Cheapest one-way flights from Boston to San Juan in December from 76€

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

One-Way flights

31 Dec Spirit Airlines direct
03 Dec Spirit Airlines
11 Dec Spirit Airlines
07 Dec Spirit Airlines
10 Dec Spirit Airlines
08 Dec jetBlue direct
04 Dec Frontier Airlines
05 Dec Frontier Airlines
02 Dec Spirit Airlines
30 Dec Spirit Airlines 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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