Cheapest return flights from Boston to San Juan in September from 183€

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

22 Sep - 29 Sep United
21 Sep - 04 Oct United
12 Sep - 14 Sep Delta direct
06 Sep - 08 Sep Delta direct
22 Sep - 29 Sep Delta direct
21 Sep - 04 Oct Delta direct
14 Sep - 21 Sep United
04 Sep - 07 Sep United
04 Sep - 08 Sep United

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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