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

Return flights

04 Aug - 08 Aug	Frontier Airlines	direct
28 Aug - 31 Aug	jetBlue	direct
22 Aug - 24 Aug	jetBlue	direct
28 Aug - 29 Aug	jetBlue	direct
02 Aug - 06 Aug	Cape Air	direct
18 Aug - 30 Aug	Spirit Airlines
18 Aug - 27 Aug	Spirit Airlines
18 Aug - 05 Sep	Spirit Airlines
31 Aug - 05 Sep	Spirit Airlines
18 Aug - 29 Aug	Spirit Airlines
18 Aug - 31 Aug	Spirit Airlines
01 Aug - 05 Aug	Cape Air	direct
17 Aug - 05 Sep	Spirit Airlines
15 Aug - 05 Sep	Spirit Airlines
28 Aug - 05 Sep	Spirit Airlines

Also check the deals for one-way flights from St. Thomas to San Juan 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 St. Thomas to San Juan in August from $72

Return flights