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$137+ 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 10/22. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — SEA
Nov 9 — Nov 161
Sun 11/9
Sun 11/16
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 90 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 October 10, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$233
(United Airlines)

One-way from

$137
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$383
Provider with most accurate pricing for Ottawa-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Ottawa-Seattle/Tacoma Intl flights.
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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. 10% potential increase in price ($50 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 10, 2025.

This Air Canada deal was found by Cheapflights users on 10/9. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/244:10 pmYOW - SEA
1 stop9h 06mAir Canada
Tue 12/25:50 amSEA - YOW
1 stop6h 55mAir Canada
Deal found 10/9$268
This United Airlines deal was found by Cheapflights users on 10/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:05 amYOW - SEA
1 stop19h 12mUnited Airlines
Wed 10/2911:59 pmSEA - YOW
1 stop7h 27mUnited Airlines
Deal found 10/9$276
This Mytrip deal was found by Cheapflights users on 10/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/238:20 pmYOW - SEA
2 stops16h 01mAir Canada
Wed 10/298:15 amSEA - YOW
1 stop8h 03mAir Canada
Deal found 10/9$279
This United Airlines deal was found by Cheapflights users on 10/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/115:55 pmYOW - SEA
2 stops19h 40mUnited Airlines
Tue 11/187:28 pmSEA - YOW
2 stops11h 58mUnited Airlines
Deal found 10/9$280
This United deal was found by Cheapflights users on 10/8. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/243:10 pmYOW - SEA
1 stop10h 31mMultiple Airlines
Tue 12/28:00 pmSEA - YOW
1 stop7h 43mMultiple Airlines
Deal found 10/8$282
This Mytrip deal was found by Cheapflights users on 10/8. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/225:25 pmYOW - SEA
2 stops19h 06mAir Canada
Sat 11/295:50 amSEA - YOW
1 stop6h 56mAir Canada
Deal found 10/8$285
This oojo deal was found by Cheapflights users on 10/9. 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.
Mon 11/245:40 amYOW - SEA
2 stops11h 40mWestJet
Tue 12/23:10 pmSEA - YOW
2 stops30h 32mWestJet
Deal found 10/9$303

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 October 10, 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

Sat 2/28

5:14 pm-10:29 pm

1 stop8h 15m

Seattle/Tacoma Intl

Fri 3/6

11:50 pm-10:07 am

1 stop7h 17m

$233

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 11/24

4:10 pm-10:16 pm

1 stop9h 06m

Seattle/Tacoma Intl

Tue 12/2

5:50 am-3:45 pm

1 stop6h 55m

$268

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 10/23

6:05 am-10:17 pm

1 stop19h 12m

Seattle/Tacoma Intl

Wed 10/29

11:59 pm-10:26 am

1 stop7h 27m

$276

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 10/23

8:20 pm-9:21 am

2 stops16h 01m

Seattle/Tacoma Intl

Wed 10/29

8:15 am-7:18 pm

1 stop8h 03m

$279

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 11/11

2:15 pm-8:54 pm

1 stop9h 39m

Seattle/Tacoma Intl

Tue 11/18

2:40 pm-10:26 am

2 stops16h 46m

$280

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 11/24

3:10 pm-10:41 pm

1 stop10h 31m

Seattle/Tacoma Intl

Tue 12/2

8:00 pm-6:43 am

1 stop7h 43m

$282

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 2/28

5:35 pm-9:31 am

2 stops18h 56m

Seattle/Tacoma Intl

Fri 3/6

3:40 pm-3:00 pm

2 stops20h 20m

$285

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 11/24

5:40 am-2:20 pm

2 stops11h 40m

Seattle/Tacoma Intl

Tue 12/2

3:10 pm-12:42 am

2 stops30h 32m

$303

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 11/23

9:45 am-11:44 pm

2 stops16h 59m

$167

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 11/22

3:10 pm-11:04 pm

1 stop10h 54m

$167

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

Showing 1-10 of 15 results
1
2

Compare providers for flights from Ottawa to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ottawa to Seattle in October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ottawa-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ottawa-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ottawa-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ottawa-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ottawa-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 October 3, 2025.

The best time to book flights from Ottawa to Seattle is 89 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, April is the cheapest month in which you can book a flight from Ottawa to Seattle (average of $234). Flying from Ottawa to Seattle in February is currently the most expensive (average of $359). 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 October 10, 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 27% on airfare.

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 October 10, 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
8,968 reviews

Entertainment

7.1

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
United Airlines
7.4
Good
8,968 reviews
United Airlines
7.4
Good
8,968 reviews

Entertainment

7.1

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
WestJet
7.2
Good
3,122 reviews
United Airlines
7.4
Good
8,968 reviews

Entertainment

7.1

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Air Canada
7.1
Good
10,261 reviews
United Airlines
7.4
Good
8,968 reviews

Entertainment

7.1

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

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.

  • How long is the flight from Ottawa to Seattle?

    There are many flights that can get you from Ottawa to Seattle in 8h 15m. Fly via United Airlines or Air Canada to get the fastest option. Ottawa and Seattle are separated by a distance of 2193 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Ottawa to Seattle round-trip?

    Flying on WestJet is currently your cheapest option to Seattle, with prices starting at $277. Additional round-trip tickets that might be worth considering are offered by Air Canada and United Airlines, with the lowest prices starting at $304 and $361, respectively. WestJet is currently priced 34% 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, April is the cheapest month in which you can book a flight from Ottawa to Seattle (average of $234). Flying from Ottawa to Seattle in February is currently the most expensive (average of $359). 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
Lakewood
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Renton
Lacey
Olympia
Kent
Federal Way
Cle Elum
Puyallup
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline

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 October 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$277Average$480FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$304Average$490FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$361Average$478FlexibilityNo cancel feeOn-time69%

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