Cheapest return flights from Boston to San Juan in September from $139

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

Return flights

17 Sep - 20 Sep Spirit Airlines
16 Sep - 20 Sep Spirit Airlines
06 Sep - 20 Sep Spirit Airlines
03 Sep - 20 Sep Spirit Airlines
13 Sep - 20 Sep Spirit Airlines
08 Sep - 20 Sep Spirit Airlines
15 Sep - 20 Sep Spirit Airlines
07 Sep - 20 Sep Spirit Airlines
17 Sep - 26 Sep Spirit Airlines
17 Sep - 18 Sep Spirit Airlines
17 Sep - 03 Oct Spirit Airlines
17 Sep - 08 Oct Spirit Airlines
17 Sep - 01 Oct Spirit Airlines
17 Sep - 07 Oct Spirit Airlines
17 Sep - 02 Oct Spirit Airlines
17 Sep - 06 Oct Spirit Airlines
16 Sep - 03 Oct Spirit Airlines
16 Sep - 01 Oct Spirit Airlines
16 Sep - 07 Oct Spirit Airlines
16 Sep - 02 Oct Spirit Airlines

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.

Book a cheap hotel in San Juan

Cheap car rent in San Juan

Feel free to contact us with any feedback or request another flight research.