Cheap flights from Philadelphia to Seattle
from 155 US$
Compare hundreds of airlines Philadelphia–Seattle
The cheapest month is usually 2026-09 · 155 US$
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About this route
Compare flights from Philadelphia to Seattle, a about 3,819 km route (around 5h 16m nonstop). We gather live prices from hundreds of airlines and agencies so you can find the cheapest and book on the official site, with no hidden fees. Direct flights are available. Airlines such as Alaska Airlines operate this route.
When to buy and when to fly
Prices by date
Fares found by date — cheapest days in green.
How to get the best price
Airlines on this route
FAQ
What's the cheapest month to fly Philadelphia to Seattle?
It's usually 2026-09, from 155 USD. Use the price calendar to compare other dates.
How long is the flight from Philadelphia to Seattle?
A nonstop flight takes about 5h 16m and covers around 3,819 km. Connecting itineraries take longer.
Are there direct flights from Philadelphia to Seattle?
Yes, this route has nonstop flights. Filter by "nonstop" to see them.
Which airlines fly from Philadelphia to Seattle?
Alaska Airlines operate this route, among others. Compare them all in the results.
When should I book Philadelphia–Seattle flights?
As a rule of thumb, booking 3–8 weeks ahead and avoiding weekends and holidays tends to give the best prices. Use the calendar to spot the cheapest dates.
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Philadelphia → Seattle · Live fares from 100+ sites — free, with no hidden fees.