Cheapest one-way flights from Boston to San Juan in May from 90€

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

One-Way flights

18 May Frontier Airlines
05 May Frontier Airlines
02 May Frontier Airlines
04 May Frontier Airlines
01 May Frontier Airlines
10 May Frontier Airlines
19 May Spirit Airlines
12 May Spirit Airlines
11 May Spirit Airlines
31 May Spirit Airlines

Also check the deals for return flights from Boston to San Juan in May.

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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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