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

Return flights

27 Apr - 15 May	Air China
23 Apr - 07 May	Air China
21 Apr - 13 May	Air China
20 Apr - 26 May	Air China
27 Apr - 07 May	Air China
07 Apr - 11 May	Air China
19 Apr - 17 May	Air China
25 Apr - 07 May	Air China
21 Apr - 19 May	Air China
21 Apr - 18 May	Air China
12 Apr - 15 Apr	Air China
15 Apr - 22 Apr	Hainan Airlines
08 Apr - 22 Apr	Air India
21 Apr - 29 Apr	Air India
09 Apr - 19 Apr	Air India
21 Apr - 28 Apr	Air India
07 Apr - 19 Apr	Air India
13 Apr - 20 Apr	Hainan Airlines
08 Apr - 20 Apr	Hainan Airlines
06 Apr - 20 Apr	Hainan 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 $619

Return flights