Cheapest return flights from Boston to San Juan in May from $187

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

Return flights

05 May - 19 May Spirit Airlines
01 May - 08 May Frontier Airlines
12 May - 19 May Spirit Airlines
12 May - 13 May Spirit Airlines
05 May - 06 May Spirit Airlines
04 May - 09 May Frontier Airlines
13 May - 19 May Spirit Airlines
11 May - 14 May Frontier Airlines
15 May - 19 May Frontier Airlines
07 May - 13 May Frontier Airlines
26 May - 03 Jun jetBlue direct
23 May - 02 Jun jetBlue direct
27 May - 03 Jun jetBlue direct
19 May - 03 Jun Spirit Airlines
13 May - 02 Jun Spirit Airlines
19 May - 02 Jun Spirit Airlines
24 May - 02 Jun jetBlue direct
31 May - 05 Jun Delta direct
25 May - 03 Jun Delta direct
12 May - 01 Jun Spirit Airlines

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

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