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Cheap Flights from Ottawa (YOW) to Seattle (SEAA)

Compare Ottawa International to Seattle flight deals

Find the cheapest month or even day of the year to fly to Seattle

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Flight deals from Ottawa International to Seattle

Looking for a cheap last-minute deal or the best return flight from Ottawa International Airport to Seattle? If you want to travel next month, return fares start from $445. Find the lowest prices on one-way and return tickets right here.
Seattle.$445 per passenger.Departing Mon, 14 Sep, returning Mon, 21 Sep.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Ottawa International on Mon, 14 Sep, arriving in Seattle / Tacoma International.Inbound indirect flight with WestJet, departs from Seattle / Tacoma International on Mon, 21 Sep, arriving in Ottawa International.Price includes taxes and charges.From $445, select.
Seattle.$557 per passenger.Departing Fri, 16 Oct, returning Sun, 18 Oct.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Ottawa International on Fri, 16 Oct, arriving in Seattle / Tacoma International.Inbound indirect flight with WestJet, departs from Seattle / Tacoma International on Sun, 18 Oct, arriving in Ottawa International.Price includes taxes and charges.From $557, select.
Seattle.$592 per passenger.Departing Tue, 18 Aug, returning Wed, 2 Sep.Return flight with United.Outbound indirect flight with United, departs from Ottawa International on Tue, 18 Aug, arriving in Seattle / Tacoma International.Inbound indirect flight with United, departs from Seattle / Tacoma International on Wed, 2 Sep, arriving in Ottawa International.Price includes taxes and charges.From $592, select.
Seattle.$595 per passenger.Departing Sun, 27 Sep, returning Sun, 4 Oct.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Ottawa International on Sun, 27 Sep, arriving in Seattle / Tacoma International.Inbound indirect flight with WestJet, departs from Seattle / Tacoma International on Sun, 4 Oct, arriving in Ottawa International.Price includes taxes and charges.From $595, select.
Seattle.$631 per passenger.Departing Thu, 26 Nov, returning Tue, 1 Dec.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Ottawa International on Thu, 26 Nov, arriving in Seattle / Tacoma International.Inbound indirect flight with WestJet, departs from Seattle / Tacoma International on Tue, 1 Dec, arriving in Ottawa International.Price includes taxes and charges.From $631, select.
Seattle.$631 per passenger.Departing Thu, 26 Nov, returning Mon, 30 Nov.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Ottawa International on Thu, 26 Nov, arriving in Seattle / Tacoma International.Inbound indirect flight with WestJet, departs from Seattle / Tacoma International on Mon, 30 Nov, arriving in Ottawa International.Price includes taxes and charges.From $631, select.
Seattle.$631 per passenger.Departing Thu, 3 Dec, returning Sun, 6 Dec.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Ottawa International on Thu, 3 Dec, arriving in Seattle / Tacoma International.Inbound indirect flight with WestJet, departs from Seattle / Tacoma International on Sun, 6 Dec, arriving in Ottawa International.Price includes taxes and charges.From $631, select.
Seattle.$682 per passenger.Departing Mon, 17 Aug, returning Mon, 24 Aug.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Ottawa International on Mon, 17 Aug, arriving in Seattle / Tacoma International.Inbound indirect flight with WestJet, departs from Seattle / Tacoma International on Mon, 24 Aug, arriving in Ottawa International.Price includes taxes and charges.From $682, select.
Seattle.$860 per passenger.Departing Tue, 2 Mar, returning Sun, 7 Mar.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Ottawa International on Tue, 2 Mar, arriving in Seattle / Tacoma International.Inbound indirect flight with WestJet, departs from Seattle / Tacoma International on Sun, 7 Mar, arriving in Ottawa International.Price includes taxes and charges.From $860, select.
Seattle.$860 per passenger.Departing Sun, 28 Feb, returning Thu, 4 Mar.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Ottawa International on Sun, 28 Feb, arriving in Seattle / Tacoma International.Inbound indirect flight with WestJet, departs from Seattle / Tacoma International on Thu, 4 Mar, arriving in Ottawa International.Price includes taxes and charges.From $860, select.
Seattle.$954 per passenger.Departing Sun, 2 May, returning Mon, 10 May.Return flight with Air Canada.Outbound indirect flight with Air Canada, departs from Ottawa International on Sun, 2 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Air Canada, departs from Seattle / Tacoma International on Mon, 10 May, arriving in Ottawa International.Price includes taxes and charges.From $954, select.
Seattle.$1,021 per passenger.Departing Sun, 20 Dec, returning Sun, 3 Jan.Return flight with United.Outbound indirect flight with United, departs from Ottawa International on Sun, 20 Dec, arriving in Seattle / Tacoma International.Inbound indirect flight with United, departs from Seattle / Tacoma International on Sun, 3 Jan, arriving in Ottawa International.Price includes taxes and charges.From $1,021, select.
Seattle.$1,906 per passenger.Departing Thu, 24 Jun, returning Mon, 5 Jul.Return flight with Air Canada.Outbound indirect flight with Air Canada, departs from Ottawa International on Thu, 24 Jun, arriving in Seattle / Tacoma International.Inbound indirect flight with Air Canada, departs from Seattle / Tacoma International on Mon, 5 Jul, arriving in Ottawa International.Price includes taxes and charges.From $1,906, select.

Find the cheapest month to fly from Ottawa International to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ottawa International to Seattle flights are currently cheapest in September.
Aug
from $682
Sep
from $445
Oct
from $557
Nov
from $631
Dec
from $631
Jan
Find prices
Feb
Find prices
Mar
from $860
Apr
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May
from $954
Jun
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Jul
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Alternative Ottawa International to Seattle routes

Looking for the cheapest, fastest or easiest route from Ottawa International to Seattle? You could fly into the following airports instead.

Seattle Lake Union SPB

2km from central Seattle
Closest
from $1,852
Search flights

Seattle Boeing Fld

11km from central Seattle
from $1,308
Search flights

Seattle / Tacoma International

20km from central Seattle
Cheapest
from $445
Search flights

Paine Field

33km from central Seattle
Search flights

Ottawa to Seattle: Flight information

The things to know before you go.
Cheapest flight found$445
Cheapest month to flySeptember

Finding cheap flights from Ottawa International to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from Ottawa International to Seattle is $445. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Ottawa International to Seattle. But we found flights with one or more stops from $445.
As of August 2026, there are no flights flying from Ottawa International to Seattle.
The cheapest month to fly from Ottawa International to Seattle is usually September.
If you're flying from Ottawa International Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from $445.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ottawa International Airport to Seattle on Monday, 14 September 2026.
No airlines currently offer direct flights between Ottawa International Airport and Seattle. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.

In August, the average temperature is usually around 18°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
Currently, WestJet offers the cheapest flight tickets to Seattle.

Flying from Ottawa/Macdonald-Cartier International Airport (YOW) to Seattle: what you need to know

  • Seattle is three hours behind Ottawa, where Ottawa/Macdonald-Cartier International Airport is located. Seattle runs on the UTC-7 timezone.

  • To avoid missing your YOW to Seattle flight, leave plenty of time to navigate the airport and find your gate. Arriving two hours ahead of international departures and an hour before domestic flights is the standard rule.

  • Be prepared for bigger queues in popular months such as August. Arriving up to four hours ahead of international flights and two hours for a domestic departure is a good idea.

  • The journey from central Ottawa to YOW takes about 45 minutes on public transport. If you ride-share, drive or get a cab, you'll cover the 11 kilometres in 20 minutes or so, depending on traffic conditions.

  • Want a relaxed start to your travels? Stay near YOW. Whether you have an early flight from Ottawa/Macdonald-Cartier International Airport to Seattle or just don't want to be rushed, these hotels put convenience first:

  • Of the flights that depart from Ottawa/Macdonald-Cartier International Airport, 58.21% land on schedule at their destination.

  • The address for YOW is 50 Airport Road.

How to find the cheapest flights from Ottawa/Macdonald-Cartier International Airport (YOW) to Seattle

  • $263 is the lowest price we've seen for a one-way Ottawa/Macdonald-Cartier International Airport to Seattle flight. A round-trip plane ticket right now is $445. Depending on the availability and when you book, these fares can change.

  • Booking early is often the key to securing a cheap flight from YOW to Seattle. Prices tend to rise as demand increases, so the nearer your departure date, the more you'll likely pay.

  • If you're flexible with your travel plans, try using the 'Whole month' tool. It'll find the cheapest price across every month when searching for your Ottawa/Macdonald-Cartier International Airport to Seattle ticket.

  • Stay on top of deals for cheap flights from YOW to Seattle by setting up a Price Alert. You'll get an email or notification through the app when a special offer becomes available.

  • Pick your preferred departure and arrival times, number of stops and airlines with our filters. Then, sort the results for your flight from Ottawa/Macdonald-Cartier International Airport to Seattle by 'Fastest,' 'Best' or 'Cheapest.'

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) is around 23 kilometres from the centre of Seattle. If you're opting for a ride-share or a cab, the drive will take roughly 20 minutes.

  • Travelling to the centre on public transport will take you around 55 minutes.

  • If you have a late flight from Ottawa/Macdonald-Cartier International Airport to Seattle, few things beat the convenience of staying near the terminal. Collect your bags from the carousel and then be showered and snoozing not long after at one of these accommodation options near SEA:

  • Fast-track your adventure by picking up a Seattle-Tacoma International Airport rental car. Grab a set of wheels from Thrifty, Europcar or Budget and explore beyond Seattle's main sights.

  • Reserving your ride from Seattle-Tacoma International Airport around one week before your flight from YOW to Seattle can help you lock in the lowest rate.

Lake Union Sea Plane Base Airport (LKE)

  • Once your flight from Ottawa/Macdonald-Cartier International Airport to Seattle has landed, you can get to the city centre in around 10 minutes by car. Central Seattle is roughly 3 kilometres from Lake Union Sea Plane Base Airport (LKE).

  • If you're catching public transport, it'll take about 25 minutes.

  • Place the 'Do not disturb' sign on your door and unwind at a hotel close to LKE. Here are a few options where you can put your feet up after your YOW to Seattle flight:

Best time to go to Seattle

  • Before securing your flights from Ottawa/Macdonald-Cartier International Airport to Seattle, consider which time of year works best for you. Peak season in Seattle offers a lively atmosphere and plenty of things to do, while the low season brings cheaper deals on hotels and smaller crowds.

  • The warmest month in Seattle is August, with temperatures ranging between 12ºC (54ºF) and 28ºC (82ºF). Lock in your Ottawa/Macdonald-Cartier International Airport to Seattle flight ticket then if you enjoy this type of weather.

  • If you want to travel in cooler conditions, search for a cheap ticket from YOW to Seattle in February when temperatures average between -1ºC (30ºF) and 11ºC (52ºF).

More about Seattle

  • When it comes to looking for somewhere to lay your head, you'll find the top stays in Seattle right here. Explore these options once you've locked in your flight from Ottawa/Macdonald-Cartier International Airport to Seattle:

  • LMN Architects and Greyhound: Bus Station are a couple of big attractions to add to your Seattle must-do list. Keep the sightseeing going at Boeing Radiation Effects Lab.

Explore more of United States

  • Seattle is always a good idea, but there are so many other parts of United States just waiting to be explored. About 241 kilometres south of Seattle, a trip to Portland will keep your itinerary busy. Don't miss top attractions like Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • Spokane is another standout destination in United States and is around 370 kilometres east of Seattle. No journey is complete without dropping by Manito Park, Northwest Museum of Arts & Culture and Spokane Falls.

Plan smart, explore more

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Plan the rest of your trip from Ottawa to Seattle

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.