AirHint found the following cheapest return flights from Boston (BOS) to San Juan (SJU) in December 2026 (see full year).
Return flights
| 11 Dec - 14 Dec | Delta | ||
| 23 Dec - 07 Jan | Delta | ||
| 20 Dec - 08 Jan | United | ||
| 20 Dec - 08 Jan | Delta | direct | |
| 26 Dec - 01 Jan | United | ||
| 22 Dec - 02 Jan | Southwest Airlines | ||
| 22 Dec - 02 Jan | Delta | direct |
Also check the deals for one-way flights from Boston to San Juan in December.
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