Alaska Airlines Flight DL31 Deals & Information (2025/2026)

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Frequently asked questions

What route does flight number AS31 take?
Flight number AS31 flies direct from Philadelphia, PA Airport (PHL-Philadelphia Intl.) to SEA. During this trip, you’ll be in the air for roughly 6 hours and 2 minutes. It pays to book ahead to get your preferred seat.
What terminal does AS31 fly out of?
Flight number AS31 runs between Philadelphia, PA Airport (PHL-Philadelphia Intl.) and Seattle - Tacoma Intl. Airport (SEA), and travelers with a seat on this flight generally board the plane from Terminal D.
What kind of plane is on flight number AS31?
Prepare to jump on board a Boeing 737-900 if you’re taking off on flight AS31. Almost all flights from Philadelphia Airport to Sea-Tac Airport use this type of plane.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your AS31 flight with Travelocity, please visit our Customer Service Portal.