AirHint found the following cheapest return flights from Boston (BOS) to San Juan (SJU) in December 2026 (see full year).

Return flights

25 Dec - 29 Dec	American Airlines
25 Dec - 31 Dec	American Airlines
22 Dec - 30 Dec	United
25 Dec - 01 Jan	American Airlines
29 Dec - 04 Jan	American Airlines
24 Dec - 28 Dec	jetBlue
26 Dec - 01 Jan	jetBlue
25 Dec - 01 Jan	Delta	direct
26 Dec - 02 Jan	jetBlue
29 Dec - 04 Jan	Delta	direct
22 Dec - 30 Dec	jetBlue	direct
27 Dec - 04 Jan	Delta	direct
26 Dec - 01 Jan	Delta	direct
24 Dec - 28 Dec	jetBlue	direct
25 Dec - 29 Dec	jetBlue	direct
26 Dec - 04 Jan	Delta	direct
25 Dec - 31 Dec	jetBlue	direct
26 Dec - 02 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 $586

Return flights