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

Return flights

19 Apr - 05 May	Air China
10 Apr - 19 Apr	Air China
07 Apr - 21 Apr	Air China
22 Apr - 20 May	Air China
21 Apr - 05 May	Air China
10 Apr - 25 Apr	Air China
10 Apr - 24 Apr	Air China
17 Apr - 28 Apr	Air China
22 Apr - 04 May	Air China
05 Apr - 21 Apr	Air China
17 Apr - 25 Apr	Air China
08 Apr - 22 Apr	Air China
12 Apr - 21 Apr	Air China
29 Apr - 13 May	Air China
13 Apr - 19 Apr	Lufthansa
20 Apr - 13 May	Japan Airlines
20 Apr - 06 May	EVA Air
26 Apr - 24 May	ANA
24 Apr - 03 May	ANA
30 Apr - 07 May	ANA

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 $868

Return flights