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Cheap flights from St Louis (STL) to Philadelphia (PHL)

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1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
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How to find the cheapest flight from St Louis (STL) to Philadelphia (PHL)

How to find the cheapest flight from St Louis (STL) to Philadelphia (PHL)
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How to find the cheapest flight from St Louis (STL) to Philadelphia (PHL)
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How to find the cheapest flight from St Louis (STL) to Philadelphia (PHL)
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Cheap flights from St Louis to Philadelphia in June , July 2026

30 Jun - 28 Jul $ 194.00
STL
St Louis
Frontier Airlines
1 STOPS
PHL
Philadelphia
PHL
Philadelphia
Frontier Airlines
1 STOPS
STL
St Louis
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12 Jun - 01 Jul $ 1,037.00
STL
St Louis
Alaska Airlines
1 STOPS
PHL
Philadelphia
PHL
Philadelphia
Alaska Airlines
1 STOPS
STL
St Louis
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07 Jun - 01 Jul $ 1,124.00
STL
St Louis
Alaska Airlines
1 STOPS
PHL
Philadelphia
PHL
Philadelphia
Alaska Airlines
1 STOPS
STL
St Louis
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Last minute flights from St Louis to Philadelphia

28 Jun - 30 Jun $ 206.00
STL
St Louis
Frontier Airlines
1 STOPS
PHL
Philadelphia
PHL
Philadelphia
Frontier Airlines
1 STOPS
STL
St Louis
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12 Jun - 30 Jun $ 1,078.00
STL
St Louis
Alaska Airlines
1 STOPS
PHL
Philadelphia
PHL
Philadelphia
Alaska Airlines
1 STOPS
STL
St Louis
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08 Jun - 30 Jun $ 1,165.00
STL
St Louis
Alaska Airlines
1 STOPS
PHL
Philadelphia
PHL
Philadelphia
Alaska Airlines
1 STOPS
STL
St Louis
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One-way flights to Philadelphia from St Louis

6:31 PM - 5:05 AM
Frontier Airlines
1 Stops
11h 48m
STL - PHL
$ 97
Kiwi
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8:10 AM - 11:33 AM
United Airlines
1 Stops
5h 37m
STL - PHL
$ 474
Kiwi
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8:43 AM - 12:55 PM
United Airlines
1 Stops
4h 26m
STL - PHL
$ 484
Kiwi
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How to find the cheapest flight from St Louis (STL) to Philadelphia (PHL)

Related info for your journey
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How to find the cheapest flight from St Louis (STL) to Philadelphia (PHL)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Philadelphia (PHL)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.