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

Return flights

11 Sep - 18 Sep	China Eastern
13 Sep - 17 Sep	China Eastern
09 Sep - 25 Sep	China Eastern
04 Sep - 25 Sep	China Eastern
02 Sep - 09 Sep	China Eastern
04 Sep - 18 Sep	China Eastern
04 Sep - 16 Sep	China Eastern
10 Sep - 17 Sep	China Eastern
17 Sep - 24 Sep	China Eastern
09 Sep - 13 Sep	China Eastern
11 Sep - 02 Oct	MIAT Mongolian Airlines
18 Sep - 31 Oct	China Eastern
15 Sep - 30 Oct	Emirates
24 Sep - 02 Oct	Emirates
15 Sep - 02 Oct	Emirates
14 Sep - 02 Oct	Emirates
17 Sep - 01 Oct	Emirates
24 Sep - 01 Oct	Emirates
22 Sep - 01 Oct	Emirates
25 Sep - 02 Oct	Etihad Airways

Also check the deals for one-way flights from Seoul to Istanbul 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 Istanbul in September from 345€

Return flights