Cheapest return flights from Boston to San Juan in September from 181€

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

Return flights

24 Sep - 07 Oct Spirit Airlines
24 Sep - 03 Oct Spirit Airlines
24 Sep - 01 Oct Spirit Airlines
24 Sep - 30 Sep Spirit Airlines
23 Sep - 07 Oct Spirit Airlines
23 Sep - 03 Oct Spirit Airlines
23 Sep - 01 Oct Spirit Airlines
27 Sep - 01 Oct Spirit Airlines
24 Sep - 04 Oct Spirit Airlines
24 Sep - 08 Oct Spirit Airlines
24 Sep - 09 Oct Spirit Airlines
23 Sep - 30 Sep Spirit Airlines
21 Sep - 27 Sep Frontier Airlines
27 Sep - 30 Sep Spirit Airlines
20 Sep - 30 Sep Spirit Airlines
24 Sep - 29 Sep Spirit Airlines
25 Sep - 28 Sep Frontier Airlines
23 Sep - 29 Sep Spirit Airlines
24 Sep - 27 Sep Spirit Airlines
21 Sep - 29 Sep 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.

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