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

Return flights

21 Apr - 06 May	Lufthansa
22 Apr - 08 May	Air China
23 Apr - 25 May	Air China
20 Apr - 11 May	SWISS
29 Apr - 06 May	Lufthansa
27 Apr - 11 May	Lufthansa
28 Apr - 12 May	Lufthansa
23 Apr - 04 May	Air China
20 Apr - 07 May	China Southern
01 Apr - 21 Apr	Air India
27 Apr - 08 May	Air China
07 Apr - 17 Apr	Air China
14 Apr - 29 Apr	SWISS
17 Apr - 25 Apr	SWISS
22 Apr - 27 Apr	Lufthansa
14 Apr - 22 Apr	SWISS
07 Apr - 21 Apr	Air India
23 Apr - 26 Apr	Air India
15 Apr - 21 Apr	Air India
01 Apr - 05 Apr	Air India

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 $627

Return flights