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

Return flights

16 Apr - 30 Apr	Air China
15 Apr - 30 Apr	Air China
20 Apr - 27 Apr	Air China
19 Apr - 30 Apr	Air China
13 Apr - 27 Apr	Air China
20 Apr - 28 Apr	Air China
23 Apr - 08 May	Air China
27 Apr - 13 May	Air China
11 Apr - 09 May	Air China
13 Apr - 01 May	Air China
22 Apr - 29 Apr	Air China
21 Apr - 28 Apr	Air China
23 Apr - 15 May	Scandinavian Airlines
23 Apr - 02 May	Scandinavian Airlines
15 Apr - 22 Apr	Lufthansa
14 Apr - 29 Apr	Air China
27 Apr - 08 May	Air China
28 Apr - 09 May	Ryanair
22 Apr - 24 May	Air China
23 Apr - 04 May	Scandinavian Airlines

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 $665

Return flights