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

Return flights

22 Apr - 29 Apr	Finnair
02 Apr - 11 Apr	Finnair
01 Apr - 15 Apr	Finnair
14 Apr - 21 Apr	Finnair
01 Apr - 14 Apr	Finnair
20 Apr - 27 Apr	Finnair
22 Apr - 26 Apr	Finnair
23 Apr - 30 Apr	Finnair
20 Apr - 26 Apr	Finnair
06 Apr - 20 Apr	Finnair
29 Apr - 05 May	Finnair
29 Apr - 04 May	Finnair
29 Apr - 03 May	Finnair
24 Apr - 04 May	Finnair
30 Apr - 10 May	Finnair
30 Apr - 04 May	Etihad Airways
27 Apr - 09 May	Finnair
30 Apr - 16 May	Finnair
28 Apr - 03 May	Finnair
25 Apr - 02 May	Finnair

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 $752

Return flights