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

WestJet, Air Canada, and United Airlines 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 October 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.

$158 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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One-way

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Cheap round-trip flights

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12:00 pm - 9:51 pmYOW-SEA

12h 51m1 stop

5:50 am - 3:45 pmSEA-YOW

6h 55m1 stop

$257Air Canada

Find Deal

Thu, Apr 9 - Thu, Apr 16

7:45 am - 2:31 pmYOW-SEA

9h 46m1 stop

5:50 am - 3:45 pmSEA-YOW

6h 55m1 stop

$261Air Canada

Find Deal

Wed, Nov 19 - Fri, Nov 28

4:10 pm - 10:16 pmYOW-SEA

9h 06m1 stop

5:50 am - 3:45 pmSEA-YOW

6h 55m1 stop

$267Air Canada

Find Deal

Tue, Nov 18 - Fri, Nov 28

6:00 am - 10:46 pmYOW-SEA

19h 46m1 stop

5:50 am - 3:45 pmSEA-YOW

6h 55m1 stop

$270Multiple Airlines

Find Deal

Thu, Nov 13 - Thu, Nov 20

11:10 am - 6:52 pmYOW-SEA

10h 42m1 stop

7:00 am - 5:12 pmSEA-YOW

7h 12m1 stop

$276United Airlines

Find Deal

Thu, Nov 20 - Fri, Nov 28

11:10 am - 10:45 pmYOW-SEA

14h 35m1 stop

11:52 pm - 1:32 pmSEA-YOW

10h 40m1 stop

$279United Airlines

Find Deal

Fri, Oct 31 - Sun, Nov 2

6:00 am - 10:46 pmYOW-SEA

19h 46m1 stop

5:50 am - 1:38 amSEA-YOW

16h 48m2 stops

$300Multiple Airlines

Find Deal

Thu, Nov 13 - Thu, Nov 20

6:00 am - 2:20 pmYOW-SEA

11h 20m1 stop

3:10 pm - 6:21 pmSEA-YOW

24h 11m2 stops

$311WestJet

Find Deal

Sun, Nov 23 - Sun, Nov 30

5:40 am - 2:19 pmYOW-SEA

11h 39m2 stops

3:10 pm - 6:23 pmSEA-YOW

24h 13m2 stops

$319WestJet

Find Deal

Thu, Apr 9 - Thu, Apr 16

6:45 am - 11:13 pmYOW-SEA

19h 28m2 stops

12:59 am - 4:49 pmSEA-YOW

13h 50m2 stops

$471American Airlines

Find Deal

Fri, Oct 31 - Sat, Nov 1

Air Canada flights from Ottawa to Seattle

Our best Air Canada deals on Ottawa to Seattle flight tickets

Air Canada

Apr 9

YOW12:00 pmOttawa

12h 51m

1 stop

SEA9:51 pmSeattle/Tacoma Intl

Apr 16

SEA5:50 amSeattle/Tacoma Intl

6h 55m

1 stop

YOW3:45 pmOttawa

$257

Find similar

Air Canada

Nov 19

YOW7:45 amOttawa

9h 46m

1 stop

SEA2:31 pmSeattle/Tacoma Intl

Nov 28

SEA5:50 amSeattle/Tacoma Intl

6h 55m

1 stop

YOW3:45 pmOttawa

$261

Find similar

Air Canada

Nov 18

YOW4:10 pmOttawa

9h 06m

1 stop

SEA10:16 pmSeattle/Tacoma Intl

Nov 28

SEA5:50 amSeattle/Tacoma Intl

6h 55m

1 stop

YOW3:45 pmOttawa

$267

Find similar

United Airlines flights from Ottawa to Seattle

Our best United Airlines deals on Ottawa to Seattle flight tickets

United Airlines

Nov 20

YOW11:10 amOttawa

10h 42m

1 stop

SEA6:52 pmSeattle/Tacoma Intl

Nov 28

SEA7:00 amSeattle/Tacoma Intl

7h 12m

1 stop

YOW5:12 pmOttawa

$276

Find similar

United Airlines

Oct 31

YOW11:10 amOttawa

14h 35m

1 stop

SEA10:45 pmSeattle/Tacoma Intl

Nov 2

SEA11:52 pmSeattle/Tacoma Intl

10h 40m

1 stop

YOW1:32 pmOttawa

$279

Find similar

United Airlines

Nov 7

YOW10:30 amOttawa

27h 05m

2 stops

SEA10:35 amSeattle/Tacoma Intl

Nov 15

SEA11:30 pmSeattle/Tacoma Intl

7h 56m

1 stop

YOW10:26 amOttawa

$332

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 4/9

12:00 pm-9:51 pm

1 stop12h 51m

Seattle/Tacoma Intl

Thu 4/16

5:50 am-3:45 pm

1 stop6h 55m

$257

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 11/19

7:45 am-2:31 pm

1 stop9h 46m

Seattle/Tacoma Intl

Fri 11/28

5:50 am-3:45 pm

1 stop6h 55m

$261

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 11/18

4:10 pm-10:16 pm

1 stop9h 06m

Seattle/Tacoma Intl

Fri 11/28

5:50 am-3:45 pm

1 stop6h 55m

$267

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 11/13

6:00 am-10:46 pm

1 stop19h 46m

Seattle/Tacoma Intl

Thu 11/20

5:50 am-3:45 pm

1 stop6h 55m

$270

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 11/20

11:10 am-6:52 pm

1 stop10h 42m

Seattle/Tacoma Intl

Fri 11/28

7:00 am-5:12 pm

1 stop7h 12m

$276

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 10/31

11:10 am-10:45 pm

1 stop14h 35m

Seattle/Tacoma Intl

Sun 11/2

11:52 pm-1:32 pm

1 stop10h 40m

$279

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 11/13

6:00 am-10:46 pm

1 stop19h 46m

Seattle/Tacoma Intl

Thu 11/20

5:50 am-1:38 am

2 stops16h 48m

$300

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 11/23

6:00 am-2:20 pm

1 stop11h 20m

Seattle/Tacoma Intl

Sun 11/30

3:10 pm-6:21 pm

2 stops24h 11m

$311

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 4/9

5:40 am-2:19 pm

2 stops11h 39m

Seattle/Tacoma Intl

Thu 4/16

3:10 pm-6:23 pm

2 stops24h 13m

$319

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 10/31

6:45 am-11:13 pm

2 stops19h 28m

Seattle/Tacoma Intl

Sat 11/1

12:59 am-4:49 pm

2 stops13h 50m

$471

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 $383.

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 $425 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 34% 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 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.

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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 9h 06m, 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 October 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 41% of all bookings. The subsequent popular airlines are WestJet at 39% and United Airlines at 20%.

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
WestJet	PriceFrom $277	Free Cancellation	Rating 7.2 3,125 reviews	Search WestJet flights
Air Canada	PriceFrom $304	Free Cancellation	Rating 7.1 10,297 reviews	Search Air Canada flights
United Airlines	PriceFrom $323	Free Cancellation	Rating 7.4 8,976 reviews	Search United Airlines flights

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Federal Way

Tukwila

Kirkland

Fife

Centralia

Lakewood

Shoreline

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.