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

Return flights

28 Apr - 06 May	SWISS
07 Apr - 05 May	Lufthansa
08 Apr - 29 Apr	Lufthansa
28 Apr - 13 May	SWISS
07 Apr - 22 Apr	Lufthansa
15 Apr - 29 Apr	SWISS
15 Apr - 21 Apr	Lufthansa
07 Apr - 14 Apr	KLM
20 Apr - 05 May	Lufthansa
08 Apr - 06 May	Lufthansa
14 Apr - 23 Apr	Lufthansa
06 Apr - 13 Apr	KLM
09 Apr - 30 Apr	Lufthansa
23 Apr - 19 May	Lufthansa
13 Apr - 27 Apr	Lufthansa
20 Apr - 30 Apr	SWISS
28 Apr - 12 May	KLM
22 Apr - 06 May	KLM
29 Apr - 13 May	KLM
09 Apr - 07 May	Lufthansa

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 731€

Return flights