Cheapest return flights from Boston to San Juan in August from $162

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

Return flights

10 Aug - 16 Aug Spirit Airlines
24 Aug - 27 Aug Frontier Airlines
23 Aug - 28 Aug Frontier Airlines
10 Aug - 13 Aug Spirit Airlines
21 Aug - 23 Aug Frontier Airlines
10 Aug - 27 Aug Spirit Airlines
10 Aug - 22 Aug Spirit Airlines
02 Aug - 07 Aug Frontier Airlines
09 Aug - 13 Aug Frontier Airlines
10 Aug - 12 Aug Spirit Airlines
20 Aug - 03 Sep Spirit Airlines
17 Aug - 03 Sep Spirit Airlines
19 Aug - 03 Sep Spirit Airlines
25 Aug - 03 Sep Spirit Airlines
25 Aug - 12 Sep Spirit Airlines
24 Aug - 03 Sep Spirit Airlines
24 Aug - 12 Sep Spirit Airlines
30 Aug - 03 Sep Spirit Airlines
30 Aug - 12 Sep Spirit Airlines
22 Aug - 03 Sep Spirit Airlines

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

Skyscanner

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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