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

Return flights

19 May - 04 Jun	Lufthansa
05 May - 20 May	SWISS
21 May - 07 Jun	KLM
20 May - 03 Jun	Lufthansa
21 May - 27 May	KLM
21 May - 01 Jun	KLM
21 May - 10 Jun	KLM
14 May - 01 Jun	KLM
12 May - 21 May	KLM
18 May - 27 May	KLM
17 May - 01 Jun	KLM
30 May - 07 Jun	KLM
05 May - 28 May	SWISS
21 May - 04 Jun	KLM
21 May - 06 Jun	KLM
20 May - 27 May	KLM
06 May - 16 May	Lufthansa
04 May - 25 May	Lufthansa
04 May - 11 May	Lufthansa
11 May - 24 May	Lufthansa

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 653€

Return flights