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

Return flights

05 May - 18 May	Ryanair
11 May - 11 Jun	Ryanair
06 May - 14 May	Ryanair
11 May - 19 May	Ryanair
11 May - 18 May	Ryanair
11 May - 20 May	Ryanair
05 May - 11 May	Ryanair
06 May - 12 May	Ryanair
27 May - 09 Jun	Ryanair
07 May - 11 May	Ryanair
07 May - 18 May	Ryanair
12 May - 25 May	Ryanair
27 May - 17 Jun	Ryanair
29 May - 08 Jun	Ryanair
12 May - 10 Jun	Ryanair
27 May - 03 Jun	Ryanair
26 May - 21 Jun	Ryanair
27 May - 12 Jun	Ryanair
11 May - 01 Jun	Ryanair
07 May - 11 Jun	Ryanair

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 521€

Return flights