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.

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 $293

Return flights