AirHint found the following cheapest return flights from Boston (BOS) to San Juan (SJU) in January 2027 (see full year).
Return flights
| 13 Jan - 20 Jan | Delta | direct | |
| 05 Jan - 15 Jan | Delta | direct | |
| 09 Jan - 16 Jan | Delta | direct | |
| 16 Jan - 23 Jan | Delta | ||
| 01 Jan - 04 Jan | United | ||
| 01 Jan - 04 Jan | Delta | direct |
Also check the deals for one-way flights from Boston to San Juan in January.
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