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

Return flights

18 May - 25 May	China Southern
13 May - 17 May	China Southern
11 May - 28 May	China Southern
22 May - 30 May	China Southern
23 May - 30 May	China Southern
14 May - 19 May	China Southern
08 May - 12 May	Air China
12 May - 19 May	Air China
07 May - 12 May	Air China
17 May - 24 May	Air China
22 May - 09 Jun	Air China
21 May - 03 Jun	Air China
25 May - 19 Jun	Air China
27 May - 03 Jun	Air China
20 May - 03 Jun	Air China
27 May - 02 Jun	Air China
24 May - 02 Jun	Air China
22 May - 04 Jun	Air China
31 May - 04 Jun	Air China
28 May - 07 Jun	Air China

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 515€

Return flights