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

Return flights

08 Oct - 22 Oct	LOT
22 Oct - 29 Oct	China Southern
30 Oct - 11 Nov	China Southern
30 Oct - 05 Nov	China Southern
29 Oct - 06 Nov	China Southern
13 Oct - 24 Oct	Finnair
15 Oct - 27 Oct	Finnair
13 Oct - 27 Oct	Finnair
23 Oct - 26 Oct	Lufthansa
29 Oct - 11 Nov	Finnair
13 Oct - 18 Oct	Air China
15 Oct - 21 Oct	Air China
13 Oct - 25 Oct	Air China
20 Oct - 25 Oct	Air China
27 Oct - 01 Nov	Air China
24 Oct - 01 Nov	Air China
24 Oct - 04 Nov	Air China
29 Oct - 01 Nov	Air China
29 Oct - 04 Nov	Finnair
29 Oct - 03 Nov	Finnair

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 540€

Return flights