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Cheap flights from Ottawa to Seattle from $129

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 9/29. 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
0 bags

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Find the cheapest flights from Ottawa to Seattle

Cheap round-trip flights

United Airlines Logo
7:29 pm - 9:59 amYOW-SEA
17h 30m2 stops
United Airlines Logo
10:54 pm - 11:45 amSEA-YOW
9h 51m1 stop
$260United Airlines
Find Deal
Tue, Sep 30 - Sat, Oct 4
United Airlines Logo
5:25 pm - 10:30 pmYOW-SEA
8h 05m1 stop
United Airlines Logo
3:48 pm - 10:26 amSEA-YOW
15h 38m2 stops
$269United Airlines
Find Deal
Fri, Oct 17 - Wed, Oct 29
WestJet Logo
5:40 am - 2:20 pmYOW-SEA
11h 40m2 stops
WestJet Logo
3:10 pm - 4:53 pmSEA-YOW
22h 43m1 stop
$311WestJet
Find Deal
Thu, Oct 30 - Sun, Jan 4
WestJet Logo
5:45 pm - 2:20 pmYOW-SEA
23h 35m1 stop
WestJet Logo
3:10 pm - 4:53 pmSEA-YOW
22h 43m1 stop
$325WestJet
Find Deal
Thu, Oct 30 - Sun, Jan 4
Logo
6:00 am - 10:41 pmYOW-SEA
19h 41m1 stop
Logo
5:50 am - 3:45 pmSEA-YOW
6h 55m1 stop
$431
Find Deal
Thu, Oct 30 - Sat, Jan 3
Air Canada Logo
6:00 pm - 10:31 pmYOW-SEA
7h 31m1 stop
Air Canada Logo
5:30 am - 4:12 pmSEA-YOW
7h 42m1 stop
$437Air Canada
Find Deal
Sun, Oct 5 - Sun, Oct 12
Logo
10:00 am - 7:16 pmYOW-SEA
12h 16m2 stops
Logo
10:05 am - 12:40 amSEA-YOW
11h 35m3 stops
$441
Find Deal
Wed, Oct 29 - Wed, Nov 5
Air Canada Logo
7:45 am - 2:31 pmYOW-SEA
9h 46m1 stop
Air Canada Logo
5:50 am - 3:45 pmSEA-YOW
6h 55m1 stop
$475Air Canada
Find Deal
Thu, Oct 30 - Sat, Jan 3
Delta Logo
7:50 am - 12:59 pmYOW-SEA
8h 09m1 stop
Delta Logo
1:50 pm - 12:40 amSEA-YOW
7h 50m1 stop
$537Delta
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Sun, Oct 12 - Thu, Oct 23
Delta Logo
5:55 am - 8:20 pmYOW-SEA
17h 25m2 stops
Delta Logo
1:50 pm - 12:40 amSEA-YOW
7h 50m1 stop
$615Delta
Find Deal
Sun, Oct 12 - Thu, Oct 23

WestJet flights from Ottawa to Seattle

Our best WestJet deals on Ottawa to Seattle flight tickets
WestJet
Oct 30
YOW5:40 amOttawa
11h 40m
2 stops
SEA2:20 pmSeattle/Tacoma Intl
Jan 4
SEA3:10 pmSeattle/Tacoma Intl
22h 43m
1 stop
YOW4:53 pmOttawa
$311
Find similar
WestJet
Oct 30
YOW5:45 pmOttawa
23h 35m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
Jan 4
SEA3:10 pmSeattle/Tacoma Intl
22h 43m
1 stop
YOW4:53 pmOttawa
$325
Find similar
WestJet
Oct 30
YOW5:45 pmOttawa
19h 40m
2 stops
SEA10:25 amSeattle/Tacoma Intl
Jan 4
SEA3:10 pmSeattle/Tacoma Intl
22h 43m
1 stop
YOW4:53 pmOttawa
$335
Find similar

Delta flights from Ottawa to Seattle

Our best Delta deals on Ottawa to Seattle flight tickets
Delta
Oct 12
YOW7:50 amOttawa
8h 09m
1 stop
SEA12:59 pmSeattle/Tacoma Intl
Oct 23
SEA1:50 pmSeattle/Tacoma Intl
7h 50m
1 stop
YOW12:40 amOttawa
$537
Find similar
Delta
Oct 12
YOW5:55 amOttawa
17h 25m
2 stops
SEA8:20 pmSeattle/Tacoma Intl
Oct 23
SEA1:50 pmSeattle/Tacoma Intl
7h 50m
1 stop
YOW12:40 amOttawa
$615
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 832,500 searches. Data last updated September 15, 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

Tue 9/30

7:29 pm-9:59 am

2 stops17h 30m

Seattle/Tacoma Intl

Sat 10/4

10:54 pm-11:45 am

1 stop9h 51m

$260

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 10/17

5:25 pm-10:30 pm

1 stop8h 05m

Seattle/Tacoma Intl

Wed 10/29

3:48 pm-10:26 am

2 stops15h 38m

$269

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 10/30

5:40 am-2:20 pm

2 stops11h 40m

Seattle/Tacoma Intl

Sun 1/4

3:10 pm-4:53 pm

1 stop22h 43m

$311

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 10/30

5:45 pm-2:20 pm

1 stop23h 35m

Seattle/Tacoma Intl

Sun 1/4

3:10 pm-4:53 pm

1 stop22h 43m

$325

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 10/30

6:00 am-10:41 pm

1 stop19h 41m

Seattle/Tacoma Intl

Sat 1/3

5:50 am-3:45 pm

1 stop6h 55m

$431

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 10/5

6:00 pm-10:31 pm

1 stop7h 31m

Seattle/Tacoma Intl

Sun 10/12

5:30 am-4:12 pm

1 stop7h 42m

$437

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 10/29

10:00 am-7:16 pm

2 stops12h 16m

Seattle/Tacoma Intl

Wed 11/5

10:05 am-12:40 am

3 stops11h 35m

$441

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 10/30

7:45 am-2:31 pm

1 stop9h 46m

Seattle/Tacoma Intl

Sat 1/3

5:50 am-3:45 pm

1 stop6h 55m

$475

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 10/12

7:50 am-12:59 pm

1 stop8h 09m

Seattle/Tacoma Intl

Thu 10/23

1:50 pm-12:40 am

1 stop7h 50m

$537

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 10/12

5:55 am-8:20 pm

2 stops17h 25m

Seattle/Tacoma Intl

Thu 10/23

1:50 pm-12:40 am

1 stop7h 50m

$615

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, September 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 $363. If you don’t want to visit Seattle in September, then you should wait until August to fly from Ottawa, when ticket prices are also cheap, with an average price of $409.

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

On average, the least expensive day to fly to Seattle from Ottawa is on a Saturday. momondo users have found tickets for Saturday departures for as low as $422. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from Ottawa because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $577.

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

Flying to Seattle from Ottawa in the evening is the least expensive time of day to depart. momondo users have found prices as low as $433 when looking at flights departing in the evening. Flights to Seattle are more costly at noon, with an average ticket price of $597. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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 $428 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 42% 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 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 2187.8 mi. Flights usually cover this in 7h 31m, 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
WestJetPriceFrom $277Free CancellationRating
7.2
3,091 reviews
Search WestJet flights
Air CanadaPriceFrom $304Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
United AirlinesPriceFrom $361Free CancellationRating
7.4
8,931 reviews
Search United Airlines flights

Traveling to a place near Seattle?

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