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

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

Which layover airport has the shortest travel time from Ottawa to Seattle?

Flights connecting via Vancouver (YVR) have the shortest average one-way travel time: 7h 52m.

Which 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 46% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 4 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Which airport is the most popular layover for flights between Ottawa and Seattle?

Calgary (YYC) was the most common stop: 68% of momondo users choosing one-stop flights on this route connected there.

Which layover airport offers the lowest fares from Ottawa to Seattle?

Flights via Calgary (YYC) offer the lowest average round-trip price of C$ 538.

Which layover airport has the shortest connection time from Ottawa to Seattle?

Chicago (ORD) has the shortest average layover time for this route: 1h 09m.

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?

There are 4 operators available for flights from Ottawa Airport to Seattle/Tacoma Intl Airport as of October 2026.

How old do you have to be to fly from Ottawa Airport to Seattle/Tacoma Intl Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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.

C$ 303 Cheap Flights from Ottawa to Seattle in 2026/27

Discover deals from 900+ travel sites with momondo.

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.

4:15 p.m. - 1:40 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

24h 25m1 stop Calgary

2:30 p.m. - 2:30 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

21h 00m1 stop Calgary

C$ 592WestJet

Tue, 24 Nov - Mon, 30 Nov

6:10 a.m. - 1:40 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

10h 30m1 stop Calgary

2:30 p.m. - 2:30 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

21h 00m1 stop Calgary

C$ 604WestJet

Thu, 19 Nov - Mon, 23 Nov

4:15 p.m. - 1:40 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

24h 25m1 stop Calgary

2:30 p.m. - 12:44 a.m.SEA Seattle/Tacoma Intl-YOW Ottawa

31h 14m2 stops Calgary Toronto Pearson Intl

C$ 614WestJet

Tue, 24 Nov - Mon, 30 Nov

2:00 p.m. - 8:59 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

9h 59m1 stop Toronto Pearson Intl

7:45 a.m. - 7:45 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

9h 00m1 stop Toronto Pearson Intl

C$ 652Air Canada

Sat, 31 Oct - Tue, 3 Nov

7:45 a.m. - 2:37 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

9h 52m1 stop Vancouver Intl

7:45 a.m. - 7:45 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

9h 00m1 stop Toronto Pearson Intl

C$ 671Air Canada

Fri, 13 Nov - Sun, 22 Nov

6:00 a.m. - 5:57 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

14h 57m2 stops Newark Denver Intl

7:04 p.m. - 3:07 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

17h 03m2 stops Denver Intl Washington, D.C. Dulles Intl

C$ 710United Airlines

Fri, 13 Nov - Sun, 22 Nov

6:00 a.m. - 9:39 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

18h 39m1 stop Newark

11:59 p.m. - 2:29 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

11h 30m2 stops Houston George Bush Intcntl Washington, D.C. Reagan-National

C$ 710United Airlines

Fri, 30 Oct - Sun, 8 Nov

6:10 a.m. - 1:40 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

10h 30m1 stop Calgary

2:30 p.m. - 1:12 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

19h 42m1 stop Calgary

C$ 729Multiple Airlines

Fri, 13 Nov - Fri, 20 Nov

6:10 a.m. - 1:40 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

10h 30m1 stop Calgary

5:48 p.m. - 1:12 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

16h 24m1 stop Calgary

C$ 736Multiple Airlines

Fri, 13 Nov - Fri, 20 Nov

6:10 a.m. - 1:40 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

10h 30m1 stop Calgary

6:00 a.m. - 12:44 a.m.SEA Seattle/Tacoma Intl-YOW Ottawa

15h 44m2 stops Detroit Metropolitan Wayne County Toronto Pearson Intl

C$ 772Delta

Tue, 3 Nov - Tue, 5 Jan

Cheap last-minute flights

Enter your travel dates to find the best prices.

1:20 p.m. - 6:45 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

8h 25m1 stop Calgary

10:30 a.m. - 12:20 a.m.SEA Seattle/Tacoma Intl-YOW Ottawa

10h 50m2 stops Calgary Toronto Pearson Intl

C$ 1,046WestJet

Fri, 9 Oct - Sun, 18 Oct

1:20 p.m. - 6:45 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

8h 25m1 stop Calgary

7:35 p.m. - 5:35 a.m.SEA Seattle/Tacoma Intl-YOW Ottawa

7h 00m1 stop Calgary

C$ 1,063WestJet

Thu, 8 Oct - Sun, 18 Oct

1:20 p.m. - 6:45 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

8h 25m1 stop Calgary

8:02 a.m. - 12:55 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

25h 53m1 stop Calgary

C$ 1,063Multiple Airlines

Fri, 9 Oct - Sun, 18 Oct

1:20 p.m. - 6:45 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

8h 25m1 stop Calgary

10:30 a.m. - 12:20 a.m.SEA Seattle/Tacoma Intl-YOW Ottawa

10h 50m2 stops Calgary Toronto Pearson Intl

C$ 1,073WestJet

Thu, 8 Oct - Sun, 18 Oct

1:20 p.m. - 6:45 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

8h 25m1 stop Calgary

10:30 a.m. - 5:15 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

27h 45m1 stop Calgary

C$ 1,078WestJet

Fri, 9 Oct - Sun, 18 Oct

8:50 p.m. - 6:45 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

24h 55m2 stops Toronto Island Calgary

8:02 a.m. - 12:55 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

25h 53m1 stop Calgary

C$ 1,103Multiple Airlines

Fri, 9 Oct - Sun, 18 Oct

1:20 p.m. - 6:45 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

8h 25m1 stop Calgary

8:02 a.m. - 2:55 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

27h 53m2 stops Calgary Toronto Pearson Intl

C$ 1,155Multiple Airlines

Fri, 9 Oct - Sun, 18 Oct

6:25 p.m. - 6:45 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

27h 20m2 stops Toronto Pearson Intl Calgary

8:02 a.m. - 12:55 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

25h 53m1 stop Calgary

C$ 1,167Multiple Airlines

Thu, 8 Oct - Sun, 18 Oct

2:52 p.m. - 8:37 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

8h 45m1 stop Washington, D.C. Dulles Intl

6:43 p.m. - 9:56 a.m.SEA Seattle/Tacoma Intl-YOW Ottawa

12h 13m2 stops Los Angeles Washington, D.C. Dulles Intl

C$ 1,192United Airlines

Fri, 9 Oct - Mon, 12 Oct

2:52 p.m. - 8:37 p.m.YOW Ottawa-SEA Seattle/Tacoma Intl

8h 45m1 stop Washington, D.C. Dulles Intl

11:13 p.m. - 5:16 p.m.SEA Seattle/Tacoma Intl-YOW Ottawa

15h 03m1 stop Chicago O'Hare Intl

C$ 1,192United Airlines

Fri, 9 Oct - Mon, 12 Oct

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WestJet flights from Ottawa to Seattle

Our best WestJet deals on Ottawa to Seattle flight tickets

WestJet

24 Nov

YOW4:15 p.m.Ottawa

24h 25m

1 stop

SEA1:40 p.m.Seattle/Tacoma Intl

30 Nov

SEA2:30 p.m.Seattle/Tacoma Intl

21h 00m

1 stop

YOW2:30 p.m.Ottawa

C$ 592

WestJet

19 Nov

YOW6:10 a.m.Ottawa

10h 30m

1 stop

SEA1:40 p.m.Seattle/Tacoma Intl

23 Nov

SEA2:30 p.m.Seattle/Tacoma Intl

21h 00m

1 stop

YOW2:30 p.m.Ottawa

C$ 604

WestJet

24 Nov

YOW4:15 p.m.Ottawa

24h 25m

1 stop

SEA1:40 p.m.Seattle/Tacoma Intl

30 Nov

SEA2:30 p.m.Seattle/Tacoma Intl

31h 14m

2 stops

YOW12:44 a.m.Ottawa

C$ 614

Air Canada flights from Ottawa to Seattle

Our best Air Canada deals on Ottawa to Seattle flight tickets

Air Canada

31 Oct

YOW2:00 p.m.Ottawa

9h 59m

1 stop

SEA8:59 p.m.Seattle/Tacoma Intl

3 Nov

SEA7:45 a.m.Seattle/Tacoma Intl

9h 00m

1 stop

YOW7:45 p.m.Ottawa

C$ 652

Air Canada

12 Nov

YOW7:45 a.m.Ottawa

9h 52m

1 stop

SEA2:37 p.m.Seattle/Tacoma Intl

22 Nov

SEA7:45 a.m.Seattle/Tacoma Intl

9h 00m

1 stop

YOW7:45 p.m.Ottawa

C$ 670

Air Canada

12 Nov

YOW7:45 a.m.Ottawa

9h 52m

1 stop

SEA2:37 p.m.Seattle/Tacoma Intl

19 Nov

SEA8:40 a.m.Seattle/Tacoma Intl

11h 31m

2 stops

YOW11:11 p.m.Ottawa

C$ 679

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Tue 24/11

4:15 p.m.-1:40 p.m.

1 stop24h 25m

Seattle/Tacoma Intl

Mon 30/11

2:30 p.m.-2:30 p.m.

1 stop21h 00m

C$ 592

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Thu 19/11

6:10 a.m.-1:40 p.m.

1 stop10h 30m

Seattle/Tacoma Intl

Mon 23/11

2:30 p.m.-2:30 p.m.

1 stop21h 00m

C$ 604

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Tue 24/11

4:15 p.m.-1:40 p.m.

1 stop24h 25m

Seattle/Tacoma Intl

Mon 30/11

2:30 p.m.-12:44 a.m.

2 stops31h 14m

C$ 614

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Sat 31/10

2:00 p.m.-8:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Tue 3/11

7:45 a.m.-7:45 p.m.

1 stop9h 00m

C$ 652

Quickest round-trip

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Fri 13/11

7:45 a.m.-2:37 p.m.

1 stop9h 52m

Seattle/Tacoma Intl

Sun 22/11

7:45 a.m.-7:45 p.m.

1 stop9h 00m

C$ 670

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Fri 13/11

6:00 a.m.-5:57 p.m.

2 stops14h 57m

Seattle/Tacoma Intl

Sun 22/11

7:04 p.m.-3:07 p.m.

2 stops17h 03m

C$ 710

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Fri 30/10

6:00 a.m.-9:39 p.m.

1 stop18h 39m

Seattle/Tacoma Intl

Sun 8/11

11:59 p.m.-2:29 p.m.

2 stops11h 30m

C$ 710

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Fri 13/11

6:10 a.m.-1:40 p.m.

1 stop10h 30m

Seattle/Tacoma Intl

Fri 20/11

2:30 p.m.-1:12 p.m.

1 stop19h 42m

C$ 729

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Fri 13/11

6:10 a.m.-1:40 p.m.

1 stop10h 30m

Seattle/Tacoma Intl

Fri 20/11

5:48 p.m.-1:12 p.m.

1 stop16h 24m

C$ 736

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Tue 3/11

6:10 a.m.-1:40 p.m.

1 stop10h 30m

Seattle/Tacoma Intl

Tue 5/1

6:00 a.m.-12:44 a.m.

2 stops15h 44m

C$ 772

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

Layovers

What is the typical price of a round-trip flight between Ottawa and Seattle?

Prices are currently typical for flights on this route.

Typical prices usually range from C$ 424 to C$ 686.
The lowest price recently found on this route was C$ 530.

What is the cheapest month to fly to Seattle?

If you aren’t able to travel to Seattle during the month of January, then flying in November is also cheap. Prices for this month can be found on momondo for an average of C$ 413.

How far in advance should I book a flight from Ottawa 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 C$ 635 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 C$ 440 on momondo.

Can stopping save me money on Ottawa to Seattle flights?

You could potentially save up to 12% 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 2026, prices for Ottawa to Seattle flights are approximately 12% 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

Best price found	C$ 303
Fastest flight time	8h 25m
Direct flights	None

The best one-way flight to Seattle from Ottawa in the past 72 hours is C$ 303. The best round-trip flight deal from Ottawa to Seattle found on momondo in the last 72 hours is C$ 592.

The fastest flight from Ottawa to Seattle takes 8h 25m

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

Search flight deals

Frequently asked questions about flying from Ottawa to Seattle

How far is Ottawa to Seattle/Tacoma Intl by plane?
The distance between Ottawa and Seattle/Tacoma Intl is about 3521.0 km. 8h 25m is a normal flight duration for this route.
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?
There are 4 operators available for flights from Ottawa Airport to Seattle/Tacoma Intl Airport as of October 2026.
How old do you have to be to fly from Ottawa Airport to Seattle/Tacoma Intl Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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?
Based on momondo bookings for flights between Ottawa and Seattle, the leading airline is WestJet, making up 55% of the total bookings. Other popular airlines include Air Canada with 31%, United Airlines with 9%, and Delta with 5%.

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
Air Canada	PriceFrom C$ 257	Free Cancellation	Rating 7.1 11,712 reviews	Search Air Canada flights
United Airlines	PriceFrom C$ 259	Free Cancellation	Rating 7.4 10,280 reviews	Search United Airlines flights
WestJet	PriceFrom C$ 313	Free Cancellation	Rating 7.2 3,450 reviews	Search WestJet flights
Delta	PriceFrom C$ 404	Free Cancellation	Rating 7.8 8,627 reviews	Search Delta flights

Leavenworth

Lynnwood

SeaTac

Kirkland

Redmond

Tukwila

Tacoma

Marysville

Woodinville

Puyallup

Bainbridge Island

Ellensburg

Edmonds

Chehalis

Fife

Renton

Shoreline

Lakewood

Ocean Shores

Centralia

Why use momondo?

Why should I use momondo to find a flight deal from Ottawa to Seattle?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Seattle from Ottawa.

Can I find flights from Ottawa to Seattle with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Seattle from Ottawa with this policy.

How can momondo help me find flights from Ottawa to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from Ottawa. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Ottawa to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ottawa to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Nearby airports

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Cabin classes

Other United States destinations

Other flights from Ottawa

Complete your trip

Feeling lucky

Airports servicing Washington

Bellingham Airport

Wenatchee Pangborn Field Airport

Spokane Airport

Pasco Tri Cities Airport

Pullman Moscow Regional Airport

Cheap flights from Ottawa to Seattle from C$ 303

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 12/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Ottawa to Seattle

Cheap round-trip flights

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Cheap last-minute flights

Big names, great deals

Big names, great deals

Filter for what you want

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Trusted and free

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WestJet flights from Ottawa to Seattle

Our best WestJet deals on Ottawa to Seattle flight tickets

Air Canada flights from Ottawa to Seattle

Our best Air Canada deals on Ottawa to Seattle flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Ottawa to Seattle that are best for you.

See travel insights to Seattle from

How to get the cheapest flight ticket from Ottawa to Seattle

What is the typical price of a round-trip flight between Ottawa and Seattle?

What is the cheapest month to fly to Seattle?

How far in advance should I book a flight from Ottawa to Seattle?

Can stopping save me money on Ottawa to Seattle flights?

How have Ottawa to Seattle flight prices changed over time?

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

Which airlines fly to Seattle?

Which airport is the most popular layover for flights between Ottawa and Seattle?

Which layover airport offers the lowest fares from Ottawa to Seattle?

Which layover airport has the shortest travel time from Ottawa to Seattle?

Which layover airport has the shortest connection time from Ottawa to Seattle?

When to book flights from Ottawa to Seattle

Cheap Ottawa to Seattle (YOW to SEA) flight deals and tips

Best price found

Fastest flight time

Direct flights

Frequently asked questions about flying 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

Travelling to a place near Seattle?

Why use momondo?

An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Washington

Fly your favourite airline to Seattle

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Seattle

List of cabin classes available on flights landing in Seattle. Availability may vary depending on flight origin and airline.

Popular Cities in the United States

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Ottawa

According to popular flight searches on momondo this year

Complete your trip to Seattle

Explore popular destinations other users love

According to popular flight searches on momondo this year