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

Return flights

04 May - 18 May	Air China
16 May - 23 May	Air China
09 May - 17 May	Air China
08 May - 28 May	Air China
11 May - 15 May	Air China
04 May - 14 May	Air China
18 May - 29 May	Air China
18 May - 28 May	Air China
09 May - 21 May	Air China
04 May - 09 May	Air China
20 May - 03 Jun	Air China
21 May - 05 Jun	Air China
22 May - 06 Jun	Air China
16 May - 02 Jun	Air China
23 May - 03 Jun	Air China
29 May - 05 Jun	Air China
25 May - 08 Jun	Air China
17 May - 02 Jun	China Eastern

Also check the deals for one-way flights from London to Seoul 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 London to Seoul in May from 539€

Return flights