FFL Helper
Philadelphia PHL
$264
SEA → PHL · American Airlines
FFL Helper / Seattle / Philadelphia / September 2026
SEA → PHL · 2026-09
Seattle to Philadelphia in September 2026
Dated one-way fares from Seattle to Philadelphia in September 2026. Use the calendar to see which days are cheaper.
Lowest this month
$264
Highest this month
$264
Sample fare
$138
Airports
SEA–PHL
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Other months: August 2026 · September 2026 · Full route
September 2026 price calendar
September 2026
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Dated fares
Booking SEA to PHL in September 2026
This page is only September 2026 on the Seattle to Philadelphia route. Open the full route if you want the next months side by side.
Prices move as seats sell. Confirm the live itinerary before you book Seattle to Philadelphia in September 2026.