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

Return flights

04 Jul - 09 Jul	Allegiant Air
25 Jul - 27 Jul	Allegiant Air
16 Jul - 30 Jul	United
29 Jul - 06 Aug	United
24 Jul - 29 Jul	Allegiant Air
26 Jul - 30 Jul	United
03 Jul - 06 Jul	Allegiant Air
21 Jul - 30 Jul	United	direct
18 Jul - 01 Aug	United
27 Jul - 05 Aug	United
24 Jul - 07 Aug	United	direct
29 Jul - 12 Aug	United	direct
20 Jul - 03 Aug	United	direct
23 Jul - 06 Aug	United
30 Jul - 13 Aug	United
25 Jul - 08 Aug	United	direct
17 Jul - 22 Jul	United	direct
09 Jul - 23 Jul	United	direct
13 Jul - 16 Jul	American Airlines
31 Jul - 07 Aug	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 $413

Return flights