Cheapest return flights from Philadelphia to St. Thomas in September from $298

AirHint found the following cheapest return flights from Philadelphia (PHL) to St. Thomas (STT) in September 2025 (see full year).

Return flights

28 Sep - 03 Oct Spirit Airlines
26 Sep - 29 Sep Spirit Airlines
15 Sep - 19 Sep Spirit Airlines
14 Sep - 19 Sep Spirit Airlines
14 Sep - 18 Sep Frontier Airlines
15 Sep - 18 Sep Spirit Airlines
15 Sep - 22 Sep Spirit Airlines
20 Sep - 27 Sep Spirit Airlines
09 Sep - 12 Sep Spirit Airlines
30 Sep - 04 Oct Delta
23 Sep - 27 Sep American Airlines

Also check the deals for one-way flights from Philadelphia to St. Thomas in September.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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