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

Return flights

19 Apr - 06 May	China Eastern
30 Apr - 04 May	China Eastern
20 Apr - 03 May	China Eastern
23 Apr - 07 May	China Eastern
21 Apr - 16 May	China Eastern
07 Apr - 11 May	China Eastern
07 Apr - 10 May	China Eastern
24 Apr - 10 May	China Eastern
23 Apr - 13 May	China Eastern
25 Apr - 10 May	China Eastern
14 Apr - 28 Apr	Air India
20 Apr - 26 Apr	Air India
23 Apr - 28 Apr	Air India
14 Apr - 21 Apr	Air India
21 Apr - 28 Apr	Air India
22 Apr - 28 Apr	Air India
13 Apr - 21 Apr	Air India
15 Apr - 29 Apr	Air India
15 Apr - 21 Apr	Air India
22 Apr - 29 Apr	Air India

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 403€

Return flights