Cheapest return flights from Boston to San Juan in September from $248

Best time to book flights for Boston (BOS) to San Juan (SJU) flights at AirHint

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

Return flights

17 Sep - 21 Sep Spirit Airlines
03 Sep - 29 Sep Delta direct
25 Sep - 29 Sep Delta direct
06 Sep - 09 Sep Delta direct
13 Sep - 16 Sep Delta direct
17 Sep - 21 Sep Delta direct
06 Sep - 08 Sep Spirit Airlines
06 Sep - 08 Sep Delta direct
05 Sep - 07 Sep Delta direct
11 Sep - 14 Sep Delta direct

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

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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