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Cheap flights from Ottawa to Seattle from $218

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 12/12. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
6:00 am - 2:38 pmYOW-SEA
11h 38m1 stop
WestJet Logo
3:10 pm - 4:53 pmSEA-YOW
22h 43m1 stop
$251WestJet
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Sat, Jan 24 - Wed, Jan 28
WestJet Logo
6:00 am - 2:38 pmYOW-SEA
11h 38m1 stop
WestJet Logo
3:10 pm - 12:42 amSEA-YOW
30h 32m2 stops
$265WestJet
Find Deal
Sat, Jan 24 - Wed, Jan 28
Air Canada Logo
5:50 pm - 10:08 pmYOW-SEA
7h 18m1 stop
Air Canada Logo
8:00 pm - 6:43 amSEA-YOW
7h 43m1 stop
$303Air Canada
Find Deal
Tue, Apr 14 - Wed, Apr 15
Air Canada Logo
5:50 pm - 10:08 pmYOW-SEA
7h 18m1 stop
Air Canada Logo
8:00 pm - 6:43 amSEA-YOW
7h 43m1 stop
$304Air Canada
Find Deal
Tue, Apr 14 - Wed, Apr 15
United Airlines Logo
6:00 am - 10:18 pmYOW-SEA
19h 18m2 stops
United Airlines Logo
11:50 pm - 1:45 pmSEA-YOW
10h 55m1 stop
$309United Airlines
Find Deal
Tue, Apr 14 - Wed, Apr 15
Multiple Airlines Logo
5:40 am - 7:17 pmYOW-SEA
16h 37m1 stop
Multiple Airlines Logo
7:54 pm - 2:44 pmSEA-YOW
15h 50m1 stop
$377Multiple Airlines
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Wed, Nov 26 - Tue, Dec 2
Multiple Airlines Logo
5:40 am - 7:17 pmYOW-SEA
16h 37m1 stop
Multiple Airlines Logo
11:05 pm - 12:40 amSEA-YOW
22h 35m2 stops
$406Multiple Airlines
Find Deal
Wed, Nov 26 - Tue, Dec 2
United Airlines Logo
6:20 am - 10:30 pmYOW-SEA
19h 10m2 stops
United Airlines Logo
3:45 pm - 10:26 amSEA-YOW
15h 41m2 stops
$511United Airlines
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Wed, Nov 26 - Tue, Dec 2
American Airlines Logo
6:45 am - 8:59 pmYOW-SEA
17h 14m2 stops
American Airlines Logo
12:59 am - 12:41 amSEA-YOW
20h 42m2 stops
$535American Airlines
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Wed, Nov 26 - Mon, Dec 1
American Airlines Logo
6:45 am - 8:59 pmYOW-SEA
17h 14m2 stops
American Airlines Logo
12:59 am - 4:49 pmSEA-YOW
12h 50m2 stops
$615American Airlines
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Fri, Nov 21 - Thu, Nov 27

Air Canada flights from Ottawa to Seattle

Our best Air Canada deals on Ottawa to Seattle flight tickets
Air Canada
Apr 14
YOW5:50 pmOttawa
7h 18m
1 stop
SEA10:08 pmSeattle/Tacoma Intl
Apr 15
SEA8:00 pmSeattle/Tacoma Intl
7h 43m
1 stop
YOW6:43 amOttawa
$303
Find similar
Air Canada
Apr 14
YOW5:50 pmOttawa
7h 18m
1 stop
SEA10:08 pmSeattle/Tacoma Intl
Apr 15
SEA8:00 pmSeattle/Tacoma Intl
7h 43m
1 stop
YOW6:43 amOttawa
$304
Find similar
Air Canada
Apr 14
YOW5:45 amOttawa
16h 33m
2 stops
SEA7:18 pmSeattle/Tacoma Intl
Apr 15
SEA10:10 amSeattle/Tacoma Intl
12h 24m
2 stops
YOW1:34 amOttawa
$340
Find similar

United Airlines flights from Ottawa to Seattle

Our best United Airlines deals on Ottawa to Seattle flight tickets
United Airlines
Apr 14
YOW6:00 amOttawa
19h 18m
2 stops
SEA10:18 pmSeattle/Tacoma Intl
Apr 15
SEA11:50 pmSeattle/Tacoma Intl
10h 55m
1 stop
YOW1:45 pmOttawa
$309
Find similar
United Airlines
Nov 26
YOW6:20 amOttawa
19h 10m
2 stops
SEA10:30 pmSeattle/Tacoma Intl
Dec 2
SEA3:45 pmSeattle/Tacoma Intl
15h 41m
2 stops
YOW10:26 amOttawa
$511
Find similar
United Airlines
Dec 24
YOW7:27 pmOttawa
21h 31m
2 stops
SEA1:58 pmSeattle/Tacoma Intl
Dec 29
SEA3:50 pmSeattle/Tacoma Intl
22h 28m
2 stops
YOW5:18 pmOttawa
$547
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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 November 6, 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 1/24

6:00 am-2:38 pm

1 stop11h 38m

Seattle/Tacoma Intl

Wed 1/28

3:10 pm-4:53 pm

1 stop22h 43m

$251

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 1/24

6:00 am-2:38 pm

1 stop11h 38m

Seattle/Tacoma Intl

Wed 1/28

3:10 pm-12:42 am

2 stops30h 32m

$265

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 4/14

5:50 pm-10:08 pm

1 stop7h 18m

Seattle/Tacoma Intl

Wed 4/15

8:00 pm-6:43 am

1 stop7h 43m

$303

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 4/14

5:50 pm-10:08 pm

1 stop7h 18m

Seattle/Tacoma Intl

Wed 4/15

8:00 pm-6:43 am

1 stop7h 43m

$304

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 4/14

6:00 am-10:18 pm

2 stops19h 18m

Seattle/Tacoma Intl

Wed 4/15

11:50 pm-1:45 pm

1 stop10h 55m

$309

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 11/26

5:40 am-7:17 pm

1 stop16h 37m

Seattle/Tacoma Intl

Tue 12/2

7:54 pm-2:44 pm

1 stop15h 50m

$377

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 11/26

5:40 am-7:17 pm

1 stop16h 37m

Seattle/Tacoma Intl

Tue 12/2

11:05 pm-12:40 am

2 stops22h 35m

$406

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 11/26

6:20 am-10:30 pm

2 stops19h 10m

Seattle/Tacoma Intl

Tue 12/2

3:45 pm-10:26 am

2 stops15h 41m

$511

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 11/26

6:45 am-8:59 pm

2 stops17h 14m

Seattle/Tacoma Intl

Mon 12/1

12:59 am-12:41 am

2 stops20h 42m

$535

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 11/21

6:45 am-8:59 pm

2 stops17h 14m

Seattle/Tacoma Intl

Thu 11/27

12:59 am-4:49 pm

2 stops12h 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 $340. If you don’t want to visit Seattle in September, then you should wait until October to fly from Ottawa, when ticket prices are also cheap, with an average price of $384.

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 $422 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 26% 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 November 2025, prices for Ottawa to Seattle flights are approximately 0% 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

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 18m, 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
9,007 reviews
Search United Airlines flights
WestJetPriceFrom $277Free CancellationRating
7.2
3,155 reviews
Search WestJet flights
Air CanadaPriceFrom $290Free CancellationRating
7.1
10,416 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
Puyallup
Marysville
Redmond
Tukwila
Lakewood
Federal Way
Fife
Cle Elum
Centralia
Kirkland
Westport
Shoreline

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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