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

Return flights

01 Mar - 05 Mar	Frontier Airlines	direct
01 Mar - 03 Mar	Spirit Airlines	direct
01 Mar - 06 Mar	United
09 Mar - 13 Mar	United
17 Mar - 24 Mar	jetBlue	direct
07 Mar - 13 Mar	United
12 Mar - 17 Mar	jetBlue	direct
13 Mar - 17 Mar	jetBlue
14 Mar - 22 Mar	jetBlue
05 Mar - 09 Mar	Frontier Airlines

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

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 March from 142€

Return flights