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

One-Way flights

11 Sep	China Eastern
13 Sep	China Eastern
01 Sep	China Eastern
04 Sep	China Eastern
09 Sep	China Eastern
06 Sep	China Eastern
02 Sep	China Eastern
16 Sep	China Eastern
10 Sep	China Eastern
20 Sep	China Eastern

Also check the deals for return 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 one-way flights from Seoul to Istanbul in September from $224

One-Way flights