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Cheap flights from Ottawa to Seattle from $178

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 8/27. 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
12:25 pm - 6:45 pm-
9h 20m
WestJet Logo
7:35 pm - 5:35 am-
7h 00m
$319WestJet
Mon, Sep 14 - Mon, Sep 21
WestJet Logo
12:25 pm - 9:00 pm-
11h 35m
WestJet Logo
7:35 pm - 5:35 am-
7h 00m
$332WestJet
Thu, Sep 3 - Thu, Sep 10
WestJet Logo
12:25 pm - 6:45 pm-
9h 20m
WestJet Logo
7:35 pm - 5:35 am-
7h 00m
$336WestJet
Sat, Sep 26 - Sat, Oct 3
Air Canada Logo
12:00 pm - 9:07 pm-
12h 07m
Air Canada Logo
5:50 am - 4:26 pm-
7h 36m
$407Air Canada
Fri, Sep 4 - Mon, Sep 7
Air Canada Logo
2:45 pm - 10:47 pm-
11h 02m
Air Canada Logo
8:00 am - 7:10 pm-
8h 10m
$408Air Canada
Thu, Sep 17 - Thu, Sep 24
United Airlines Logo
6:00 am - 7:07 pm-
16h 07m
United Airlines Logo
10:58 pm - 4:38 pm-
14h 40m
$411United Airlines
Wed, Aug 26 - Wed, Aug 26
United Airlines Logo
6:00 am - 7:07 pm-
16h 07m
United Airlines Logo
11:04 pm - 9:56 am-
7h 52m
$411United Airlines
Thu, Aug 27 - Thu, Aug 27
Air Canada Logo
5:00 am - 9:52 am-
7h 52m
Air Canada Logo
8:40 am - 11:11 pm-
11h 31m
$411Air Canada
Sat, Oct 24 - Thu, Nov 5
Multiple Airlines Logo
2:50 pm - 10:47 pm-
10h 57m
Multiple Airlines Logo
5:50 am - 5:35 am-
20h 45m
$443Multiple Airlines
Mon, Sep 14 - Mon, Sep 21
Multiple Airlines Logo
2:45 pm - 10:47 pm-
11h 02m
Multiple Airlines Logo
5:50 am - 5:35 am-
20h 45m
$450Multiple Airlines
Thu, Sep 17 - Thu, Sep 24

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Air Canada flights from Ottawa to Seattle

Our best Air Canada deals on Ottawa to Seattle flight tickets
Air Canada
Oct 24
YOW5:00 amOttawa
7h 52m
1 stop
SEA9:52 amSeattle/Tacoma Intl
Nov 2
SEA8:40 amSeattle/Tacoma Intl
11h 31m
2 stops
YOW11:11 pmOttawa
$411
Air Canada
Oct 24
YOW6:05 pmOttawa
7h 37m
1 stop
SEA10:42 pmSeattle/Tacoma Intl
Nov 7
SEA7:45 amSeattle/Tacoma Intl
8h 00m
1 stop
YOW6:45 pmOttawa
$414
Air Canada
Oct 25
YOW7:50 amOttawa
13h 32m
2 stops
SEA6:22 pmSeattle/Tacoma Intl
Nov 4
SEA8:40 amSeattle/Tacoma Intl
11h 31m
2 stops
YOW11:11 pmOttawa
$417

United Airlines flights from Ottawa to Seattle

Our best United Airlines deals on Ottawa to Seattle flight tickets
United Airlines
Oct 29
YOW6:00 amOttawa
14h 54m
2 stops
SEA5:54 pmSeattle/Tacoma Intl
Nov 4
SEA5:05 amSeattle/Tacoma Intl
13h 51m
2 stops
YOW9:56 pmOttawa
$416
United Airlines
Aug 18
YOW6:25 amOttawa
8h 07m
1 stop
SEA11:32 amSeattle/Tacoma Intl
Sep 2
SEA11:04 pmSeattle/Tacoma Intl
7h 52m
1 stop
YOW9:56 amOttawa
$429
United Airlines
Aug 18
YOW5:20 pmOttawa
8h 23m
1 stop
SEA10:43 pmSeattle/Tacoma Intl
Sep 2
SEA11:04 pmSeattle/Tacoma Intl
7h 52m
1 stop
YOW9:56 amOttawa
$432

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 August 5, 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

Mon 9/14

12:25 pm-6:45 pm

2 stops9h 20m

Seattle/Tacoma Intl

Mon 9/21

7:35 pm-5:35 am

1 stop7h 00m

$319

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 9/3

12:25 pm-9:00 pm

2 stops11h 35m

Seattle/Tacoma Intl

Thu 9/10

7:35 pm-5:35 am

1 stop7h 00m

$332

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 9/26

12:25 pm-6:45 pm

2 stops9h 20m

Seattle/Tacoma Intl

Sat 10/3

7:35 pm-5:35 am

1 stop7h 00m

$336

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 9/4

12:00 pm-9:07 pm

1 stop12h 07m

Seattle/Tacoma Intl

Mon 9/7

5:50 am-4:26 pm

1 stop7h 36m

$407

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 9/17

2:45 pm-10:47 pm

2 stops11h 02m

Seattle/Tacoma Intl

Thu 9/24

8:00 am-7:10 pm

1 stop8h 10m

$408

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 8/26

6:00 am-7:07 pm

3 stops16h 07m

Seattle/Tacoma Intl

Wed 8/26

10:58 pm-4:38 pm

1 stop14h 40m

$411

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 8/27

6:00 am-7:07 pm

3 stops16h 07m

Seattle/Tacoma Intl

Thu 8/27

11:04 pm-9:56 am

1 stop7h 52m

$411

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 10/24

5:00 am-9:52 am

1 stop7h 52m

Seattle/Tacoma Intl

Thu 11/5

8:40 am-11:11 pm

2 stops11h 31m

$411

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 9/14

2:50 pm-10:47 pm

2 stops10h 57m

Seattle/Tacoma Intl

Mon 9/21

5:50 am-5:35 am

3 stops20h 45m

$443

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 9/17

2:45 pm-10:47 pm

2 stops11h 02m

Seattle/Tacoma Intl

Thu 9/24

5:50 am-5:35 am

3 stops20h 45m

$450

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 $382 to $480.
The lowest price recently found on this route was $319.

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 February to fly from Ottawa, when ticket prices are also cheap, with an average price of $338.

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.

Can stopping save me money on Ottawa to Seattle flights?

You could potentially save up to 1% 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 August 2026, 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

8h 13m

Direct flights

None
The fastest flight from Ottawa to Seattle takes 8h 13m
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 13m, 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
10,064 reviews
Search United Airlines flights
Air CanadaPriceFrom $290Free CancellationRating
7.1
11,429 reviews
Search Air Canada flights
WestJetPriceFrom $358Free CancellationRating
7.2
3,426 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
Kent
Lynnwood
Redmond
Lakewood
Puyallup
Fife
Federal Way
Tukwila
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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