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

Return flights

25 Apr - 28 Apr	Air China
25 Apr - 29 Apr	Air China
03 Apr - 10 Apr	Air China
30 Apr - 06 May	Air China
30 Apr - 08 May	Air China
12 Apr - 17 Apr	Air China
25 Apr - 09 May	Air China
17 Apr - 24 Apr	Air China
11 Apr - 18 Apr	Air China
20 Apr - 27 Apr	Air China
14 Apr - 21 Apr	Air China
29 Apr - 06 May	Air China
22 Apr - 26 Apr	Air China
22 Apr - 25 Apr	Air China
30 Apr - 05 May	Air China
29 Apr - 04 May	EVA Air
30 Apr - 07 May	Japan Airlines

Also check the deals for one-way flights from Seoul to London 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 Seoul to London in April from 764€

Return flights