AirHint found the following cheapest return flights from Seoul (GMP) to London (LHR) in September 2025 (see full year).

Return flights

07 Sep - 14 Sep	China Southern
06 Sep - 14 Sep	China Southern
04 Sep - 17 Sep	China Southern
09 Sep - 20 Sep	Air China
06 Sep - 09 Sep	Air China
09 Sep - 15 Sep	Air China
09 Sep - 21 Sep	Air China
12 Sep - 22 Sep	Air China
09 Sep - 16 Sep	Air China
02 Sep - 22 Sep	Air China
01 Sep - 01 Oct	Air China
16 Sep - 22 Oct	Air China
21 Sep - 25 Oct	Air China
15 Sep - 22 Oct	Air China
24 Sep - 02 Oct	Air China
19 Sep - 02 Oct	Air China
25 Sep - 02 Oct	Air China
17 Sep - 23 Oct	Air China
11 Sep - 15 Oct	Air China
25 Sep - 01 Oct	Air China

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

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 September from 572€

Return flights