Philadelphia to Seattle (PHL → SEA). We are tracking 10 fares on this route.
Cheapest tracked fare $143 · typical price $289 · you save about $146 (51%)
Cheapest fares we're tracking
Airline
Departs
Stops
Price
—
2026-10-21
1 stop
$143
—
2026-10-22
1 stop
$143
—
2026-11-20
1 stop
$146
Frontier Airlines
2026-10-19
1 stop
$166
—
2026-09-23
1 stop
$197
—
2026-11-04
1 stop
$197
—
2026-12-02
1 stop
$197
—
2027-01-06
1 stop
$197
—
2027-02-03
1 stop
$197
—
2026-09-24
1 stop
$197
Could you save more?
The airport you were going to fly from is often not the cheapest one. Compare every airport in a region against each other, or check whether a multi-day stopover beats the direct fare.
How cheap can flights from Philadelphia to Seattle get?
The cheapest fare we have tracked on this route is $143, compared with a typical $289 for a trip of this distance.
Is it cheaper to fly to Seattle from a different airport?
Often, yes. Fares out of secondary airports are frequently cheaper than the obvious hub, but they are the ones most likely to be missing from a normal search. Our reverse search compares every airport in a region against each other so the cheaper departure point is not hidden.
Could a stopover make Philadelphia to Seattle cheaper?
Sometimes. On thin long-haul routes a two-leg trip with a multi-day stopover can beat the direct fare, and occasionally a direct fare is not sold at all. Our detour search prices those routings against the direct flight.