AirHint found the following cheapest return flights from San Sebastian (EAS) to London (STN) in December 2025 (see full year).

Return flights

06 Dec - 09 Dec	Iberia
02 Dec - 07 Dec	Volotea
06 Dec - 13 Dec	Iberia
11 Dec - 13 Dec	Iberia
28 Dec - 04 Jan	Iberia
20 Dec - 24 Dec	Iberia
10 Dec - 12 Dec	Iberia
20 Dec - 23 Dec	Iberia
06 Dec - 08 Dec	Iberia
12 Dec - 14 Dec	Binter Canarias
08 Dec - 13 Dec	Iberia
29 Dec - 04 Jan	Iberia
30 Dec - 05 Jan	Vueling Airlines

Also check the deals for one-way flights from San Sebastian to London in December.

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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Cheapest return flights from San Sebastian to London in December from $248

Return flights