$319 Cheap Alaska Airlines flights Philadelphia (PHL) to Seattle (SEA)

View $319 flight on Sat, Aug 8, 2026Opens in a new window

$319 Cheap Alaska Airlines flights Philadelphia (PHL) to Seattle (SEA)

Prices were available within the past 7 days and start at $319 for one-way flights and $329 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, Aug 31 - Sun, Sep 13
PHL
Philadelphia
SEA
Seattle
$329 Roundtrip, found 1 day ago
$329
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Mon, Aug 31 from Philadelphia to Seattle, returning Sun, Sep 13, priced at $329 found 1 day ago
Alaska Airlines
Sat, Aug 15 - Sat, Sep 5
PHL
Philadelphia
SEA
Seattle
$372 Roundtrip, found 1 day ago
$372
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Sat, Aug 15 from Philadelphia to Seattle, returning Sat, Sep 5, priced at $372 found 1 day ago

Find the cheapest month to fly from Philadelphia (PHL) to Seattle (SEA)

March is typically the cheapest month to fly

From $148 - $377 per traveler.

Travel information

Origin airport
Philadelphia Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, JetBlue Airways, Southwest Airlines, Sun Country Airlines, United
Popular airline
Delta
Distance
3794 km
Average flight time
3 hours 11 mins

Explore a world of travel with Expedia