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

Return flights

12 Oct - 16 Oct	British Airways	direct
19 Oct - 23 Oct	British Airways	direct
05 Oct - 09 Oct	British Airways	direct
14 Oct - 16 Oct	British Airways
04 Oct - 16 Oct	Iberia
05 Oct - 08 Oct	British Airways
07 Oct - 10 Oct	British Airways
02 Oct - 09 Oct	British Airways
09 Oct - 13 Oct	British Airways
05 Oct - 19 Oct	British Airways	direct
30 Oct - 02 Nov	British Airways
26 Oct - 02 Nov	British Airways	direct
31 Oct - 02 Nov	British Airways

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

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 London to San Sebastian in October from 221€

Return flights