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Cheap flights from Ottawa to Seattle from C$ 280

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 18/9. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — SEA
22 Aug — 29 Aug1
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
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 23 July 2026.

Sat 10/101:20 p.m.
YOW
-
SEA
1 stop8h 25m
WestJet
Wed 21/107:35 p.m.
SEA
-
YOW
1 stop7h 00m
WestJet
Deal found 23/7C$ 496
Sat 12/91:20 p.m.
YOW
-
SEA
1 stop8h 25m
WestJet
Mon 14/97:35 p.m.
SEA
-
YOW
1 stop7h 00m
WestJet
Deal found 19/7C$ 498
Mon 14/91:20 p.m.
YOW
-
SEA
1 stop8h 25m
WestJet
Mon 28/97:35 p.m.
SEA
-
YOW
1 stop7h 00m
WestJet
Deal found 20/7C$ 503
Mon 17/812:25 p.m.
YOW
-
SEA
2 stops11h 35m
WestJet
Wed 9/97:35 p.m.
SEA
-
YOW
1 stop7h 00m
WestJet
Deal found 23/7C$ 504
Sun 16/81:20 p.m.
YOW
-
SEA
1 stop8h 25m
WestJet
Sun 23/87:35 p.m.
SEA
-
YOW
1 stop7h 00m
WestJet
Deal found 19/7C$ 505
Wed 9/91:20 p.m.
YOW
-
SEA
1 stop8h 25m
WestJet
Sun 13/97:35 p.m.
SEA
-
YOW
1 stop7h 00m
WestJet
Deal found 20/7C$ 508
Wed 30/91:20 p.m.
YOW
-
SEA
1 stop8h 25m
WestJet
Sun 4/107:35 p.m.
SEA
-
YOW
1 stop7h 00m
WestJet
Deal found 19/7C$ 511
Sun 6/96:55 a.m.
YOW
-
SEA
2 stops14h 50m
WestJet
Mon 14/97:35 p.m.
SEA
-
YOW
1 stop7h 00m
WestJet
Deal found 19/7C$ 524

Find 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 23 July 2026.

Round-trip from

C$ 496

One-way from

C$ 280

Popular in

May

Cheapest in

January

Average price

C$ 714
WestJet
  • WestJet
  • 10/10-21/10
  • 2 total stops
  • 15h 25m total
  • Ottawa to Seattle
Search Deals
18/9
  • 18/9
  • 3 total stops
  • 24h 35m total
  • Ottawa to Seattle
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 99 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

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 23 July 2026.
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 - SEA

YOWSEA

Ottawa

Fri 18/9

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

2 stops27h 30m

Seattle/Tacoma Intl

Tue 22/9

7:35 p.m.-5:35 a.m.

1 stop7h 00m

C$ 587

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 18/8

6:15 p.m.-9:40 a.m.

2 stops18h 25m

Seattle/Tacoma Intl

Thu 3/9

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 610

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 23/10

6:25 a.m.-8:37 p.m.

2 stops17h 12m

Seattle/Tacoma Intl

Mon 26/10

6:51 p.m.-1:11 p.m.

2 stops15h 20m

C$ 711

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 18/8

2:35 p.m.-10:42 p.m.

2 stops11h 07m

Seattle/Tacoma Intl

Wed 2/9

8:40 a.m.-10:35 p.m.

2 stops10h 55m

C$ 711
Quickest round-trip

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 18/8

6:25 a.m.-11:32 a.m.

1 stop8h 07m

Seattle/Tacoma Intl

Wed 2/9

11:04 p.m.-9:56 a.m.

1 stop7h 52m

C$ 714

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 18/8

6:25 a.m.-7:07 p.m.

1 stop15h 42m

Seattle/Tacoma Intl

Tue 1/9

5:13 p.m.-1:59 p.m.

1 stop17h 46m

C$ 715
Cheapest one-way

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 31/8

12:25 p.m.-6:45 p.m.

2 stops9h 20m

C$ 294

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 5/12

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

1 stop9h 59m

C$ 342

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 5/12

5:40 a.m.-1:20 p.m.

2 stops34h 40m

C$ 342

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 15/9

1:20 p.m.-6:45 p.m.

1 stop8h 25m

C$ 342

Flights are sorted by cheapest round-trip flights first.

Deals found on 22/7

Showing 1-10 of 15 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
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?

Booking 31 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$ 805). 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$ 595 and C$ 790 in October.
The cheapest round-trip price found within the last 5 days was C$ 496 on WestJet (10 Oct-21 Oct).

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 23 July 2026.
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
8,484 reviews
Check prices

Crew

8.5

Comfort

7.8

Overall

7.8

Boarding

8.1

Food

7.2

Entertainment

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
8,484 reviews
Delta
7.8
Good
8,484 reviews
Check prices

Crew

8.5

Comfort

7.8

Overall

7.8

Boarding

8.1

Food

7.2

Entertainment

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
10,024 reviews
Delta
7.8
Good
8,484 reviews
Check prices

Crew

8.5

Comfort

7.8

Overall

7.8

Boarding

8.1

Food

7.2

Entertainment

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
3,416 reviews
Delta
7.8
Good
8,484 reviews
Check prices

Crew

8.5

Comfort

7.8

Overall

7.8

Boarding

8.1

Food

7.2

Entertainment

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
11,377 reviews
Delta
7.8
Good
8,484 reviews
Check prices

Crew

8.5

Comfort

7.8

Overall

7.8

Boarding

8.1

Food

7.2

Entertainment

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

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 17h 12m. 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, United Airlines (C$ 256), Air Canada (C$ 272), and WestJet (C$ 343) offers the cheapest pricing from Ottawa to Seattle. You may be able to fly from Ottawa to Seattle for 57% 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$ 167, 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$ 805). 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
Leavenworth
Mukilteo
Tacoma
Renton
Cashmere
Lynnwood
Ellensburg
Tukwila
Olympia
Marysville
Federal Way
Kirkland

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 4 airlines flying from Ottawa to Seattle

Discover the top 4 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 23 July 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 256AverageC$ 576FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 272AverageC$ 646FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 343AverageC$ 588FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 399AverageC$ 1,189FlexibilityNo cancel feeOn-timeN/A
Search Delta 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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