Cheap flights from Philadelphia to Seattle

Cheapest current fares: $155 in September 2026, 3,817 km direct flight in ~4h 29m.

Last updated · By

Live fares · PHL → SEA

Cheapest month-by-month fares

Lowest available fare per calendar month from Philadelphia (PHL) to Seattle (SEA). Refreshed daily.

Philadelphia (PHL) → Seattle (SEA)

  1. September 2026 $155

Frequently asked questions

  • What is the cheapest month to fly from Philadelphia to Seattle?

    Based on current 6-month forward fare data, September 2026 is the cheapest month to fly from Philadelphia (PHL) to Seattle (SEA), with fares starting from $155.

  • What is the lowest current fare from PHL to SEA?

    The lowest currently-listed fare from Philadelphia (PHL) to Seattle (SEA) is $155 on 2026-09-02.

  • How long is the flight from Philadelphia to Seattle?

    Direct flights from PHL to SEA cover approximately 3,817 km (2,372 miles), with an estimated flight time of 4h 29m. Operating airlines: AA, AS, DL.

Related guides for this route

Sibling pages — full route detail, airport overviews, visa context, per-airline routes.

Full route page: PHL → SEA Cheapest month to fly to Seattle All flights from Philadelphia All flights to Seattle Flights to USA Visa-free with USA passport AA routes AS routes DL routes