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

Return flights

26 May - 02 Jun	Air China
07 May - 12 May	Air China
30 May - 08 Jun	Air China
12 May - 27 May	Air China
13 May - 27 May	Air China
03 May - 17 May	Air China
10 May - 17 May	Air China
07 May - 25 May	Air China
19 May - 26 May	Air China
21 May - 28 May	Air China
11 May - 29 May	Air China
07 May - 16 May	Air China
10 May - 02 Jun	Air China
05 May - 07 Jun	Air China
27 May - 01 Jun	Air China
16 May - 03 Jun	SWISS
16 May - 01 Jun	China Southern
16 May - 02 Jun	China Southern
28 May - 07 Jun	China Southern
26 May - 11 Jun	China Southern

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 $635

Return flights