AirHint found the following cheapest return flights from Lisbon (LIS) to San Juan (SJU) in December 2025 (see full year).
Return flights
| 11 Dec - 05 Jan | Vueling Airlines | ||
| 12 Dec - 05 Jan | Ryanair | ||
| 17 Dec - 29 Dec | United | ||
| 14 Dec - 02 Jan | Wizz Air Malta | ||
| 19 Dec - 28 Dec | Lufthansa |
Also check the deals for one-way flights from Lisbon to San Juan in December.
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