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

Return flights

01 May - 08 May	Air China
22 May - 31 May	Air China
04 May - 23 May	Air China
04 May - 31 May	Air China
22 May - 30 May	Air China
02 May - 18 May	Air China
01 May - 15 May	Air China
21 May - 01 Jun	Air China
23 May - 06 Jun	Air China
04 May - 25 May	Air China
11 May - 27 May	Air China
04 May - 19 May	Air China
25 May - 04 Jun	Air China
26 May - 04 Jun	Air China
18 May - 01 Jun	Air China
27 May - 06 Jun	LOT
22 May - 05 Jun	Scandinavian Airlines
22 May - 06 Jun	Korean Air	direct
21 May - 01 Jun	Korean Air	direct
26 May - 04 Jun	Korean Air	direct

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 $660

Return flights