AirHint found the following cheapest return flights from London (LHR) to Seoul (GMP) in October 2025 (see full year).

Return flights

27 Oct - 26 Nov	China Eastern
27 Oct - 05 Nov	China Eastern
25 Oct - 06 Nov	China Southern
21 Oct - 05 Nov	China Southern
21 Oct - 13 Nov	China Southern
22 Oct - 05 Nov	China Southern
20 Oct - 20 Nov	China Southern
20 Oct - 06 Nov	China Southern
20 Oct - 05 Nov	China Southern
02 Oct - 19 Nov	China Southern
02 Oct - 12 Oct	Air China
02 Oct - 23 Oct	Air China
02 Oct - 14 Oct	Air China
01 Oct - 21 Oct	Air China
02 Oct - 11 Oct	Air China
01 Oct - 24 Oct	Air China
01 Oct - 15 Oct	Air China
01 Oct - 14 Oct	Air China
02 Oct - 15 Oct	Air China
20 Oct - 23 Oct	China Southern

Also check the deals for one-way flights from London to Seoul 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 Seoul in October from 384€

Return flights