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Cheap flights from Ottawa to Seattle from C$ 342

YOW — SEA
20 Nov — 27 Nov1
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 3/126:10 a.m. -
1 stop10h 30m
Mon 7/122:30 p.m. -
1 stop21h 00m
Deal found 16/10C$ 578
Mon 14/126:10 a.m. -
1 stop10h 30m
Fri 12/211:00 a.m. -
2 stops9h 40m
Deal found 16/10C$ 579
Thu 19/116:10 a.m. -
1 stop10h 30m
Mon 23/112:30 p.m. -
1 stop21h 00m
Deal found 19/10C$ 582
Wed 2/126:10 a.m. -
1 stop10h 30m
Sun 6/122:30 p.m. -
1 stop21h 00m
Deal found 16/10C$ 620
Fri 13/116:10 a.m. -
1 stop10h 30m
Fri 20/112:30 p.m. -
2 stops30h 10m
Deal found 19/10C$ 637
Tue 1/126:10 a.m. -
1 stop10h 30m
Thu 10/122:30 p.m. -
1 stop21h 00m
Deal found 16/10C$ 639
Fri 20/115:30 a.m. -
2 stops35h 10m
Mon 30/112:30 p.m. -
1 stop21h 00m
Deal found 19/10C$ 644
Thu 12/116:10 a.m. -
1 stop10h 30m
Sun 22/112:30 p.m. -
2 stops30h 10m
Deal found 19/10C$ 645
Thu 3/124:15 p.m. -
1 stop24h 25m
Thu 10/122:30 p.m. -
1 stop21h 00m
Deal found 19/10C$ 649

Find flight deals from Ottawa to Seattle

Round-trip from

C$ 554

One-way from

C$ 342

Popular in

May

Cheapest in

January

Average price

C$ 648
WestJet
  • WestJet
  • 11/2-16/2
  • 2 total stops
  • 31h 30m total
  • Ottawa to Seattle
Search Deals
WestJet
  • WestJet
  • 3/11-31/12
  • 1 total stop
  • 10h 30m total
  • Ottawa to Seattle
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 76 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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
Quickest round-trip

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Tue 3/11

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$ 342

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Thu 3/12

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$ 342

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Tue 29/12

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$ 372

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Sat 5/12

9:45 a.m.-6:24 p.m.

2 stops11h 39m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 392

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Tue 3/11

6:15 a.m.-7:17 p.m.

2 stops16h 02m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 392

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Sun 6/12

5:30 a.m.-6:43 p.m.

2 stops16h 13m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 403

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Thu 3/12

10:30 a.m.-11:44 p.m.

3 stops16h 14m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 426

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Fri 4/12

6:15 a.m.-4:22 p.m.

2 stops13h 07m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 434

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Sat 31/10

6:00 a.m.-10:51 p.m.

2 stops19h 51m

Seattle/Tacoma Intl

Tue 10/11

3:49 p.m.-3:07 p.m.

2 stops20h 18m

C$ 700

OttawaSeattle

YOW Ottawa - SEA Seattle/Tacoma Intl

YOWSEA

Ottawa

Thu 12/11

6:15 a.m.-6:33 p.m.

2 stops15h 18m

Seattle/Tacoma Intl

Sun 22/11

7:04 p.m.-9:56 p.m.

2 stops23h 52m

C$ 703

Flights are sorted by cheapest round-trip flights first.

Deals found on 18/10

Showing 1-10 of 18 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 9 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$ 401). Flying from Ottawa to Seattle in May is currently the most expensive (average of C$ 857). 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 typical for this route at the moment.

Ottawa to Seattle flights typically cost between C$ 438 and C$ 996 in February.
The cheapest round-trip price found within the last 5 days was C$ 554 on WestJet (11 Feb-16 Feb).

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
8,654 reviews
Check prices

Comfort

7.8

Crew

8.5

Entertainment

7.8

Food

7.2

Overall

7.8

Boarding

8.1

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
8,654 reviews
Delta
7.8
Good
8,654 reviews
Check prices

Comfort

7.8

Crew

8.5

Entertainment

7.8

Food

7.2

Overall

7.8

Boarding

8.1

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
7.3
Good
10,392 reviews
Delta
7.8
Good
8,654 reviews
Check prices

Comfort

7.8

Crew

8.5

Entertainment

7.8

Food

7.2

Overall

7.8

Boarding

8.1

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
8,654 reviews
Check prices

Comfort

7.8

Crew

8.5

Entertainment

7.8

Food

7.2

Overall

7.8

Boarding

8.1

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
11,790 reviews
Delta
7.8
Good
8,654 reviews
Check prices

Comfort

7.8

Crew

8.5

Entertainment

7.8

Food

7.2

Overall

7.8

Boarding

8.1

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 19h 51m. Fly via United Airlines to get the fastest option. The distance between Ottawa and Seattle is about 3529 km.

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

    According to our current data, Air Canada (C$ 254), United Airlines (C$ 256), and WestJet (C$ 309) offers the cheapest pricing from Ottawa to Seattle. You may be able to fly from Ottawa to Seattle for 60% less than the average price by searching for these airlines.

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

    C$ 123 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$ 154 and C$ 212, 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$ 401). Flying from Ottawa to Seattle in May is currently the most expensive (average of C$ 857). 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
Ellensburg
Renton
Lynnwood
Cashmere
Leavenworth
Tukwila
Tacoma
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$ 254AverageC$ 677FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 256AverageC$ 798FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 309AverageC$ 601FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 399AverageC$ 1,129FlexibilityNo 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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