AirHint found the following cheapest return flights from San Sebastian (EAS) to Porto (OPO) in December 2025 (see full year).
Return flights
| 07 Dec - 11 Dec | Iberia | ||
| 03 Dec - 10 Dec | Iberia | ||
| 27 Dec - 03 Jan | Iberia | ||
| 05 Dec - 08 Dec | Iberia | ||
| 30 Dec - 02 Jan | Vueling Airlines |
Also check the deals for one-way flights from San Sebastian to Porto in December.
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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
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