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

Return flights

11 Apr - 08 May	Air China
16 Apr - 25 Apr	Air China
28 Apr - 06 May	Air China
27 Apr - 04 May	Air China
08 Apr - 09 May	Air China
15 Apr - 29 Apr	Air China
07 Apr - 13 Apr	Lufthansa
23 Apr - 27 Apr	Air China
23 Apr - 30 Apr	Air China
13 Apr - 30 Apr	Air China
16 Apr - 27 Apr	Air China
29 Apr - 09 May	Air China
09 Apr - 08 May	Air China
23 Apr - 10 May	Air China
10 Apr - 01 May	Air China
22 Apr - 29 Apr	Air China
11 Apr - 28 Apr	Air China
18 Apr - 04 May	Air China
11 Apr - 30 May	Air China
06 Apr - 13 Apr	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 $641

Return flights