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

Return flights

26 May - 30 Jun	KLM
12 May - 20 May	SWISS
06 May - 14 May	Lufthansa
26 May - 29 Jun	KLM
25 May - 28 Jun	KLM
07 May - 18 May	Luxair
12 May - 03 Jun	SWISS
26 May - 03 Jun	SWISS
19 May - 27 May	KLM
25 May - 30 Jun	KLM
26 May - 14 Jun	KLM
19 May - 28 May	KLM
28 May - 30 Jun	KLM
25 May - 29 Jun	KLM
12 May - 18 May	KLM
06 May - 19 May	KLM
05 May - 19 May	KLM
12 May - 28 Jun	KLM
12 May - 26 May	KLM
18 May - 27 May	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 $816

Return flights