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

Return flights

10 Apr - 25 Apr	Air China
24 Apr - 29 Apr	Air China
20 Apr - 30 Apr	Air China
21 Apr - 27 Apr	Air China
21 Apr - 29 Apr	Air China
10 Apr - 28 Apr	Air China
15 Apr - 29 Apr	Air China
10 Apr - 09 May	Air China
24 Apr - 05 May	Air China
29 Apr - 13 May	Air China
19 Apr - 02 May	Air China
10 Apr - 10 May	Air China
25 Apr - 04 May	Air China
10 Apr - 01 May	Air China
06 Apr - 18 May	Air China
08 Apr - 08 May	Air China
08 Apr - 09 May	Air China
18 Apr - 26 Apr	Air China
18 Apr - 25 Apr	Air China
13 Apr - 26 Apr	Air China

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 575€

Return flights