Cheapest return flights from Philadelphia to St. Thomas in December from $426

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

Return flights

22 Dec - 26 Dec Spirit Airlines
01 Dec - 07 Dec Spirit Airlines
18 Dec - 17 Jan Spirit Airlines
17 Dec - 18 Jan Spirit Airlines
18 Dec - 16 Jan Spirit Airlines
28 Dec - 16 Jan Spirit Airlines
23 Dec - 01 Jan Spirit Airlines
22 Dec - 01 Jan Spirit Airlines
23 Dec - 27 Dec Frontier Airlines
28 Dec - 17 Jan Spirit Airlines
21 Dec - 01 Jan Spirit Airlines
18 Dec - 01 Jan Spirit Airlines
27 Dec - 16 Jan Spirit Airlines

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

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