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

Return flights

02 Apr - 12 Apr	Air China
01 Apr - 08 Apr	Air China
03 Apr - 13 Apr	Air China
03 Apr - 07 Apr	Air China
20 Apr - 07 May	Air China
02 Apr - 11 Apr	Air China
02 Apr - 08 Apr	Air China
22 Apr - 24 Apr	Air China
24 Apr - 04 May	Air China
01 Apr - 06 Apr	Air China
02 Apr - 07 Apr	Air China
01 Apr - 14 Apr	Air China
27 Apr - 11 May	Air China
13 Apr - 01 May	Air China
28 Apr - 05 May	Air China
17 Apr - 03 May	Air China
08 Apr - 12 May	Air China
28 Apr - 04 May	Air China
28 Apr - 08 May	Air China
25 Apr - 04 May	Shenzhen Airlines

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

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Seoul to London in April from 467€

Return flights