Cheapest return flights from Boston to San Juan in September from 172€

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

Return flights

02 Sep - 05 Sep Spirit Airlines direct
02 Sep - 08 Sep Spirit Airlines direct
07 Sep - 08 Sep Spirit Airlines direct
02 Sep - 06 Sep Spirit Airlines direct
22 Sep - 29 Sep Delta direct
25 Sep - 29 Sep Delta direct
11 Sep - 15 Sep Delta direct
30 Sep - 05 Oct Delta direct
18 Sep - 21 Sep Delta direct

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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