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

Return flights

18 Oct - 25 Oct	China Southern
15 Oct - 22 Oct	China Southern
12 Oct - 20 Oct	China Southern
12 Oct - 21 Oct	China Southern
24 Oct - 28 Oct	Air China
13 Oct - 20 Oct	China Southern
14 Oct - 20 Oct	China Southern
17 Oct - 13 Nov	China Southern
13 Oct - 09 Nov	China Southern
30 Oct - 06 Nov	China Southern
22 Oct - 28 Oct	Air China
13 Oct - 04 Nov	Air China
10 Oct - 13 Oct	China Eastern
17 Oct - 19 Oct	China Southern
29 Oct - 04 Nov	Air China
26 Oct - 04 Nov	Air China
27 Oct - 11 Nov	Air China
28 Oct - 18 Nov	Air China
23 Oct - 04 Nov	Air China
20 Oct - 02 Nov	Air China

Also check the deals for one-way flights from Seoul to London 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 Seoul to London in October from $523

Return flights