Cheapest one-way flights from Boston to San Juan in December from 85€

AirHint found the following cheapest one-way flights from Boston (BOS) to San Juan (SJU) in December 2025 (see full year).

One-Way flights

09 Dec United
08 Dec United
13 Dec Spirit Airlines
31 Dec Spirit Airlines direct
03 Dec Delta
01 Dec United
05 Dec Frontier Airlines
12 Dec Frontier Airlines
11 Dec Spirit Airlines
08 Dec jetBlue direct

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

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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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