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

Return flights

13 May - 19 May	Spirit Airlines
18 May - 19 May	Spirit Airlines
13 May - 18 May	Spirit Airlines
07 May - 19 May	Spirit Airlines
07 May - 13 May	Spirit Airlines
13 May - 18 May	Delta	direct
07 May - 10 May	Spirit Airlines
07 May - 18 May	Spirit Airlines
13 May - 25 May	Spirit Airlines
20 May - 25 May	Spirit Airlines

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

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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Cheapest return flights from Boston to San Juan in May from 151€

Return flights