Cheapest one-way flights from Boston to San Juan in January from 71€

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

One-Way flights

06 Jan Frontier Airlines direct
04 Jan Frontier Airlines direct
27 Jan Spirit Airlines direct
13 Jan Spirit Airlines direct
28 Jan Spirit Airlines direct
22 Jan Spirit Airlines direct
29 Jan Spirit Airlines direct
08 Jan Frontier Airlines direct
05 Jan Spirit Airlines direct
01 Jan Spirit Airlines direct

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

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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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