AirHint found the following cheapest one-way flights from San Juan (SJU) to Boston (BOS) in August 2025 (see full year).

One-Way flights

07 Aug	Spirit Airlines	direct
21 Aug	Spirit Airlines
23 Aug	Spirit Airlines
06 Aug	Spirit Airlines
02 Aug	Spirit Airlines
16 Aug	Spirit Airlines
06 Aug	jetBlue	direct
10 Aug	jetBlue	direct
02 Aug	jetBlue	direct
13 Aug	jetBlue	direct

Also check the deals for return 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 one-way flights from San Juan to Boston in August from $78

One-Way flights