Seattle to Philadelphia (SEA → PHL). We are tracking 9 fares on this route.
Cheapest tracked fare $121 · typical price $289 · you save about $168 (58%)
Cheapest fares we're tracking
Airline
Departs
Stops
Price
Frontier Airlines
2026-09-05
1 stop
$121
—
2026-10-07
1 stop
$143
—
2027-01-06
1 stop
$197
—
2026-09-23
1 stop
$197
—
2026-11-04
1 stop
$197
—
2026-12-02
1 stop
$197
—
2027-02-03
1 stop
$197
—
2026-09-30
1 stop
$197
United Airlines
2026-09-06
2 stops
$207
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 Seattle to Philadelphia get?
The cheapest fare we have tracked on this route is $121, compared with a typical $289 for a trip of this distance.
Is it cheaper to fly to Philadelphia 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 Seattle to Philadelphia 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.