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.

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 Washington to St. Thomas in December from $395

Return flights