AirHint found the following cheapest return flights from San Juan (SJU) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 12 Dec - 16 Dec | Lufthansa | ||
| 01 Dec - 09 Dec | KLM | ||
| 30 Dec - 09 Jan | United |
Also check the deals for one-way flights from San Juan to Lisbon in December.
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