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Cheap flights from Ottawa to Seattle from $209

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 8/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ottawa to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
1:20 pm - 6:45 pm
YOW
-
SEA
8h 25m
1 stop
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$352WestJet
Sat, Oct 10 - Wed, Oct 21
WestJet Logo
1:20 pm - 6:45 pm
YOW
-
SEA
8h 25m
1 stop
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$357WestJet
Mon, Sep 14 - Mon, Sep 28
WestJet Logo
12:25 pm - 9:00 pm
YOW
-
SEA
11h 35m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$358WestJet
Mon, Aug 17 - Wed, Sep 9
WestJet Logo
1:20 pm - 6:45 pm
YOW
-
SEA
8h 25m
1 stop
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$361WestJet
Wed, Sep 9 - Sun, Sep 13
WestJet Logo
1:20 pm - 6:45 pm
YOW
-
SEA
8h 25m
1 stop
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$367WestJet
Thu, Sep 10 - Tue, Sep 15
WestJet Logo
6:55 am - 6:45 pm
YOW
-
SEA
14h 50m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$369WestJet
Wed, Sep 9 - Sun, Sep 13
WestJet Logo
6:55 am - 6:45 pm
YOW
-
SEA
14h 50m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$370WestJet
Mon, Sep 14 - Mon, Sep 28
WestJet Logo
1:20 pm - 6:45 pm
YOW
-
SEA
8h 25m
1 stop
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$371WestJet
Wed, Sep 30 - Sun, Oct 4
WestJet Logo
6:55 am - 6:45 pm
YOW
-
SEA
14h 50m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$374WestJet
Tue, Sep 15 - Tue, Sep 22
WestJet Logo
1:20 pm - 6:45 pm
YOW
-
SEA
8h 25m
1 stop
WestJet Logo
10:30 am - 12:20 am
SEA
-
YOW
10h 50m
2 stops
$375WestJet
Wed, Sep 30 - Sun, Oct 4

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WestJet flights from Ottawa to Seattle

Our best WestJet deals on Ottawa to Seattle flight tickets
WestJet
Oct 10
YOW1:20 pmOttawa
8h 25m
1 stop
SEA6:45 pmSeattle/Tacoma Intl
Oct 21
SEA7:35 pmSeattle/Tacoma Intl
7h 00m
1 stop
YOW5:35 amOttawa
$352
WestJet
Sep 14
YOW1:20 pmOttawa
8h 25m
1 stop
SEA6:45 pmSeattle/Tacoma Intl
Sep 28
SEA7:35 pmSeattle/Tacoma Intl
7h 00m
1 stop
YOW5:35 amOttawa
$357
WestJet
Aug 17
YOW12:25 pmOttawa
11h 35m
2 stops
SEA9:00 pmSeattle/Tacoma Intl
Sep 9
SEA7:35 pmSeattle/Tacoma Intl
7h 00m
1 stop
YOW5:35 amOttawa
$358

Air Canada flights from Ottawa to Seattle

Our best Air Canada deals on Ottawa to Seattle flight tickets
Air Canada
Aug 3
YOW5:00 amOttawa
8h 05m
1 stop
SEA10:05 amSeattle/Tacoma Intl
Aug 7
SEA3:00 pmSeattle/Tacoma Intl
11h 54m
1 stop
YOW5:54 amOttawa
$672
Air Canada
Aug 3
YOW5:00 amOttawa
8h 05m
1 stop
SEA10:05 amSeattle/Tacoma Intl
Aug 7
SEA3:00 pmSeattle/Tacoma Intl
11h 54m
1 stop
YOW5:54 amOttawa
$684
Air Canada
Aug 3
YOW5:00 amOttawa
8h 05m
1 stop
SEA10:05 amSeattle/Tacoma Intl
Aug 7
SEA5:50 amSeattle/Tacoma Intl
12h 25m
2 stops
YOW9:15 pmOttawa
$750

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 July 25, 2026.
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

Cheapest round-trip
Quickest round-trip

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 10/10

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Wed 10/21

7:35 pm-5:35 am

1 stop7h 00m

$352

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 9/14

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Mon 9/28

7:35 pm-5:35 am

1 stop7h 00m

$357

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 8/17

12:25 pm-9:00 pm

2 stops11h 35m

Seattle/Tacoma Intl

Wed 9/9

7:35 pm-5:35 am

1 stop7h 00m

$358

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/9

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Sun 9/13

7:35 pm-5:35 am

1 stop7h 00m

$361

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 9/10

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Tue 9/15

7:35 pm-5:35 am

1 stop7h 00m

$367

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/9

6:55 am-6:45 pm

2 stops14h 50m

Seattle/Tacoma Intl

Sun 9/13

7:35 pm-5:35 am

1 stop7h 00m

$369

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 9/14

6:55 am-6:45 pm

2 stops14h 50m

Seattle/Tacoma Intl

Mon 9/28

7:35 pm-5:35 am

1 stop7h 00m

$370

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/30

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Sun 10/4

7:35 pm-5:35 am

1 stop7h 00m

$371

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 9/15

6:55 am-6:45 pm

2 stops14h 50m

Seattle/Tacoma Intl

Tue 9/22

7:35 pm-5:35 am

1 stop7h 00m

$374

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 9/30

1:20 pm-6:45 pm

1 stop8h 25m

Seattle/Tacoma Intl

Sun 10/4

10:30 am-12:20 am

2 stops10h 50m

$375

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

Prices are currently low for flights on this route.

Typical prices usually range from $423 to $655.
The lowest price recently found on this route was $352.

What is the cheapest month to fly to Seattle?

In general, January 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 $285. If you don’t want to visit Seattle in January, then you should wait until September to fly from Ottawa, when ticket prices are also cheap, with an average price of $337.

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 $435 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.

How have Ottawa to Seattle flight prices changed over time?

As of July 2026, prices for Ottawa to Seattle flights are approximately 49% 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

8h 07m

Direct flights

None
The fastest flight from Ottawa to Seattle takes 8h 07m
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 2187.8 mi. Flights usually cover this in 8h 07m, 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
10,034 reviews
Search United Airlines flights
Air CanadaPriceFrom $304Free CancellationRating
7.1
11,382 reviews
Search Air Canada flights
WestJetPriceFrom $358Free CancellationRating
7.2
3,416 reviews
Search WestJet 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
Redmond
Kent
Lakewood
Tukwila
Puyallup
Fife
Federal Way
Cle Elum
Marysville
Kirkland
Centralia
Shoreline
Lacey

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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