Cheap flights from Seattle to Pennsylvania from $125

The month of September is, on average, the cheapest month to fly to Pennsylvania from Seattle, with most prices found around $42. If you don’t want to visit Pennsylvania in September, then you should wait until February to fly from Seattle, when ticket prices are also cheap, with an average price of $90.

The cheapest day to depart on your flight to Pennsylvania is on a Tuesday when prices can be found for as low as $438. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $547. These prices are subject to change though, so be sure to set up a Price Alert for flights to Pennsylvania.

Our most recent data shows that the best time of day to fly to Pennsylvania is in the evening. Flights from Seattle to Pennsylvania during this time can be as low as $453. In contrast, the most expensive time of day to depart to Pennsylvania is in the afternoon when prices are around $726.

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

You are more likely to see cheaper flights to Pennsylvania from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Pennsylvania for around $419 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Pennsylvania from Seattle for as low as $361 on momondo.

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

American Airlines, Alaska Airlines and United Airlines are the top three most popular airlines that fly to Pennsylvania from Seattle according to our data. American Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Pennsylvania. Keep in mind that there are 7 different airlines that fly to Pennsylvania on a routine basis, so you have a few additional options to choose from.

As of May 2026, 70 flights take off from Seattle and land in Pennsylvania each day. The most common flight departure time for this route is 12:00PM, with 46% of daily flights taking off in the evening.

As of May 2026, there are 491 flights per week flying from Seattle to Pennsylvania. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.