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Cheap flights from Portland to Seattle / Tacoma International

Compare Portland to Seattle / Tacoma International flight deals

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

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Flight deals from Portland to Seattle / Tacoma International

Looking for a cheap last-minute deal or the best round-trip flight from Portland to Seattle / Tacoma International? Find the lowest prices on one-way and round-trip tickets right here.
Seattle.C$150 per passenger.Departing Wed, Aug 13, returning Wed, Aug 20.Round-trip flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departing from Portland on Wed, Aug 13, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departing from Seattle / Tacoma International on Wed, Aug 20, arriving in Portland.Price includes taxes and charges.From C$150, select.
Seattle.C$150 per passenger.Departing Sat, Sep 20, returning Tue, Sep 23.Round-trip flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departing from Portland on Sat, Sep 20, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departing from Seattle / Tacoma International on Tue, Sep 23, arriving in Portland.Price includes taxes and charges.From C$150, select.
Seattle.C$159 per passenger.Departing Sat, Oct 4, returning Sat, Oct 11.Round-trip flight with Delta.Outbound direct flight with Delta departing from Portland on Sat, Oct 4, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departing from Seattle / Tacoma International on Sat, Oct 11, arriving in Portland.Price includes taxes and charges.From C$159, select.
Seattle.C$213 per passenger.Departing Tue, Aug 26, returning Tue, Oct 28.Round-trip flight with Delta.Outbound direct flight with Delta departing from Portland on Tue, Aug 26, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departing from Seattle / Tacoma International on Tue, Oct 28, arriving in Portland.Price includes taxes and charges.From C$213, select.
Seattle.C$255 per passenger.Departing Thu, Nov 13, returning Thu, Nov 20.Round-trip flight with Delta.Outbound direct flight with Delta departing from Portland on Thu, Nov 13, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departing from Seattle / Tacoma International on Thu, Nov 20, arriving in Portland.Price includes taxes and charges.From C$255, select.
Seattle.C$260 per passenger.Departing Sun, Aug 24, returning Sat, Dec 13.Round-trip flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departing from Portland on Sun, Aug 24, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departing from Seattle / Tacoma International on Sat, Dec 13, arriving in Portland.Price includes taxes and charges.From C$260, select.
Seattle.C$295 per passenger.Departing Tue, Jul 29, returning Tue, Aug 5.Round-trip flight with Delta.Outbound direct flight with Delta departing from Portland on Tue, Jul 29, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departing from Seattle / Tacoma International on Tue, Aug 5, arriving in Portland.Price includes taxes and charges.From C$295, select.
Seattle.C$295 per passenger.Departing Fri, Jul 25, returning Sat, Jul 26.Round-trip flight with Delta.Outbound direct flight with Delta departing from Portland on Fri, Jul 25, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departing from Seattle / Tacoma International on Sat, Jul 26, arriving in Portland.Price includes taxes and charges.From C$295, select.

Find the cheapest month to fly from Portland to Seattle / Tacoma International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Portland to Seattle / Tacoma International flights are currently cheapest in August.
Jul
from C$295
Aug
from C$150
Sep
from C$150
Oct
from C$159
Nov
from C$255
Dec
from C$342
Jan
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Feb
from C$295
Mar
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Apr
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May
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Jun
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Direct flights from Portland to Seattle / Tacoma International

Portland to Seattle / Tacoma International: Alternative routes

Compare routes from Portland to Seattle below. You may find an airport to fly into that's cheaper, faster, or easier than Seattle / Tacoma International.

Portland to Seattle: Flight information

The things to know before you go.
Cheapest flight foundC$150
Cheapest month to flyAugust
Average flight time1 hr, 4 mins
Most popular airlineAlaska Airlines
Average flights per week733

Finding cheap flights from Portland to Seattle / Tacoma International: Frequently asked questions

The best price we found for a round-trip flight from Portland to Seattle / Tacoma International is C$150. 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.
1 hour and 4 minutes is the average flight time from Portland to Seattle / Tacoma International.
Alaska Airlines, Air Tahiti Nui and Hawaiian Airlines fly direct from Portland to Seattle / Tacoma International.
There are 733 flights per week flying from Portland to Seattle / Tacoma International, as of July 2025.
The cheapest month to fly from Portland to Seattle / Tacoma International is usually August.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Portland Airport to Seattle / Tacoma International Airport on Wednesday, August 13, 2025.
Yes – the average flight time is 1 hour and 4 minutes.
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 / Tacoma International 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.
Currently, Alaska Airlines offers the cheapest flight tickets to Seattle / Tacoma International.

Flying from Portland International Airport (PDX) to Seattle-Tacoma International Airport (SEA): what you need to know

  • The average length of a direct flight from Portland International Airport to Seattle-Tacoma International Airport is 1 hour 5 minutes.

  • Portland and Seattle share the same timezone, UTC-7.

  • Choose from 163 weekly Portland International Airport to Seattle-Tacoma International Airport flights. The 05:00 departure with Alaska Airlines is the earliest flight available. Alaska Airlines operates the last service of the day at 21:34.

  • Your PDX to SEA flight won't wait if you're late, so get to the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.

  • Flying during a peak month such as July? Major public holidays and other high seasons can result in longer queues and delays at airport checkpoints. Play things extra safe and arrive up to four hours ahead of international flights and two hours before domestic departures.

  • Jetting into Seattle (and then exploring more of United States!) is a breeze with Alaska Airlines. This popular carrier offers direct flights from Portland International Airport to Seattle-Tacoma International Airport.

  • The majority of travellers choose to travel with Alaska Airlines on this route.

  • With an impressive 89.34% of services arriving as planned, Delta Air Lines has the best on-time record for PDX to SEA flights.

  • We make it simple to book a flight with a stopover. To see your options for tickets from Portland International Airport to Seattle-Tacoma International Airport, uncheck 'Direct flights only.' Then, pick a flight that has a stop long enough to explore your chosen city. Stopovers between PDX and SEA include:

    • Vancouver International Airport

    • Sacramento International Airport

    • Metropolitan Oakland International Airport

How to find the cheapest flights from Portland International Airport (PDX) to Seattle-Tacoma International Airport (SEA)

  • The lowest price we've found for a one-way Portland International Airport to Seattle-Tacoma International Airport flight is C$99. A return fare is currently C$150. Depending on the availability when you book, these fares can change.

  • Book six months before you travel. After crunching the numbers on our calendar, this is how far you'll want to book ahead to find cheap tickets from PDX to SEA.

  • Schedule your trip for May. That's the cheapest month for flights from Portland International Airport to Seattle-Tacoma International Airport. If you have flexibility with your dates, use the 'Whole month' tool to see the lowest price across every month.

  • Cut down on the time spent looking for cheap flights from PDX to SEA by creating a Price Alert. You'll get an email or notification through the app when a new discounted fare appears.

  • Choose your preferred departure and arrival times, airlines and number of stops with the filters. Or sort your results by 'Cheapest' to get the best deals on flights from Portland International Airport to Seattle-Tacoma International Airport.

Handy information about Portland International Airport (PDX)

  • PDX's address is 7000 NE Airport Way.

  • Portland International Airport scores high marks for its on-time performance. 83.65% of flights that take off from PDX reach their destination on time.

  • To get to Portland International Airport from central Portland, it'll take about 20 minutes by car. This depends on traffic though. It's approximately 19 kilometres from the airport to the city centre.

  • The journey when using public transport will take about 45 minutes.

  • Get your travels off to a hassle-free start by staying near PDX. Whether you have an early flight from Portland International Airport to Seattle-Tacoma International Airport or want to avoid feeling rushed, these hotels are ideal:

Arriving at Seattle-Tacoma International Airport (SEA)

Getting from Seattle-Tacoma International Airport (SEA) to central Seattle

  • Seattle-Tacoma International Airport is roughly 23 kilometres from the centre of Seattle. The drive time takes about 20 minutes.

  • When travelling by public transport, expect a journey time of about 55 minutes.

When to fly to Seattle-Tacoma International Airport (SEA)

  • July is the busiest month for flights from Portland International Airport to Seattle-Tacoma International Airport. To steer clear of the crowds, head to Seattle in May.

  • Lock in your flight from Portland International Airport to Seattle-Tacoma International Airport for August if you'd like to visit Seattle during its warmest month. Expect temperatures of between 12ºC (54ºF) and 28ºC (82ºF).

  • If you'd rather travel in cooler conditions, look for a cheap ticket from PDX to SEA in February. Temperatures average between -1ºC (30ºF) and 11ºC (52ºF) then.

Explore more of United States

  • Portland is just one of the many cities in United States waiting to be discovered after you've seen Seattle. Around 241 kilometres away to the south, its top attractions include Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • If you're eager to discover another great destination in United States, head for Spokane, roughly 370 kilometres east of Seattle. Manito Park, Northwest Museum of Arts & Culture and Spokane Falls are highlights.

Plan the rest of your trip from Portland to Seattle

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.