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International Boulevard, SeaTac mi. Flights from Philadelphia Intl. Airport to Seattle - Tacoma Intl. Airport Cheap Flights from Philadelphia to Seattle Prices were available within the past 7 days and starts at 59 for one-way flights and for.

Which airlines provide the cheapest flights from Philadelphia to Seattle? In the past 3 days, the cheapest one-way tickets were found on Frontier ( 66) and Multiple Airlines ( 86), and the lowest round-trip tickets have been found on Multiple Airlines. Find United Airlines cheap flights from Philadelphia to Seattle. Enjoy a Philadelphia to Seattle modern flight experience in premium cabins with Wi-Fi.

Recent searches for flights from Philadelphia to Seattle. Previous. January From Round trip Economy. February From Round trip Economy.

March From Round trip Economy. Next. cmp-label-skip-histogram. Jan. Check availability. 17 Sun. Check availability. 18 Mon. Check availability. 19 Tue. PHL - SEA. Search flights from Philadelphia Intl. (PHL) to Seattle - Tacoma Intl. (SEA) starting at As COVID disrupts travel, a few airlines are offering WAIVING CHANGE FEE for new bookings.