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

Return flights

08 Sep - 15 Sep	Air China
07 Sep - 18 Sep	Air China
07 Sep - 16 Sep	Air China
01 Sep - 10 Sep	Air China
27 Sep - 04 Oct	Air China
25 Sep - 07 Oct	EVA Air
17 Sep - 24 Sep	China Southern
19 Sep - 27 Sep	EVA Air
18 Sep - 27 Sep	EVA Air
18 Sep - 28 Sep	ANA
21 Sep - 27 Sep	ANA
30 Sep - 10 Oct	ANA
17 Sep - 25 Sep	China Southern
21 Sep - 04 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 698€

Return flights