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

2 Oct
Frontier Airlines
10:10PHL
17:34STL
1 StopUSD 205VIEW DEAL
4 Oct
Frontier Airlines
10:10PHL
17:34STL
1 StopUSD 206VIEW DEAL
19 Oct
Frontier Airlines
10:15PHL
20:39STL
1 StopUSD 134VIEW DEAL

Philadelphia to St Louis monthly flight fare trend

Sep
No flights
Oct
from USD 134
Nov
No flights
Dec
No flights
Jan
No flights
Feb
No flights

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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