# Who flies Seattle → Philadelphia nonstop?

**2 airlines fly Seattle → Philadelphia nonstop: Alaska Airlines and American Airlines.**

| Airline | Routes | Book direct |
|---|---|---|
| Alaska Airlines | Seattle–Tacoma (SEA) → Philadelphia (PHL) | https://www.alaskaair.com |
| American Airlines | Seattle–Tacoma (SEA) → Philadelphia (PHL) | https://www.aa.com |

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Compare fares for SEA-PHL: [Trip.com](https://www.trip.com/flights/seattle-to-philadelphia/tickets-SEA-PHL/?allianceid=1094387&sid=2209817&trip_sub1=c4c6f3cbcbb845d69061b1005-713359) · [Aviasales](https://www.aviasales.com/search/SEA1011PHL1?marker=713359). Affiliate links (Trip.com, Aviasales): picktheflight may earn a commission. It never changes the price or which airlines are listed.

On picktheflight: https://picktheflight.com/?from=SEA&to=PHL · JSON: https://picktheflight.com/intents/SEA/PHL

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Data built 2026-10-19 from airline schedule tables on Wikipedia ("Airlines and destinations"), matched by exact airport article; airline booking sites from Wikidata. Schedules change. Confirm the flight on the airline's own site before booking.