AirHint found the following cheapest return flights from Boston (BOS) to San Juan (SJU) in October 2026 (see full year).
Return flights
| 18 Oct - 31 Oct | Delta | direct | |
| 28 Oct - 03 Nov | United | ||
| 16 Oct - 19 Oct | Southwest Airlines | ||
| 16 Oct - 19 Oct | Delta | direct | |
| 09 Oct - 19 Oct | Delta | direct |
Also check the deals for one-way flights from Boston to San Juan in October.
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