AirHint found the following cheapest return flights from San Sebastian (EAS) to Singapore (SIN) in December 2025 (see full year).
Return flights
| 10 Dec - 21 Jan | Iberia | ||
| 10 Dec - 20 Jan | Iberia | ||
| 11 Dec - 21 Jan | Vueling Airlines |
Also check the deals for one-way flights from San Sebastian to Singapore in December.
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