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

Return flights

16 Dec - 23 Dec	United	direct
25 Dec - 28 Jan	United
23 Dec - 30 Dec	United
29 Dec - 31 Dec	United
25 Dec - 31 Dec	United
25 Dec - 29 Dec	United
24 Dec - 29 Dec	United	direct
12 Dec - 15 Dec	United	direct
26 Dec - 30 Dec	Frontier Airlines
31 Dec - 04 Jan	Frontier Airlines
26 Dec - 29 Dec	Southern Airways Express
29 Dec - 02 Jan	Southern Airways Express
29 Dec - 02 Jan	United	direct
31 Dec - 04 Jan	United	direct
26 Dec - 30 Dec	United	direct
30 Dec - 03 Jan	Frontier Airlines

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 $270

Return flights