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$156+ Cheap flights from Ottawa (YOW) to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — SEA
Aug 18 — Aug 251
Mon 8/18
Mon 8/25
1 adult, Economy
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Cheapflights Tip: The best prices from Ottawa to Seattle/Tacoma Intl are usually found in September or October, booked 32 days in advance, depart on a Saturday or Thursday and return on a Thursday

Cheap flight deals from Ottawa to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 13, 2025.

Round-trip from

$271
(Trip.com)

One-way from

$156
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$411
From Ottawa to Seattle/Tacoma Intl
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One-way flight from Ottawa to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 7% potential increase in price ($36 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Ottawa to Seattle

Cheapest flights from Ottawa to Seattle
Explore the most affordable flight options available from Ottawa to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 13, 2025.

This Trip.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/56:00 amYOW - SEA
1 stop9h 59mWestJet
Thu 10/97:05 amSEA - YOW
1 stop8h 15mWestJet
Deal found 8/13$271
This Trip.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:00 amYOW - SEA
1 stop9h 59mWestJet
Sat 9/201:50 pmSEA - YOW
1 stop7h 50mWestJet
Deal found 8/11$290
This Trip.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/103:35 pmYOW - SEA
1 stop7h 54mWestJet
Mon 10/132:05 pmSEA - YOW
1 stop7h 35mWestJet
Deal found 8/11$294
This FlightHub deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:00 amYOW - SEA
1 stop9h 59mWestJet
Sun 10/268:40 amSEA - YOW
2 stops13h 02mWestJet
Deal found 8/13$297
This Trip.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/56:00 amYOW - SEA
1 stop9h 59mWestJet
Mon 9/88:40 amSEA - YOW
2 stops12h 42mWestJet
Deal found 8/11$302
This lastminute.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/275:40 amYOW - SEA
2 stops11h 40mWestJet
Sun 11/23:10 pmSEA - YOW
2 stops24h 11mWestJet
Deal found 8/11$312
This FlightHub deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/35:15 pmYOW - SEA
2 stops28h 59mWestJet
Tue 10/77:05 amSEA - YOW
1 stop8h 15mWestJet
Deal found 8/11$313
This FlightHub deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/266:00 amYOW - SEA
1 stop9h 58mWestJet
Wed 9/31:50 pmSEA - YOW
1 stop7h 50mWestJet
Deal found 8/11$317
This oojo deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:00 amYOW - SEA
1 stop9h 59mWestJet
Mon 10/273:10 pmSEA - YOW
1 stop22h 43mWestJet
Deal found 8/11$320

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated August 13, 2025.
Use the filters below to find and compare flights from Ottawa to Seattle that are best for you.

Fly from

Ottawa

Fly to

Seattle

Route

Depart

Return

Price

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 10/5

6:00 am-12:59 pm

1 stop9h 59m

Seattle/Tacoma Intl

Thu 10/9

7:05 am-6:20 pm

1 stop8h 15m

$271

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 9/15

6:00 am-12:59 pm

1 stop9h 59m

Seattle/Tacoma Intl

Sat 9/20

1:50 pm-12:40 am

1 stop7h 50m

$290

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 10/10

3:35 pm-8:29 pm

1 stop7h 54m

Seattle/Tacoma Intl

Mon 10/13

2:05 pm-12:40 am

1 stop7h 35m

$294

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 10/23

6:00 am-12:59 pm

1 stop9h 59m

Seattle/Tacoma Intl

Sun 10/26

8:40 am-12:42 am

2 stops13h 02m

$297

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 9/5

6:00 am-12:59 pm

1 stop9h 59m

Seattle/Tacoma Intl

Mon 9/8

8:40 am-12:22 am

2 stops12h 42m

$302

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 10/27

5:40 am-2:20 pm

2 stops11h 40m

Seattle/Tacoma Intl

Sun 11/2

3:10 pm-6:21 pm

2 stops24h 11m

$312

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 10/3

5:15 pm-7:14 pm

2 stops28h 59m

Seattle/Tacoma Intl

Tue 10/7

7:05 am-6:20 pm

1 stop8h 15m

$313

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 10/28

6:45 pm-2:20 pm

1 stop22h 35m

Seattle/Tacoma Intl

Mon 11/3

3:10 pm-2:01 pm

2 stops19h 51m

$317

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 8/27

7:50 am-12:58 pm

1 stop8h 08m

Seattle/Tacoma Intl

Wed 9/3

1:50 pm-12:40 am

1 stop7h 50m

$317

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 10/20

7:50 am-12:59 pm

1 stop8h 09m

$156

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

Showing 1-10 of 17 results
1
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Best time to book a flight from Ottawa to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Ottawa with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ottawa to Seattle

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

Use this chart to determine the optimal time to book a round-trip flight from Ottawa to Seattle. Price data was last updated on August 8, 2025.

The best time to book flights from Ottawa to Seattle is 32 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Ottawa to Seattle?

Currently, January is the cheapest month in which you can book a flight from Ottawa to Seattle (average of $238). Flying from Ottawa to Seattle in June is currently the most expensive (average of $389). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from YOW to SEA?

Find hourly flight availability from Ottawa to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 13, 2025.

One of the essential ways to save on airfare from Ottawa to Seattle is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 28% on airfare.

How much does it cost to fly round-trip from Ottawa to Seattle?

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated August 13, 2025.
Peruse reviews from past customers who have flown with United Airlines, WestJet, and Air Canada from Ottawa to Seattle to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,920 reviews

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
United Airlines
7.4
Good
8,920 reviews
United Airlines
7.4
Good
8,920 reviews

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
WestJet
7.2
Good
3,008 reviews
United Airlines
7.4
Good
8,920 reviews

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
Air Canada
7.1
Good
9,943 reviews
United Airlines
7.4
Good
8,920 reviews

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What is the cheapest airline to fly from Ottawa to Seattle round-trip?

    Flying on WestJet is currently your cheapest option to Seattle, with prices starting at $271. WestJet is currently priced 36% below the average price you’ll pay for this route.

  • Can I find deals for flights from Ottawa to Seattle that include hotel bookings?

    Yes. In addition to deals on Ottawa to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Seattle.

  • Can I find deals for business class flights from Ottawa to Seattle?

    Yes. Cheapflights offers flight deals from Ottawa to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ottawa to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Ottawa to Seattle (average of $238). Flying from Ottawa to Seattle in June is currently the most expensive (average of $389). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Ocean Shores
Lakewood
Lynnwood
Lacey
Leavenworth
Renton
Olympia
Puyallup
Kent
Cle Elum
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline
Federal Way
Shelton

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Ottawa to Seattle

Discover the top 3 airlines that operate flights from Ottawa to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$277Average$475FlexibilityNo cancel feeOn-time60%
United AirlinesCheapest$323Average$444FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$328Average$467FlexibilityNo cancel feeOn-time67%

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