Philadelphia to St Louis

PHLSTL

Fly from Philadelphia to St Louis starting at USD 78 with Frontier Airlines.Best fare available on Sep 21, 2026.Limited seats. Better plans. Book before it's gone.

Philadelphia to St Louis cheapest flights this week

15 Aug
Frontier Airlines
17:52PHL
00:59STL
1 StopUSD 170VIEW DEAL
15 Aug
American Airlines
22:01PHL
00:34STL
DirectUSD 194VIEW DEAL
9 Sept
Frontier Airlines
08:41PHL
14:10STL
1 StopUSD 86VIEW DEAL
20 Sept
Frontier Airlines
17:32PHL
14:10STL
1 StopUSD 80VIEW DEAL
21 Sept
Frontier Airlines
08:41PHL
14:10STL
1 StopUSD 78VIEW DEAL
19 Oct
Frontier Airlines
10:15PHL
20:39STL
1 StopUSD 134VIEW DEAL

Philadelphia to St Louis monthly flight fare trend

Aug
from USD 170
Sep
from USD 78
Oct
from USD 134
Nov
No flights
Dec
No flights
Jan
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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