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

Return flights

10 Jul - 14 Jul	Frontier Airlines
17 Jul - 21 Jul	Frontier Airlines
31 Jul - 14 Aug	United	direct
30 Jul - 13 Aug	United
28 Jul - 12 Aug	United	direct
29 Jul - 12 Aug	United	direct
22 Jul - 05 Aug	United	direct
21 Jul - 04 Aug	United
29 Jul - 06 Aug	United	direct
20 Jul - 03 Aug	United
28 Jul - 31 Jul	Delta
27 Jul - 31 Jul	Delta
28 Jul - 11 Aug	United
23 Jul - 06 Aug	United	direct
23 Jul - 28 Jul	Delta
23 Jul - 29 Jul	United	direct
15 Jul - 29 Jul	United	direct
09 Jul - 23 Jul	United	direct
11 Jul - 25 Jul	United
11 Jul - 25 Jul	United	direct

Also check the deals for one-way flights from Washington to St. Thomas in July.

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 July from 107€

Return flights