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

Return flights

09 Sep - 16 Sep	Air France
30 Sep - 12 Oct	LOT
07 Sep - 13 Sep	Air France
25 Sep - 04 Oct	Air France
25 Sep - 02 Oct	Air France
10 Sep - 19 Sep	LOT
17 Sep - 26 Sep	LOT
22 Sep - 30 Sep	Air France
14 Sep - 18 Sep	Air France
23 Sep - 28 Sep	Air France
21 Sep - 28 Sep	Air France
11 Sep - 18 Sep	Air France
14 Sep - 21 Sep	Air France
25 Sep - 11 Oct	Air France
30 Sep - 13 Oct	Air France

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 $1105

Return flights