AirHint found the following cheapest return flights from San Sebastian (EAS) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 06 Dec - 09 Dec | Iberia | ||
| 22 Dec - 09 Jan | Iberia | ||
| 31 Dec - 07 Jan | Iberia | ||
| 12 Dec - 16 Dec | Iberia | ||
| 19 Dec - 20 Dec | Iberia | ||
| 28 Dec - 01 Jan | Iberia | ||
| 26 Dec - 30 Dec | Iberia | ||
| 29 Dec - 02 Jan | Iberia |
Also check the deals for one-way flights from San Sebastian to Lisbon in December.
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