Philadelphia to Seattle (PHL → SEA). We are tracking 12 fares on this route.
Cheapest tracked fare $107 · typical price $211 · you save about $104 (49%)
Cheapest fares we're tracking
Airline
Departs
Stops
Price
Frontier Airlines
2026-10-27
2 stops
$107
—
2026-11-23
1 stop
$135
—
2026-10-28
1 stop
$136
—
2026-11-11
1 stop
$136
—
2027-03-02
1 stop
$136
—
2027-03-16
1 stop
$144
—
2026-10-24
1 stop
$145
—
2026-11-20
1 stop
$146
—
2026-10-22
1 stop
$146
Southwest Airlines
2026-12-08
1 stop
$179
—
2026-12-02
1 stop
$200
—
2027-01-06
1 stop
$200
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 $107, compared with a typical $211 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.