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

Return flights

01 Oct - 16 Oct	KLM
01 Oct - 14 Oct	KLM
21 Oct - 26 Oct	KLM
01 Oct - 22 Oct	KLM
21 Oct - 28 Oct	KLM
01 Oct - 12 Oct	KLM
01 Oct - 16 Nov	KLM
06 Oct - 26 Oct	KLM
01 Oct - 07 Oct	KLM
05 Oct - 12 Oct	KLM
01 Oct - 06 Oct	KLM
23 Oct - 06 Nov	KLM
20 Oct - 11 Nov	KLM
23 Oct - 04 Nov	KLM
20 Oct - 06 Nov	KLM
05 Oct - 06 Nov	KLM
20 Oct - 04 Nov	KLM
23 Oct - 08 Nov	KLM
27 Oct - 06 Nov	KLM
22 Oct - 06 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 $810

Return flights