Cheap flights from Pennsylvania to Seattle from $120

In general, November is the cheapest month to fly from Pennsylvania to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $98. If you don’t want to visit Seattle in November, then you should wait until April to fly from Pennsylvania, when ticket prices are also cheap, with an average price of $108.

On average, the least expensive day to fly to Seattle from Pennsylvania is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $430. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Pennsylvania because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $554.

Flying to Seattle from Pennsylvania in the evening is the least expensive time of day to depart. momondo users have found prices as low as $450 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $475. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Seattle from Pennsylvania when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $396 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Pennsylvania for as low as $362 on momondo.

Southwest, Alaska Airlines, and United Airlines are the most popular carriers operating from Pennsylvania to Seattle/Tacoma Intl

American Airlines, Alaska Airlines and Delta are the top three most popular airlines that fly to Seattle from Pennsylvania according to our data. American Airlines is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 7 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

As of May 2026, there are 55 flights per day flying from Pennsylvania to Seattle. The most common time of day flights depart is 6:00PM, with 69% of flights taking off in the evening.

The number of flights available between Pennsylvania and Seattle is 388 per week as of May 2026. The most frequent departure day is Mon, with 20% of weekly flights leaving on this day.