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Cheap flights from Ottawa to Seattle from C$ 237

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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — SEA
3 Aug — 10 Aug1
1 adult

Cheapflights Tip: The best prices from Ottawa to Seattle/Tacoma Intl are usually found in August or September, booked 32 days in advance, depart on a Thursday or Friday and return on a Monday

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 29 July 2025.

Round-trip from

C$ 453

One-way from

C$ 237

Popular in

December

Cheapest in

August

Average price

C$ 595
WestJet
  • WestJet
  • 6/9-16/9
  • 2 total stops
  • 18h 14m total
  • Ottawa to Seattle
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WestJet
  • WestJet
  • 10/9
  • 1 total stop
  • 7h 44m total
  • Ottawa to Seattle
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 75 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).
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Average for round-trip flights in July 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 29 July 2025.

Sat 6/96:00 a.m.YOW - SEA
1 stop9h 59mWestJet
Tue 16/97:05 a.m.SEA - YOW
1 stop8h 15mWestJet
Deal found 28/7C$ 453
Wed 20/812:20 p.m.YOW - SEA
2 stops11h 08mMultiple Airlines
Sun 7/91:15 p.m.SEA - YOW
1 stop20h 48mMultiple Airlines
Deal found 29/7C$ 488
Tue 19/82:25 p.m.YOW - SEA
1 stop9h 20mAir Canada
Mon 8/910:00 a.m.SEA - YOW
1 stop7h 53mAir Canada
Deal found 29/7C$ 567

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 629,999 searches. Data last updated 29 July 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 6/9

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Tue 16/9

7:05 a.m.-6:20 p.m.

1 stop8h 15m

C$ 453

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 31/8

6:10 a.m.-12:35 p.m.

1 stop9h 25m

Seattle/Tacoma Intl

Wed 3/9

1:50 p.m.-1:03 p.m.

2 stops20h 13m

C$ 516

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 28/8

11:05 a.m.-6:36 p.m.

2 stops10h 31m

Seattle/Tacoma Intl

Mon 6/10

7:15 p.m.-9:00 a.m.

2 stops10h 45m

C$ 589

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 10/9

3:45 p.m.-8:29 p.m.

1 stop7h 44m

C$ 237

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 11/9

5:55 a.m.-4:54 p.m.

2 stops13h 59m

C$ 313

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/7

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 25 July 2025.

Booking 32 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ottawa to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 C$ 262). Flying from Ottawa to Seattle in December is currently the most expensive (average of C$ 353). 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 29 July 2025.

It’s typically best to fly out from Ottawa to Seattle in the evening. Doing so could potentially save you 15% on the flight price compared to flying at noon, which is usually more expensive.

What’s the top layover airport for flights from Ottawa to Seattle?

Share of one-stop round-trip flights from Ottawa to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.

Calgary (YYC) – chosen by Cheapflights users on 32% of one-stop itineraries from Ottawa to Seattle on Cheapflights.

What’s the cheapest layover airport for flights from Ottawa to Seattle?

Average round-trip fare for 1-stop flights from Ottawa to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Calgary (YYC) is the most affordable 1-stop option, with an average round-trip price of C$ 541.

What’s the fastest layover option from Ottawa to Seattle?

Shortest average travel time for 1-stop one-way flights from Ottawa to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Vancouver (YVR) have the shortest average one-way travel time for 1-stop routes: 2h 25m.

Which airport typically offers the quickest layover for flights from Ottawa to Seattle?

Average layover duration for 1-stop one-way flights from Ottawa to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 14m.

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 29 July 2025.
Get a feel of what it's like to fly with WestJet and Air Canada from Ottawa to Seattle by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
WestJet
7.2
Good
2,973 reviews
Check prices

Boarding

7.4

Overall

7.2

Entertainment

6.1

Comfort

7.0

Crew

7.9

Food

6.2

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight
WestJet
7.2
Good
2,973 reviews
WestJet
7.2
Good
2,973 reviews
Check prices

Boarding

7.4

Overall

7.2

Entertainment

6.1

Comfort

7.0

Crew

7.9

Food

6.2

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight
Air Canada
7.1
Good
9,822 reviews
WestJet
7.2
Good
2,973 reviews
Check prices

Boarding

7.4

Overall

7.2

Entertainment

6.1

Comfort

7.0

Crew

7.9

Food

6.2

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight

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

    According to our current data, WestJet (C$ 453), and Air Canada (C$ 589) offers the cheapest pricing from Ottawa to Seattle. You may be able to fly from Ottawa to Seattle for 23% less than the average price by searching for these airlines.

  • 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 C$ 262). Flying from Ottawa to Seattle in December is currently the most expensive (average of C$ 353). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
SeaTac
Tukwila
Tacoma
Marysville
Bothell
Renton
Olympia
Lynnwood

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ottawa to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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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 629,999 searches. Data last updated 29 July 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 344AverageC$ 541FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 404AverageC$ 598FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 471AverageC$ 586FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ottawa to Seattle?

Cheapflights makes it easy to find Ottawa to Seattle flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Seattle?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Seattle from Ottawa.

Can Cheapflights find flights from Ottawa to Seattle with no change fees?

Yes! Cheapflights helps users easily find flights from Ottawa to Seattle with no change fees.

Can Cheapflights notify me if prices for flights from Ottawa to Seattle become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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