Cheapest return BOS–SJU flights, September

AirHint found the following cheapest return flights from Boston (BOS) to San Juan (SJU) in September 2026 (see full year).

Return flights

21 Sep - 24 Sep Delta direct
14 Sep - 17 Sep Delta
24 Sep - 28 Sep Delta
25 Sep - 28 Sep Delta
02 Sep - 05 Sep Delta direct
17 Sep - 21 Sep Delta
18 Sep - 21 Sep Southwest Airlines
18 Sep - 21 Sep Delta direct
18 Sep - 05 Oct United

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

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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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