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

Make use of the “Price (lowest to highest)” filter on Expedia to look for cheap Alaska Airlines round-trip flights from SEA to PHL. Affordable one-way fares are also on offer.**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.

January is one of the most affordable months to jet away to Philadelphia with Alaska Airlines. You could also find excellent prices on one-way and round-trip fares in February.

Search for affordable Alaska Airlines flights from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL) one to three months prior to your departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and journey, the best day to book a domestic flight is generally Sunday and the most expensive day is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**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.

Take off on one of Alaska Airlines’s 6 direct weekly flights from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL). To see what’s available, enter your destination, origin and dates and hit search. Then apply the “Nonstop” and “Airline” filters.

From takeoff till landing, a direct Alaska Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL) takes around 5h 17m.

The first flight from SEA to PHL with Alaska Airlines leaves at 9:15AM UTC-8. You’ll touch down at 5:32PM UTC-5. The last Alaska Airlines flight of the day takes off at 9:15AM UTC-8 and arrives at 5:32PM UTC-5. With 20% fewer cancellations for departures before midday, heading out early is often the best option.**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.

Catch an Alaska Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia, and you’ll probably touch down at Philadelphia Intl. Airport (PHL). This is the airline’s main hub here.

Taking off from SEA to PHL with Alaska Airlines means enjoying a variety of perks, including an excellent in-flight experience and a rewarding loyalty program. Plus, when you book through Expedia, One Key™ members can collect OneKeyCash™* to use on select future travel purchases. That’s in addition to the Mileage Plan points you can earn with Alaska Airlines.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Alaska Airlines generally flies Boeing 737 MAX 9 planes for flights from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL). This airline also operates the Boeing 737-900 on this route. Keep in mind that aircraft type can vary due to operational needs, so the plane you board might be different when you leave.

Depending on the ticket type you purchased, a fee is typically charged if you cancel or reschedule your flight more than 24 hours after it has been confirmed. To find plane tickets with more flexibility, select our “No cancel fee” or “Changes included” filter when looking for flights. For more details on changing or canceling your reservation, visit “Trips,” select your flight and click on “Manage Booking.”