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

Return flights

20 May - 31 May	Air China
25 May - 02 Jun	Air China
30 May - 07 Jun	Air China
13 May - 20 May	Air China
17 May - 23 May	China Southern
30 May - 08 Jun	China Southern
29 May - 08 Jun	China Southern
11 May - 19 May	China Southern
26 May - 29 May	Air China
15 May - 21 May	Air China
23 May - 29 May	Air China
31 May - 18 Jun	Air China
13 May - 18 May	Air China
18 May - 24 May	Air China
15 May - 05 Jun	Air China
15 May - 19 May	Air China
27 May - 04 Jun	ANA

Also check the deals for one-way flights from Seoul to London in May.

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 May from 554€

Return flights