Cheapest one-way flights from Philadelphia to St. Thomas in December from $124

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

One-Way flights

05 Dec Spirit Airlines
23 Dec Frontier Airlines
22 Dec Spirit Airlines
18 Dec Frontier Airlines
21 Dec Spirit Airlines
19 Dec jetBlue
28 Dec Spirit Airlines
20 Dec Spirit Airlines
22 Dec American Airlines direct
27 Dec Spirit Airlines

Also check the deals for return flights from Philadelphia to St. Thomas in December.

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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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