AirHint found the following cheapest return flights from San Juan (SJU) to St. Croix Island (STX) in August 2025 (see full year).

Return flights

07 Aug - 14 Aug	jetBlue	direct
08 Aug - 15 Aug	jetBlue	direct
10 Aug - 17 Aug	jetBlue	direct
11 Aug - 18 Aug	jetBlue	direct
13 Aug - 20 Aug	jetBlue	direct
29 Aug - 01 Sep	jetBlue	direct
18 Aug - 22 Aug	jetBlue	direct
05 Aug - 06 Aug	jetBlue	direct
08 Aug - 17 Aug	Spirit Airlines
08 Aug - 18 Aug	Spirit Airlines
08 Aug - 14 Aug	Spirit Airlines

Also check the deals for one-way flights from San Juan to St. Croix Island in August.

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 San Juan to St. Croix Island in August from 62€

Return flights