AirHint found the following cheapest return flights from Seoul (GMP) to London (LGW) in September 2026 (see full year).

Return flights

11 Sep - 21 Sep	Air China
11 Sep - 14 Sep	Air China
14 Sep - 21 Sep	Air China
06 Sep - 12 Sep	Air China
09 Sep - 16 Sep	Air China
12 Sep - 19 Sep	Air China
07 Sep - 14 Sep	Air China
01 Sep - 07 Sep	Air China
13 Sep - 17 Sep	Air China
16 Sep - 23 Sep	Air China
26 Sep - 03 Oct	Air China
28 Sep - 05 Oct	Air China
23 Sep - 10 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 $785

Return flights