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

Return flights

27 Jul - 16 Aug	Spirit Airlines
28 Jul - 01 Aug	Spirit Airlines
11 Jul - 18 Jul	Spirit Airlines
08 Jul - 18 Jul	Spirit Airlines
05 Jul - 18 Jul	Spirit Airlines
08 Jul - 10 Jul	Spirit Airlines
27 Jul - 17 Aug	Spirit Airlines
05 Jul - 10 Jul	Spirit Airlines
02 Jul - 18 Jul	Spirit Airlines
03 Jul - 18 Jul	Spirit Airlines
02 Jul - 10 Jul	Spirit Airlines
03 Jul - 10 Jul	Spirit Airlines
05 Jul - 07 Jul	Spirit Airlines

Also check the deals for one-way flights from Boston 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 Boston to St. Thomas in July from $317

Return flights