AirHint found the following cheapest return flights from San Juan (SJU) to Boston (BOS) in August 2026 (see full year).

Return flights

11 Aug - 12 Aug	Spirit Airlines	direct
11 Aug - 17 Aug	Spirit Airlines
12 Aug - 17 Aug	Spirit Airlines
11 Aug - 17 Aug	Spirit Airlines	direct
12 Aug - 17 Aug	Spirit Airlines	direct
18 Aug - 20 Aug	Spirit Airlines
18 Aug - 20 Aug	Spirit Airlines	direct
01 Aug - 11 Aug	Spirit Airlines	direct
01 Aug - 12 Aug	Spirit Airlines	direct
13 Aug - 17 Aug	Spirit Airlines

Also check the deals for one-way flights from San Juan to Boston 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 Boston in August from $211

Return flights