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

Return flights

07 Sep - 11 Sep	Air China
09 Sep - 12 Sep	Air China
16 Sep - 23 Sep	Air China
14 Sep - 21 Sep	Air China
07 Sep - 16 Sep	Air China
16 Sep - 22 Sep	Air China
09 Sep - 16 Sep	Emirates
29 Sep - 06 Oct	Emirates
15 Sep - 22 Sep	Emirates
02 Sep - 03 Oct	Air China
12 Sep - 18 Sep	Air China
05 Sep - 11 Sep	Air China
11 Sep - 16 Oct	Qatar Airways
30 Sep - 04 Oct	Air China
24 Sep - 08 Oct	Singapore Airlines
25 Sep - 05 Oct	Singapore Airlines
23 Sep - 03 Oct	Air China
25 Sep - 09 Oct	Singapore Airlines
23 Sep - 04 Oct	Singapore Airlines
24 Sep - 04 Oct	Singapore Airlines

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 $711

Return flights