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

Return flights

18 Dec - 21 Dec	United
18 Dec - 20 Dec	United
13 Dec - 17 Dec	United
23 Dec - 30 Dec	United	direct
18 Dec - 22 Dec	United	direct
15 Dec - 19 Dec	United	direct
24 Dec - 30 Dec	United	direct
24 Dec - 29 Dec	United	direct
25 Dec - 30 Dec	United
12 Dec - 15 Dec	Frontier Airlines
26 Dec - 03 Jan	Frontier Airlines
31 Dec - 04 Jan	Frontier Airlines
31 Dec - 04 Jan	United	direct
29 Dec - 02 Jan	United

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 203€

Return flights