5:06 p.m.SEA-YOW
7h 06m1 stop
C$ 352United Airlines
Find Deal
Sat, 11 Oct - Wed, 22 Oct
WestJet Logo
7:15 p.m. - 12:35 p.m.YOW-SEA
20h 20m2 stops
WestJet Logo
8:40 a.m. - 12:22 a.m.SEA-YOW
12h 42m2 stops
C$ 357WestJet
Find Deal
Sat, 11 Oct - Wed, 22 Oct
United Airlines Logo
7:29 p.m. - 9:59 a.m.YOW-SEA
17h 30m2 stops
United Airlines Logo
10:54 p.m. - 11:45 a.m.SEA-YOW
9h 51m1 stop
C$ 360United Airlines
Find Deal
Tue, 30 Sep - Sat, 4 Oct
United Airlines Logo
5:25 p.m. - 10:30 p.m.YOW-SEA
8h 05m1 stop
United Airlines Logo
3:48 p.m. - 10:26 a.m.SEA-YOW
15h 38m2 stops
C$ 372United Airlines
Find Deal
Fri, 17 Oct - Wed, 29 Oct
United Airlines Logo
5:15 a.m. - 6:49 p.m.YOW-SEA
16h 34m2 stops
United Airlines Logo
11:59 p.m. - 1:32 p.m.SEA-YOW
11h 33m2 stops
C$ 381United Airlines
Find Deal
Fri, 17 Oct - Sat, 1 Nov
United Airlines Logo
11:10 a.m. - 10:45 p.m.YOW-SEA
14h 35m1 stop
United Airlines Logo
7:00 a.m. - 5:12 p.m.SEA-YOW
7h 12m1 stop
C$ 383United Airlines
Find Deal
Wed, 29 Oct - Wed, 5 Nov
Air Canada Logo
6:00 p.m. - 10:31 p.m.YOW-SEA
7h 31m1 stop
Air Canada Logo
5:30 a.m. - 4:12 p.m.SEA-YOW
7h 42m1 stop
C$ 605Air Canada
Find Deal
Sun, 5 Oct - Sun, 12 Oct
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$ 657Air Canada
Find Deal
Thu, 30 Oct - Sat, 3 Jan
Delta Logo
7:50 a.m. - 12:59 p.m.YOW-SEA
8h 09m1 stop
Delta Logo
1:50 p.m. - 12:40 a.m.SEA-YOW
7h 50m1 stop
C$ 743Delta
Find Deal
Sun, 12 Oct - Thu, 23 Oct

WestJet flights from Ottawa to Seattle

Our best WestJet deals on Ottawa to Seattle flight tickets
WestJet
11 Oct
YOW7:15 p.m.Ottawa
20h 20m
2 stops
SEA12:35 p.m.Seattle/Tacoma Intl
22 Oct
SEA1:50 p.m.Seattle/Tacoma Intl
7h 50m
1 stop
YOW12:40 a.m.Ottawa
C$ 350
Find similar
WestJet
11 Oct
YOW7:15 p.m.Ottawa
20h 20m
2 stops
SEA12:35 p.m.Seattle/Tacoma Intl
22 Oct
SEA8:40 a.m.Seattle/Tacoma Intl
12h 42m
2 stops
YOW12:22 a.m.Ottawa
C$ 357
Find similar
WestJet
30 Oct
YOW5:40 a.m.Ottawa
11h 40m
2 stops
SEA2:20 p.m.Seattle/Tacoma Intl
4 Jan
SEA3:10 p.m.Seattle/Tacoma Intl
22h 43m
1 stop
YOW4:53 p.m.Ottawa
C$ 430
Find similar

United Airlines flights from Ottawa to Seattle

Our best United Airlines deals on Ottawa to Seattle flight tickets
United Airlines
11 Oct
YOW2:45 p.m.Ottawa
8h 59m
1 stop
SEA8:44 p.m.Seattle/Tacoma Intl
22 Oct
SEA7:00 a.m.Seattle/Tacoma Intl
7h 06m
1 stop
YOW5:06 p.m.Ottawa
C$ 352
Find similar
United Airlines
30 Sep
YOW7:29 p.m.Ottawa
17h 30m
2 stops
SEA9:59 a.m.Seattle/Tacoma Intl
4 Oct
SEA10:54 p.m.Seattle/Tacoma Intl
9h 51m
1 stop
YOW11:45 a.m.Ottawa
C$ 360
Find similar
United Airlines
17 Oct
YOW5:25 p.m.Ottawa
8h 05m
1 stop
SEA10:30 p.m.Seattle/Tacoma Intl
29 Oct
SEA3:48 p.m.Seattle/Tacoma Intl
15h 38m
2 stops
YOW10:26 a.m.Ottawa
C$ 372
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 15 September 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

Sat 11/10

7:15 p.m.-12:35 p.m.

2 stops20h 20m

Seattle/Tacoma Intl

Wed 22/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

C$ 350

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 11/10

2:45 p.m.-8:44 p.m.

1 stop8h 59m

Seattle/Tacoma Intl

Wed 22/10

7:00 a.m.-5:06 p.m.

1 stop7h 06m

C$ 352

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 11/10

7:15 p.m.-12:35 p.m.

2 stops20h 20m

Seattle/Tacoma Intl

Wed 22/10

8:40 a.m.-12:22 a.m.

2 stops12h 42m

C$ 357

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 30/9

7:29 p.m.-9:59 a.m.

2 stops17h 30m

Seattle/Tacoma Intl

Sat 4/10

10:54 p.m.-11:45 a.m.

1 stop9h 51m

C$ 360

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 17/10

5:25 p.m.-10:30 p.m.

1 stop8h 05m

Seattle/Tacoma Intl

Wed 29/10

3:48 p.m.-10:26 a.m.

2 stops15h 38m

C$ 372

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 17/10

5:15 a.m.-6:49 p.m.

2 stops16h 34m

Seattle/Tacoma Intl

Sat 1/11

11:59 p.m.-1:32 p.m.

2 stops11h 33m

C$ 381

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 29/10

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

1 stop14h 35m

Seattle/Tacoma Intl

Wed 5/11

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

1 stop7h 12m

C$ 383

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 5/10

6:00 p.m.-10:31 p.m.

1 stop7h 31m

Seattle/Tacoma Intl

Sun 12/10

5:30 a.m.-4:12 p.m.

1 stop7h 42m

C$ 605

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 30/10

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

1 stop9h 46m

Seattle/Tacoma Intl

Sat 3/1

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

1 stop6h 55m

C$ 657

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 12/10

7:50 a.m.-12:59 p.m.

1 stop8h 09m

Seattle/Tacoma Intl

Thu 23/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

C$ 743

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 August is also cheap. Prices for this month can be found on momondo for an average of C$ 566.

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$ 591. If your travel schedule is flexible, try to avoid departing on a Tuesday because tickets tend to average around C$ 672. 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$ 594. Flights at noon are often more expensive with an average ticket price of C$ 692.

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$ 592 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$ 428 on momondo.

How have Ottawa to Seattle flight prices changed over time?

As of September 2025, prices for Ottawa to Seattle flights are approximately 22% 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.
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  • How far is Ottawa to Seattle/Tacoma Intl by plane?

    The distance between Ottawa and Seattle/Tacoma Intl is about 3521.0 km. 7h 31m 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$ 365Free CancellationRating
7.2
3,091 reviews
Search WestJet flights
Air CanadaPriceFrom C$ 407Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
United AirlinesPriceFrom C$ 420Free CancellationRating
7.4
8,929 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
Tukwila
Gig Harbor
Renton
Mukilteo
Cle Elum
Poulsbo
Puyallup
Federal Way
Kent

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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