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

Return flights

01 Apr - 09 Apr	Air China
01 Apr - 11 Apr	Air China
03 Apr - 12 Apr	Air China
03 Apr - 09 Apr	Air China
03 Apr - 11 Apr	Air China
01 Apr - 23 Apr	Air China
22 Apr - 12 May	Air China
01 Apr - 14 Apr	Air China
01 Apr - 07 Apr	Air China
04 Apr - 18 Apr	Air China
04 Apr - 11 Apr	Air China
22 Apr - 04 May	Air China
23 Apr - 05 May	Shenzhen Airlines
26 Apr - 08 May	Malaysia Airlines
26 Apr - 02 May	Malaysia Airlines
25 Apr - 09 May	Air China
01 Apr - 05 May	China Southern
14 Apr - 06 May	Finnair
24 Apr - 06 May	LOT
27 Apr - 05 May	Air China

Also check the deals for one-way flights from Seoul to London 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 Seoul to London in April from 476€

Return flights