Cheap flights from Portland to Seattle from £100

The cheapest month to fly to Seattle from Portland is in January. Flight prices, which tend to average around £105, are often lower during this time because this is during the off-season. The month of December is another great option to travel to Seattle, with average flight prices from Portland averaging around £112.

According to our data, Wednesday is the cheapest day to fly to Seattle from Portland. The lowest ticket price found for a Wednesday departure recently was £224. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Tuesday as prices are generally higher than usual. According to our data, the average ticket price to Seattle on Tuesday is £886.

According to our data, the cheapest time of day to fly to Seattle is at midday. momondo users have found flights departing from Portland to Seattle at midday for as low as £503. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive, with an average ticket price of £705.

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 £179 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Portland for as low as £126 on momondo.

There is only 1 cabin class 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.

As of October 2026, 32 flights take off from Portland and land in Seattle each day. The most common flight departure time for this route is 15:00, with 38% of daily flights taking off in the afternoon.

229 flights are operational weekly from Portland to Seattle as of October 2026. The most popular departure day for this route is Sat, with 25% of flights per week taking off on this day.