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

Return flights

03 Dec - 10 Dec	Delta	direct
11 Dec - 16 Dec	jetBlue
11 Dec - 16 Dec	Delta	direct
24 Dec - 30 Dec	jetBlue
24 Dec - 31 Dec	jetBlue	direct
24 Dec - 30 Dec	jetBlue	direct
23 Dec - 27 Dec	jetBlue
23 Dec - 27 Dec	jetBlue	direct
25 Dec - 31 Dec	jetBlue	direct
28 Dec - 04 Jan	jetBlue
18 Dec - 28 Dec	jetBlue
27 Dec - 04 Jan	jetBlue
26 Dec - 01 Jan	jetBlue	direct
23 Dec - 02 Jan	jetBlue
23 Dec - 02 Jan	jetBlue	direct
23 Dec - 03 Jan	jetBlue	direct
27 Dec - 04 Jan	Delta	direct

Also check the deals for one-way flights from Boston to San Juan in December.

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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Cheapest return flights from Boston to San Juan in December from $324

Return flights