FFL Helper
Philadelphia PHL
$177
STL → PHL · Frontier Airlines
FFL Helper / St Louis / Philadelphia / August 2026
STL → PHL · 2026-08
St Louis to Philadelphia in August 2026
Dated one-way fares from St Louis to Philadelphia in August 2026. Use the calendar to see which days are cheaper.
Lowest this month
$177
Highest this month
$177
Sample fare
$177
Airports
STL–PHL
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Other months: August 2026 · Full route
August 2026 price calendar
August 2026
From $177
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$177
Dated fares
Booking STL to PHL in August 2026
This page is only August 2026 on the St Louis 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 St Louis to Philadelphia in August 2026.