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

Return flights

21 Oct - 04 Nov	SWISS
02 Oct - 12 Oct	KLM
02 Oct - 20 Oct	KLM
01 Oct - 16 Oct	KLM
03 Oct - 22 Oct	SWISS
02 Oct - 09 Oct	KLM
02 Oct - 22 Oct	KLM
21 Oct - 25 Nov	KLM
28 Oct - 05 Nov	SWISS
02 Oct - 14 Oct	KLM
21 Oct - 29 Oct	Lufthansa
29 Oct - 13 Nov	KLM
28 Oct - 03 Nov	Lufthansa
21 Oct - 28 Oct	Lufthansa
28 Oct - 12 Nov	Lufthansa
22 Oct - 26 Oct	KLM
22 Oct - 20 Nov	KLM
27 Oct - 12 Nov	Lufthansa
28 Oct - 25 Nov	KLM
31 Oct - 18 Nov	KLM

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 678€

Return flights