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

Return flights

14 Oct - 08 Nov	China Southern
23 Oct - 27 Oct	Air China
29 Oct - 12 Nov	Air China
13 Oct - 04 Nov	Air China
16 Oct - 27 Oct	Air China
15 Oct - 12 Nov	Air China
13 Oct - 29 Oct	Air China
15 Oct - 28 Oct	Air China
24 Oct - 29 Oct	Air China
23 Oct - 29 Oct	Air China
23 Oct - 28 Oct	Air China
19 Oct - 30 Oct	Air China
18 Oct - 22 Oct	Air China
18 Oct - 30 Oct	Air China
28 Oct - 14 Nov	Air China
30 Oct - 08 Nov	Air China
27 Oct - 03 Nov	Air China
27 Oct - 08 Nov	Air China
29 Oct - 08 Nov	Air China
22 Oct - 07 Nov	Air China

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

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 October from $624

Return flights