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Cheap flights from Ottawa to Seattle from C$ 234

YOW — SEA
8 Oct — 15 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ottawa to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Ottawa to Seattle

Thu 1/101:20 p.m. -
1 stop8h 25m
Wed 7/107:35 p.m. -
1 stop7h 00m
Deal found 8/9C$ 354
Fri 18/91:20 p.m. -
1 stop8h 25m
Fri 25/97:35 p.m. -
1 stop7h 00m
Deal found 6/9C$ 404
Mon 21/98:15 p.m. -
1 stop25h 30m
Fri 25/97:35 p.m. -
1 stop7h 00m
Deal found 6/9C$ 441
Wed 30/96:55 a.m. -
2 stops14h 50m
Sun 4/1010:30 a.m. -
2 stops10h 50m
Deal found 3/9C$ 445
Fri 2/101:20 p.m. -
1 stop8h 25m
Sun 4/1010:30 a.m. -
1 stop16h 05m
Deal found 6/9C$ 459
Tue 29/91:20 p.m. -
1 stop8h 25m
Wed 30/97:35 p.m. -
1 stop7h 00m
Deal found 3/9C$ 462

Find flight deals from Ottawa to Seattle

Round-trip from

C$ 404

One-way from

C$ 234

Popular in

May

Cheapest in

January

Average price

C$ 487
WestJet
  • WestJet
  • 18/9-25/9
  • 2 total stops
  • 15h 25m total
  • Ottawa to Seattle
Search Deals
WestJet
  • WestJet
  • 29/9-31/12
  • 1 total stop
  • 8h 25m total
  • Ottawa to Seattle
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 102 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2026
Search Deals

Cheapflights Fare Finder

 
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

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Mon 9/11

6:10 a.m.-1:40 p.m.

1 stop10h 30m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 234

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Sat 21/11

6:10 a.m.-1:40 p.m.

1 stop10h 30m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 271

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Fri 18/9

4:15 p.m.-6:45 p.m.

1 stop29h 30m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 285

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Mon 12/10

6:15 p.m.-6:45 p.m.

2 stops27h 30m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 297

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Sat 5/12

2:00 p.m.-8:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 301

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Wed 30/9

6:00 a.m.-4:05 p.m.

3 stops13h 05m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 312

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Tue 29/9

6:00 a.m.-10:56 p.m.

3 stops19h 56m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 312
Quickest round-trip

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Sat 5/12

4:36 p.m.-10:33 p.m.

1 stop8h 57m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 312

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Fri 20/11

5:30 a.m.-1:40 p.m.

2 stops35h 10m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 318

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Fri 25/9

6:25 a.m.-6:52 p.m.

1 stop15h 27m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 319

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/9

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

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

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?

Booking 37 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$ 394). Flying from Ottawa to Seattle in May is currently the most expensive (average of C$ 843). 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.

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

Airfare is below average for this route at the moment.

Ottawa to Seattle flights typically cost between C$ 420 and C$ 592 in October.
The cheapest round-trip price found within the last 5 days was C$ 354 on WestJet (1 Oct-7 Oct).

Reviews of airlines servicing Seattle

Get a feel of what it's like to fly with Delta,United Airlines, andWestJet 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.
Delta
7.8
Good
8,548 reviews
Check prices

Entertainment

7.8

Crew

8.5

Boarding

8.1

Food

7.2

Overall

7.8

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Delta
7.8
Good
8,548 reviews
Delta
7.8
Good
8,548 reviews
Check prices

Entertainment

7.8

Crew

8.5

Boarding

8.1

Food

7.2

Overall

7.8

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
United Airlines
7.4
Good
10,181 reviews
Delta
7.8
Good
8,548 reviews
Check prices

Entertainment

7.8

Crew

8.5

Boarding

8.1

Food

7.2

Overall

7.8

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
WestJet
7.2
Good
3,447 reviews
Delta
7.8
Good
8,548 reviews
Check prices

Entertainment

7.8

Crew

8.5

Boarding

8.1

Food

7.2

Overall

7.8

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Air Canada
7.1
Good
11,600 reviews
Delta
7.8
Good
8,548 reviews
Check prices

Entertainment

7.8

Crew

8.5

Boarding

8.1

Food

7.2

Overall

7.8

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,

Related info for your journey

  • How long is the flight from Ottawa to Seattle?

    There are many flights that can get you from Ottawa to Seattle in 8h 25m. Fly via 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, Air Canada (C$ 250), United Airlines (C$ 252), and WestJet (C$ 337) offers the cheapest pricing from Ottawa to Seattle. You may be able to fly from Ottawa to Seattle for 59% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Ottawa to Seattle one-way?

    C$ 121 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Air Canada and United Airlines, with prices starting from C$ 151 and C$ 208, respectively.

  • 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$ 394). Flying from Ottawa to Seattle in May is currently the most expensive (average of C$ 843). 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
SeaTac
Kent
Mukilteo
Leavenworth
Tacoma
Renton
Cashmere
Lynnwood
Ellensburg
Tukwila
Olympia
Marysville
Federal Way
Kirkland

Browse thousands of different options on Cheapflights for your next trip

Top 4 airlines flying from Ottawa to Seattle

AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 250AverageC$ 620FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 252AverageC$ 566FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 337AverageC$ 590FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 392AverageC$ 1,110FlexibilityNo cancel feeOn-timeN/A
Search Delta flights

Fly with Cheapflights

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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