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

Return flights

04 Dec - 08 Dec	United	direct
24 Dec - 29 Dec	United	direct
01 Dec - 07 Dec	Frontier Airlines
01 Dec - 07 Dec	United	direct
22 Dec - 29 Dec	United	direct
22 Dec - 06 Jan	United	direct
28 Dec - 02 Jan	Frontier Airlines
24 Dec - 02 Jan	Frontier Airlines
23 Dec - 03 Jan	Delta
18 Dec - 03 Jan	Delta

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 391€

Return flights