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Cheap flights from Ottawa to Seattle from C$ 211

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 20/3. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — SEA
27 Nov — 4 Dec1
1 adult
1 adult, Economy, 0 bags

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 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 28 October 2025.

Round-trip from

C$ 336

One-way from

C$ 211

Popular in

December

Cheapest in

September

Average price

C$ 536
WestJet
  • WestJet
  • 19/2-22/2
  • 3 total stops
  • 34h 22m total
  • Ottawa to Seattle
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United Airlines
  • United Airlines
  • 20/3
  • 1 total stop
  • 8h 55m total
  • Ottawa to Seattle
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 80 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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Find flight deals from Ottawa to Seattle

Enter your travel dates to find the best prices.

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 28 October 2025.

Tue 2/125:40 a.m.YOW - SEA
2 stops11h 40mWestJet
Wed 10/123:10 p.m.SEA - YOW
1 stop22h 43mWestJet
Deal found 28/10C$ 421
Tue 25/115:40 a.m.YOW - SEA
2 stops11h 40mWestJet
Tue 2/123:10 p.m.SEA - YOW
2 stops30h 32mWestJet
Deal found 28/10C$ 441
Mon 8/125:45 p.m.YOW - SEA
1 stop23h 35mWestJet
Wed 10/123:10 p.m.SEA - YOW
2 stops30h 32mWestJet
Deal found 28/10C$ 471
Tue 9/125:40 a.m.YOW - SEA
2 stops35h 40mMultiple Airlines
Wed 10/1211:10 p.m.SEA - YOW
1 stop12h 34mMultiple Airlines
Deal found 28/10C$ 508
Tue 18/116:45 p.m.YOW - SEA
1 stop15h 26mMultiple Airlines
Tue 25/1111:10 p.m.SEA - YOW
1 stop12h 34mMultiple Airlines
Deal found 28/10C$ 520
Sat 6/126:45 p.m.YOW - SEA
2 stops18h 37mMultiple Airlines
Mon 8/127:54 p.m.SEA - YOW
1 stop15h 50mMultiple Airlines
Deal found 28/10C$ 530
Tue 16/125:40 a.m.YOW - SEA
2 stops11h 40mWestJet
Wed 24/123:10 p.m.SEA - YOW
1 stop22h 43mWestJet
Deal found 26/10C$ 597

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 28 October 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

Tue 14/4

5:50 p.m.-10:08 p.m.

1 stop7h 18m

Seattle/Tacoma Intl

Wed 15/4

8:00 p.m.-6:43 a.m.

1 stop7h 43m

C$ 340

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 19/2

5:40 a.m.-2:19 p.m.

2 stops11h 39m

Seattle/Tacoma Intl

Sun 22/2

3:10 p.m.-12:39 a.m.

2 stops30h 29m

C$ 343

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 14/4

6:52 a.m.-3:05 p.m.

2 stops11h 13m

Seattle/Tacoma Intl

Wed 15/4

11:50 p.m.-1:45 p.m.

1 stop10h 55m

C$ 347

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 9/12

5:40 a.m.-2:20 p.m.

2 stops11h 40m

Seattle/Tacoma Intl

Wed 10/12

3:10 p.m.-12:42 a.m.

2 stops30h 32m

C$ 441

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 25/11

6:00 a.m.-2:20 p.m.

1 stop11h 20m

Seattle/Tacoma Intl

Tue 2/12

3:10 p.m.-4:53 p.m.

1 stop22h 43m

C$ 452

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 8/12

5:45 p.m.-2:20 p.m.

1 stop23h 35m

Seattle/Tacoma Intl

Wed 10/12

3:10 p.m.-4:53 p.m.

1 stop22h 43m

C$ 452

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 9/12

5:40 a.m.-2:20 p.m.

2 stops35h 40m

Seattle/Tacoma Intl

Wed 10/12

11:10 p.m.-2:44 p.m.

1 stop12h 34m

C$ 508

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 20/3

5:57 p.m.-11:52 p.m.

1 stop8h 55m

C$ 211

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 2/12

6:00 a.m.-2:20 p.m.

1 stop11h 20m

C$ 270

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sun 23/11

5:40 a.m.-2:20 p.m.

2 stops35h 40m

C$ 295

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

Showing 1-10 of 17 results
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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 24 October 2025.

Booking 89 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, November is the cheapest month in which you can book a flight from Ottawa to Seattle (average of C$ 284). Flying from Ottawa to Seattle in December is currently the most expensive (average of C$ 511). 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 28 October 2025.

It’s typically best to fly out from Ottawa to Seattle in the evening. Doing so could potentially save you 14% on the flight price compared to flying at noon, which is usually more expensive.

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 28 October 2025.
Get a feel of what it's like to fly with United Airlines,WestJet, andAir 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.
United Airlines
7.4
Good
9,001 reviews
Check prices

Boarding

7.7

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
9,001 reviews
United Airlines
7.4
Good
9,001 reviews
Check prices

Boarding

7.7

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
WestJet
7.2
Good
3,148 reviews
United Airlines
7.4
Good
9,001 reviews
Check prices

Boarding

7.7

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
Air Canada
7.1
Good
10,371 reviews
United Airlines
7.4
Good
9,001 reviews
Check prices

Boarding

7.7

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

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 7h 18m. Fly via Air Canada, WestJet, or United Airlines to get the fastest option. The distance between Ottawa and Seattle is about 3529 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    According to our current data, WestJet (C$ 368), Air Canada (C$ 412), and United Airlines (C$ 425) offers the cheapest pricing from Ottawa to Seattle. You may be able to fly from Ottawa to Seattle for 37% 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, November is the cheapest month in which you can book a flight from Ottawa to Seattle (average of C$ 284). Flying from Ottawa to Seattle in December is currently the most expensive (average of C$ 511). 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
Mukilteo
Bothell
Cashmere
Renton
Olympia
Marysville
Lynnwood

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 629,999 searches. Data last updated 28 October 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 368AverageC$ 550FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 412AverageC$ 606FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 425AverageC$ 565FlexibilityNo 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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