What is the cheapest airline that flies from Ottawa to Seattle/Tacoma Intl?

United Airlines, Air Canada, and WestJet are the most popular carriers operating from Ottawa to Seattle/Tacoma Intl

What airlines fly to Seattle?

Air Canada, WestJet and United Airlines are the top three most popular airlines that fly to Seattle from Ottawa according to our data. Air Canada is the first choice among our users, with 57% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 3 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

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?

As of November 2025, there are 3 operators available to choose from 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.

$232 Cheap Flights from Ottawa to Seattle in 2025/26

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Find the cheapest flights from Ottawa to Seattle

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Cheap round-trip flights

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5:40 am - 2:20 pmYOW-SEA

11h 40m2 stops

3:10 pm - 4:53 pmSEA-YOW

22h 43m1 stop

$273WestJet

Find Deal

Fri, Dec 12 - Sun, Dec 14

5:40 am - 2:20 pmYOW-SEA

11h 40m2 stops

3:10 pm - 12:42 amSEA-YOW

30h 32m2 stops

$278WestJet

Find Deal

Fri, Dec 12 - Sun, Dec 14

6:00 am - 2:20 pmYOW-SEA

11h 20m1 stop

3:10 pm - 6:21 pmSEA-YOW

24h 11m2 stops

$287WestJet

Find Deal

Fri, Dec 12 - Sun, Dec 14

6:00 am - 2:20 pmYOW-SEA

11h 20m1 stop

3:10 pm - 4:53 pmSEA-YOW

22h 43m1 stop

$295WestJet

Find Deal

Fri, Dec 12 - Sun, Dec 14

6:00 am - 2:20 pmYOW-SEA

11h 20m1 stop

3:10 pm - 4:53 pmSEA-YOW

22h 43m1 stop

$299WestJet

Find Deal

Thu, Dec 11 - Sun, Dec 14

5:40 am - 2:20 pmYOW-SEA

11h 40m2 stops

3:10 pm - 12:42 amSEA-YOW

30h 32m2 stops

$301WestJet

Find Deal

Tue, Nov 25 - Fri, Nov 28

5:50 pm - 10:08 pmYOW-SEA

7h 18m1 stop

8:00 pm - 6:45 amSEA-YOW

7h 45m1 stop

$305Air Canada

Find Deal

Tue, Apr 14 - Wed, Apr 15

5:40 am - 2:20 pmYOW-SEA

11h 40m2 stops

3:10 pm - 6:21 pmSEA-YOW

24h 11m2 stops

$310WestJet

Find Deal

Mon, Nov 24 - Thu, Nov 27

5:50 pm - 10:08 pmYOW-SEA

7h 18m1 stop

10:10 am - 1:34 amSEA-YOW

12h 24m2 stops

$312Air Canada

Find Deal

Tue, Apr 14 - Wed, Apr 15

6:00 am - 2:20 pmYOW-SEA

11h 20m1 stop

3:10 pm - 4:53 pmSEA-YOW

22h 43m1 stop

$321WestJet

Find Deal

Thu, Dec 11 - Sun, Dec 14

WestJet flights from Ottawa to Seattle

Our best WestJet deals on Ottawa to Seattle flight tickets

WestJet

Dec 12

YOW5:40 amOttawa

11h 40m

2 stops

SEA2:20 pmSeattle/Tacoma Intl

Dec 14

SEA3:10 pmSeattle/Tacoma Intl

22h 43m

1 stop

YOW4:53 pmOttawa

$273

Find similar

WestJet

Dec 12

YOW5:40 amOttawa

11h 40m

2 stops

SEA2:20 pmSeattle/Tacoma Intl

Dec 14

SEA3:10 pmSeattle/Tacoma Intl

30h 32m

2 stops

YOW12:42 amOttawa

$278

Find similar

WestJet

Dec 12

YOW6:00 amOttawa

11h 20m

1 stop

SEA2:20 pmSeattle/Tacoma Intl

Dec 14

SEA3:10 pmSeattle/Tacoma Intl

24h 11m

2 stops

YOW6:21 pmOttawa

$287

Find similar

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 45m

1 stop

YOW6:45 amOttawa

$305

Find similar

Air Canada

Apr 14

YOW5:50 pmOttawa

7h 18m

1 stop

SEA10:08 pmSeattle/Tacoma Intl

Apr 15

SEA10:10 amSeattle/Tacoma Intl

12h 24m

2 stops

YOW1:34 amOttawa

$312

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

$343

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 12/12

5:40 am-2:20 pm

2 stops11h 40m

Seattle/Tacoma Intl

Sun 12/14

3:10 pm-4:53 pm

1 stop22h 43m

$273

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 12/12

5:40 am-2:20 pm

2 stops11h 40m

Seattle/Tacoma Intl

Sun 12/14

3:10 pm-12:42 am

2 stops30h 32m

$278

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 12/12

6:00 am-2:20 pm

1 stop11h 20m

Seattle/Tacoma Intl

Sun 12/14

3:10 pm-6:21 pm

2 stops24h 11m

$287

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 12/12

6:00 am-2:20 pm

1 stop11h 20m

Seattle/Tacoma Intl

Sun 12/14

3:10 pm-4:53 pm

1 stop22h 43m

$295

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 12/11

6:00 am-2:20 pm

1 stop11h 20m

Seattle/Tacoma Intl

Sun 12/14

3:10 pm-4:53 pm

1 stop22h 43m

$299

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 11/25

5:40 am-2:20 pm

2 stops11h 40m

Seattle/Tacoma Intl

Fri 11/28

3:10 pm-12:42 am

2 stops30h 32m

$301

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-6:45 am

1 stop7h 45m

$305

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 11/24

5:40 am-2:20 pm

2 stops11h 40m

Seattle/Tacoma Intl

Thu 11/27

3:10 pm-6:21 pm

2 stops24h 11m

$310

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 4/14

5:50 pm-10:08 pm

1 stop7h 18m

Seattle/Tacoma Intl

Wed 4/15

10:10 am-1:34 am

2 stops12h 24m

$312

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 12/11

6:00 am-2:20 pm

1 stop11h 20m

Seattle/Tacoma Intl

Sun 12/14

3:10 pm-4:53 pm

1 stop22h 43m

$321

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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 $386.

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 $420 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 29% 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 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?
As of November 2025, there are 3 operators available to choose from 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?
momondo data reveals that the most frequently booked airline on the route from Ottawa to Seattle is Air Canada, representing 43% of all bookings. The subsequent popular airlines are WestJet at 36% and United Airlines at 21%.

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 Airlines	PriceFrom $275	Free Cancellation	Rating 7.4 9,017 reviews	Search United Airlines flights
WestJet	PriceFrom $277	Free Cancellation	Rating 7.2 3,161 reviews	Search WestJet flights
Air Canada	PriceFrom $290	Free Cancellation	Rating 7.1 10,448 reviews	Search Air Canada flights

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SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Puyallup

Marysville

Redmond

Tukwila

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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.