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

Return flights

21 Apr - 06 May	SWISS
28 Apr - 06 May	SWISS
14 Apr - 06 May	SWISS
08 Apr - 22 Apr	KLM
07 Apr - 15 Apr	SWISS
14 Apr - 22 Apr	SWISS
09 Apr - 14 Apr	KLM
14 Apr - 21 Apr	KLM
07 Apr - 22 Apr	SWISS
09 Apr - 16 Apr	KLM
28 Apr - 05 May	Lufthansa
08 Apr - 20 Apr	KLM
07 Apr - 21 Apr	SWISS
09 Apr - 23 Apr	KLM
29 Apr - 06 May	SWISS
24 Apr - 04 May	KLM
28 Apr - 08 May	SWISS
28 Apr - 15 May	SWISS
12 Apr - 20 May	KLM
23 Apr - 08 May	KLM

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

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 April from $836

Return flights