Cheap Alaska Airlines flights Philadelphia (PHL) to Seattle (SEA)

Set the “Price (lowest to highest)” filter on Expedia to look for cheap Alaska Airlines round-trip flights from PHL to SEA. Affordable one-way fares are available too.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Search for return or one-way flights to Seattle in January or February. You could find a cheap fare with Alaska Airlines during these off-peak travel months.

Begin your search one to three months ahead of your travel date to score cheap fares on Alaska Airlines flights from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing right, and you can enjoy significant savings on domestic trips.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Alaska Airlines operates direct flights from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA), with 6 departures each week. Simply apply the “Nonstop” and “Airline” filters while searching on Expedia to show all direct Alaska Airlines flights to SEA.

Take off from Philadelphia Intl. Airport (PHL) for Seattle - Tacoma Intl. Airport (SEA) on a nonstop Alaska Airlines flight, and you’ll be in the sky for approximately 6h 23m.

Leaving PHL at 6:32PM UTC-5, the earliest Alaska Airlines flight to SEA arrives at 9:55PM UTC-8. Flying early means you’ll be less likely to experience delays.* Not a morning person? The last Alaska Airlines flight from PHL to SEA departs at 6:32PM UTC-5 and touches down at 9:55PM UTC-8.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Alaska Airlines flights from Philadelphia Intl. Airport (PHL) to Seattle come in to land at Seattle - Tacoma Intl. Airport (SEA). This is the main gateway to this destination.

With top-tier customer service and an excellent in-flight experience, Alaska Airlines is a top choice for many travelers flying from PHL to SEA. Also, if you’re a Mileage Plan and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which you can put toward future getaways.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

You’ll likely board a Boeing 737 MAX 9 or a Boeing 737-900 when flying Alaska Airlines from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA). However, keep in mind that a different plane could be assigned to your route depending on operational reasons.

Typically, you can reschedule or cancel your flight, although there may be additional charges if you booked over 24 hours ago. Need to keep your options open? Use our “No cancel fee” and “Changes included” filters to find flights that won’t charge you extra if you have to adjust your plans. To modify your itinerary, visit “Trips,” select your flight and click on “Manage Booking” for further information.