Cheapest return flights from Washington to St. Thomas in December from $293

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

Return flights

09 Dec - 16 Dec American Airlines
02 Dec - 05 Dec United direct
22 Dec - 21 Jan United
30 Dec - 06 Jan Frontier Airlines
09 Dec - 16 Dec United direct
11 Dec - 15 Dec United
23 Dec - 30 Dec Frontier Airlines
18 Dec - 22 Dec United direct
01 Dec - 07 Dec United direct
23 Dec - 28 Dec Allegiant Air
10 Dec - 14 Dec United
04 Dec - 07 Dec United direct
30 Dec - 07 Jan United direct
31 Dec - 04 Jan Frontier Airlines
31 Dec - 04 Jan United direct

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

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