Philadelphia to St Louis
PHLSTL
Fly from Philadelphia to St Louis starting at USD 134 with Frontier Airlines.
Best fare available on Oct 19, 2026.
Limited seats. Better plans. Book before it's gone.
Philadelphia to St Louis cheapest flights this week
Philadelphia to St Louis monthly flight fare trend
Jul
No flights
Aug
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Sep
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Oct
from USD 134
Nov
No flights
Dec
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Airport Details
Origin
Philadelphia
Philadelphia International Airport (PHL)
Philadelphia, PHL
Zone
New York
Elev
36 ft
Destination
St Louis
St. Louis Lambert International Airport (STL)
St Louis, STL
Zone
Chicago
Elev
618 ft
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