Cheapest one-way flights from Boston to San Juan in December from $108

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

One-Way flights

07 Dec Spirit Airlines
06 Dec Spirit Airlines
05 Dec Spirit Airlines
12 Dec Frontier Airlines
14 Dec Frontier Airlines
01 Dec jetBlue direct
31 Dec jetBlue direct
05 Dec jetBlue direct
30 Dec Spirit Airlines
30 Dec jetBlue direct

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

Skyscanner

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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