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

Return flights

03 Apr - 20 Apr	China Southern
02 Apr - 11 Apr	China Southern
01 Apr - 14 Apr	Air China
01 Apr - 12 Apr	Air China
03 Apr - 07 Apr	Air China
01 Apr - 07 Apr	Air China
08 Apr - 15 Apr	Air China
22 Apr - 26 Apr	Air China
01 Apr - 05 Apr	Air China
22 Apr - 25 Apr	Air China
24 Apr - 01 May	Air China
28 Apr - 08 May	China Southern
24 Apr - 03 May	Air China
30 Apr - 05 May	Air China
29 Apr - 05 May	Air China
20 Apr - 04 May	China Southern
30 Apr - 07 May	Japan Airlines
30 Apr - 09 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 558€

Return flights