AirHint found the following cheapest return flights from London (LCY) to Seoul (ICN) in May 2026 (see full year).

Return flights

05 May - 20 May	SWISS
12 May - 20 May	SWISS
21 May - 01 Jun	KLM
17 May - 27 May	KLM
12 May - 19 May	KLM
14 May - 20 May	KLM
12 May - 23 May	KLM
05 May - 23 May	KLM
14 May - 25 May	SWISS
29 May - 07 Jun	KLM
29 May - 11 Jun	SWISS
21 May - 25 May	KLM
09 May - 24 May	SWISS
25 May - 09 Jun	Lufthansa
29 May - 09 Jun	ITA Airways
29 May - 06 Jun	KLM
27 May - 07 Jun	ITA Airways
30 May - 06 Jun	KLM
27 May - 10 Jun	KLM
28 May - 10 Jun	KLM

Also check the deals for one-way flights from London to Seoul in May.

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 May from $849

Return flights