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

Return flights

11 Dec - 15 Dec	Spirit Airlines
30 Dec - 10 Jan	Spirit Airlines
30 Dec - 07 Jan	Spirit Airlines
29 Dec - 10 Jan	Spirit Airlines
05 Dec - 09 Dec	jetBlue
22 Dec - 25 Dec	Spirit Airlines
23 Dec - 10 Jan	Spirit Airlines
28 Dec - 10 Jan	Spirit Airlines
18 Dec - 17 Jan	Spirit Airlines
01 Dec - 07 Dec	Frontier Airlines
11 Dec - 01 Jan	Spirit Airlines
30 Dec - 17 Jan	Spirit Airlines
29 Dec - 17 Jan	Spirit Airlines
23 Dec - 01 Jan	Frontier Airlines
26 Dec - 31 Dec	Spirit Airlines

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

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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Cheapest return flights from Philadelphia to St. Thomas in December from $295

Return flights