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

Return flights

22 Apr - 08 May	Ryanair
30 Apr - 11 May	Ryanair
15 Apr - 27 Apr	Turkish Airlines
23 Apr - 25 May	Ryanair
23 Apr - 04 May	Ryanair
20 Apr - 11 May	Ryanair
27 Apr - 11 May	Ryanair
28 Apr - 12 May	Turkish Airlines
27 Apr - 08 May	Ryanair
07 Apr - 17 Apr	Ryanair
14 Apr - 02 May	Turkish Airlines
28 Apr - 09 May	Turkish Airlines
13 Apr - 20 Apr	Ryanair
16 Apr - 27 Apr	Ryanair
06 Apr - 22 Apr	Ryanair
16 Apr - 29 Apr	Ryanair
14 Apr - 24 Apr	Ryanair
14 Apr - 30 Apr	Ryanair
11 Apr - 29 Apr	Ryanair
01 Apr - 08 Apr	Ryanair

Also check the deals for one-way flights from London to Seoul in April.

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 April from $739

Return flights