Cheapest return flights from Washington to St. Thomas in December from $395

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

Return flights

07 Dec - 11 Dec United
11 Dec - 15 Dec United
01 Dec - 07 Dec United direct
18 Dec - 22 Dec United direct
10 Dec - 14 Dec United
22 Dec - 26 Dec Allegiant Air
20 Dec - 29 Dec Frontier Airlines
04 Dec - 07 Dec United direct
04 Dec - 08 Dec United direct
24 Dec - 29 Dec United
31 Dec - 04 Jan Frontier Airlines
28 Dec - 04 Jan Frontier Airlines
31 Dec - 04 Jan United direct
28 Dec - 04 Jan United direct

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

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