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

Return flights

06 Sep - 13 Sep	Air China
07 Sep - 14 Sep	Air China
11 Sep - 13 Sep	Air China
10 Sep - 22 Sep	Air China
11 Sep - 20 Sep	Air China
04 Sep - 06 Sep	Air China
04 Sep - 08 Sep	Air China
01 Sep - 06 Sep	Air China
01 Sep - 11 Sep	Air China
08 Sep - 15 Sep	Air China
30 Sep - 07 Oct	EVA Air
25 Sep - 05 Oct	EVA Air
26 Sep - 01 Oct	EVA Air
11 Sep - 10 Oct	Air China
10 Sep - 10 Oct	Air China
27 Sep - 04 Oct	Air China
29 Sep - 09 Oct	Air China
19 Sep - 11 Oct	EVA Air
27 Sep - 09 Oct	Air China
26 Sep - 10 Oct	ANA

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.

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Cheapest return flights from Seoul to London in September from 769€

Return flights