AirHint found the following cheapest one-way flights from San Sebastian (EAS) to London (LCY) in September 2025 (see full year).

One-Way flights

04 Sep	Vueling Airlines
25 Sep	British Airways	direct
18 Sep	British Airways	direct
04 Sep	British Airways	direct
30 Sep	Vueling Airlines
11 Sep	British Airways	direct
10 Sep	Iberia
24 Sep	Volotea
15 Sep	Iberia
17 Sep	Vueling Airlines

Also check the deals for return flights from San Sebastian to London in September.

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 one-way flights from San Sebastian to London in September from $155

One-Way flights