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

Return flights

20 May - 31 May	Air China
24 May - 31 May	Air China
01 May - 25 May	Air China
16 May - 26 May	Air China
01 May - 17 May	Air China
01 May - 18 May	Air China
02 May - 12 May	Air China
07 May - 16 May	Air China
08 May - 18 May	Air China
22 May - 29 May	Air China
28 May - 11 Jun	Air China
01 May - 29 Jun	Air China
18 May - 01 Jun	Air China
27 May - 10 Jun	Scandinavian Airlines
28 May - 07 Jun	Lufthansa
18 May - 01 Jun	Korean Air	direct
28 May - 11 Jun	Korean Air	direct
27 May - 10 Jun	Korean Air	direct
01 May - 29 Jun	Asiana Airlines	direct
22 May - 07 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 $711

Return flights