St. Louis Gateway Arch
STL
Saint Louis
Philadelphia skyline with City Hall
PHL
Philadelphia

Saint Louis → Philadelphia

Southwest Airlines · Round Trip · Nonstop

Save $196 (29% off)
Compared to the typical price of $686
$516$686

per person · round trip

Book This Deal

Flight Details

Cabin
Economy
Departs
Jun 26, 2026
Returns
Jul 5, 2026

Price History

Avg: $505
Low: $489
High: $516
$480$497$513$530Mar 23Mar 29Apr 3

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