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

Air Canada, WestJet, 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 65% 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 December 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.

$142 Cheap Flights from Ottawa to Seattle in 2025/26

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Find the cheapest flights from Ottawa to Seattle

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:40 am - 2:19 pm

YOW

SEA

11h 39m2 stops

3:10 pm - 4:53 pm

SEA

YOW

22h 43m1 stop

$247WestJet

Wed, Apr 8 - Tue, Apr 14

5:40 am - 2:19 pm

YOW

SEA

11h 39m2 stops

3:10 pm - 12:39 am

SEA

YOW

30h 29m2 stops

$251WestJet

Wed, Apr 8 - Tue, Apr 14

5:50 pm - 10:51 pm

YOW

SEA

8h 01m1 stop

8:10 am - 7:18 pm

SEA

YOW

8h 08m1 stop

$260Air Canada

Mon, Feb 9 - Mon, Feb 16

5:45 pm - 2:19 pm

YOW

SEA

23h 34m1 stop

3:10 pm - 4:53 pm

SEA

YOW

22h 43m1 stop

$262WestJet

Wed, Apr 8 - Tue, Apr 14

5:45 pm - 2:19 pm

YOW

SEA

23h 34m1 stop

3:10 pm - 4:53 pm

SEA

YOW

22h 43m1 stop

$263WestJet

Wed, Apr 8 - Tue, Apr 14

2:05 pm - 10:51 pm

YOW

SEA

11h 46m2 stops

8:00 pm - 6:43 am

SEA

YOW

7h 43m1 stop

$267Air Canada

Mon, Feb 9 - Mon, Feb 16

5:50 pm - 10:51 pm

YOW

SEA

8h 01m1 stop

5:50 am - 3:45 pm

SEA

YOW

6h 55m1 stop

$271Air Canada

Tue, Feb 10 - Wed, Feb 18

5:40 am - 2:20 pm

YOW

SEA

11h 40m2 stops

7:55 pm - 2:45 pm

SEA

YOW

15h 50m1 stop

$287Multiple Airlines

Thu, Jan 22 - Thu, Jan 29

9:45 am - 9:15 pm

YOW

SEA

14h 30m2 stops

7:00 am - 5:12 pm

SEA

YOW

7h 12m1 stop

$290United Airlines

Fri, Jan 9 - Mon, Jan 12

2:15 pm - 8:57 pm

YOW

SEA

9h 42m1 stop

11:45 pm - 1:32 pm

SEA

YOW

10h 47m1 stop

$291United Airlines

Tue, Feb 3 - Wed, Feb 4

WestJet flights from Ottawa to Seattle

Our best WestJet deals on Ottawa to Seattle flight tickets

WestJet

Apr 8

YOW5:40 amOttawa

11h 39m

2 stops

SEA2:19 pmSeattle/Tacoma Intl

Apr 14

SEA3:10 pmSeattle/Tacoma Intl

22h 43m

1 stop

YOW4:53 pmOttawa

$247

Find similar

WestJet

Apr 8

YOW5:40 amOttawa

11h 39m

2 stops

SEA2:19 pmSeattle/Tacoma Intl

Apr 14

SEA3:10 pmSeattle/Tacoma Intl

30h 29m

2 stops

YOW12:39 amOttawa

$251

Find similar

WestJet

May 30

YOW6:15 amOttawa

9h 53m

2 stops

SEA1:08 pmSeattle/Tacoma Intl

Jun 11

SEA7:05 amSeattle/Tacoma Intl

8h 20m

1 stop

YOW6:25 pmOttawa

$252

Find similar

Air Canada flights from Ottawa to Seattle

Our best Air Canada deals on Ottawa to Seattle flight tickets

Air Canada

Feb 9

YOW5:50 pmOttawa

8h 01m

1 stop

SEA10:51 pmSeattle/Tacoma Intl

Feb 16

SEA8:10 amSeattle/Tacoma Intl

8h 08m

1 stop

YOW7:18 pmOttawa

$260

Find similar

Air Canada

Feb 9

YOW2:05 pmOttawa

11h 46m

2 stops

SEA10:51 pmSeattle/Tacoma Intl

Feb 16

SEA8:00 pmSeattle/Tacoma Intl

7h 43m

1 stop

YOW6:43 amOttawa

$267

Find similar

Air Canada

Feb 10

YOW5:50 pmOttawa

8h 01m

1 stop

SEA10:51 pmSeattle/Tacoma Intl

Feb 18

SEA5:50 amSeattle/Tacoma Intl

6h 55m

1 stop

YOW3:45 pmOttawa

$271

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 4/8

5:40 am-2:19 pm

2 stops11h 39m

Seattle/Tacoma Intl

Tue 4/14

3:10 pm-4:53 pm

1 stop22h 43m

$247

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 4/8

5:40 am-2:19 pm

2 stops11h 39m

Seattle/Tacoma Intl

Tue 4/14

3:10 pm-12:39 am

2 stops30h 29m

$251

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 2/9

5:50 pm-10:51 pm

1 stop8h 01m

Seattle/Tacoma Intl

Mon 2/16

8:10 am-7:18 pm

1 stop8h 08m

$260

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 4/8

5:45 pm-2:19 pm

1 stop23h 34m

Seattle/Tacoma Intl

Tue 4/14

3:10 pm-4:53 pm

1 stop22h 43m

$262

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 4/8

5:45 pm-2:19 pm

1 stop23h 34m

Seattle/Tacoma Intl

Tue 4/14

3:10 pm-4:53 pm

1 stop22h 43m

$263

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 2/9

2:05 pm-10:51 pm

2 stops11h 46m

Seattle/Tacoma Intl

Mon 2/16

8:00 pm-6:43 am

1 stop7h 43m

$267

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 2/10

5:50 pm-10:51 pm

1 stop8h 01m

Seattle/Tacoma Intl

Wed 2/18

5:50 am-3:45 pm

1 stop6h 55m

$271

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 1/22

5:40 am-2:20 pm

2 stops11h 40m

Seattle/Tacoma Intl

Thu 1/29

7:55 pm-2:45 pm

1 stop15h 50m

$287

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 1/9

9:45 am-9:15 pm

2 stops14h 30m

Seattle/Tacoma Intl

Mon 1/12

7:00 am-5:12 pm

1 stop7h 12m

$290

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 2/3

2:15 pm-8:57 pm

1 stop9h 42m

Seattle/Tacoma Intl

Wed 2/4

11:45 pm-1:32 pm

1 stop10h 47m

$291

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 January to fly from Ottawa, when ticket prices are also cheap, with an average price of $355.

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 $413 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 65% 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 December 2025, prices for Ottawa to Seattle flights are approximately 18% 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

Fastest flight time	9h 42m
Direct flights	None

The fastest flight from Ottawa to Seattle takes 9h 42m

There are no direct flights from Ottawa to Seattle. There are no popular flight routes from Ottawa to Seattle.

Search flight deals

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 42m, 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 December 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 44% of all bookings. The subsequent popular airlines are WestJet at 37% 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
United Airlines	PriceFrom $275	Free Cancellation	Rating 7.4 9,116 reviews	Search United Airlines flights
WestJet	PriceFrom $277	Free Cancellation	Rating 7.2 3,219 reviews	Search WestJet flights
Air Canada	PriceFrom $290	Free Cancellation	Rating 7.1 10,562 reviews	Search Air Canada flights

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Redmond

Tukwila

Federal Way

Cle Elum

Lakewood

Fife

Centralia

Westport

Kirkland

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.