Cheap flights from Portland to Seattle from $136

In general, December is the cheapest month to fly from Portland to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $149. If you don’t want to visit Seattle in December, then you should wait until January to fly from Portland, when ticket prices are also cheap, with an average price of $158.

On average, the least expensive day to fly to Seattle from Portland is on a Thursday. momondo users have found tickets for Thursday departures for as low as $663. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Portland because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $934.

Flying to Seattle from Portland in the morning is the least expensive time of day to depart. momondo users have found prices as low as $765 when looking at flights departing in the morning. Flights to Seattle are more costly at noon, with an average ticket price of $967. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Portland to Seattle/Tacoma Intl for the best Portland - Seattle/Tacoma Intl flight prices

You are more likely to see cheaper flights to Seattle from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $237 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Portland for as low as $167 on momondo.

There are 4 cabin classes available to choose from on Portland to Seattle flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Alaska Airlines and Delta are the most popular carriers operating from Portland to Seattle/Tacoma Intl

Alaska Airlines, Delta and Air Excursions are the top three most popular airlines that fly to Seattle from Portland according to our data. Alaska Airlines is the first choice among our users, with 64% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 3 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

29 flights are operational daily from Portland to Seattle as of October 2026. The most popular departure time for this route is 3:00PM, with 37% of flights per day taking off at noon.

The number of flights available between Portland and Seattle is 204 per week as of October 2026. The most frequent departure day is Wed, with 28% of weekly flights leaving on this day.