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

Return flights

18 Sep - 23 Sep	China Eastern
16 Sep - 23 Sep	China Eastern
04 Sep - 11 Sep	Air China
16 Sep - 22 Sep	China Eastern
04 Sep - 06 Sep	Air China
06 Sep - 13 Sep	MIAT Mongolian Airlines
07 Sep - 15 Sep	China Eastern
07 Sep - 14 Sep	China Eastern
02 Sep - 27 Sep	Etihad Airways
12 Sep - 21 Sep	China Eastern
04 Sep - 14 Oct	Air China
04 Sep - 16 Oct	Air China
22 Sep - 13 Oct	Aero K Airlines
22 Sep - 28 Oct	Emirates
22 Sep - 03 Oct	Emirates
06 Sep - 04 Oct	China Eastern
09 Sep - 01 Oct	Emirates
11 Sep - 16 Oct	Qatar Airways
03 Sep - 21 Oct	Air China
22 Sep - 27 Oct	Emirates

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 532€

Return flights