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

Return flights

21 Sep - 08 Oct	Etihad Airways
13 Sep - 29 Sep	Pegasus Airlines
01 Sep - 10 Sep	China Southern
03 Sep - 15 Sep	Centrum Air
14 Sep - 18 Sep	Centrum Air
03 Sep - 14 Sep	Centrum Air
01 Sep - 11 Sep	Air Astana
01 Sep - 09 Sep	Air Astana
01 Sep - 13 Sep	Air Astana
01 Sep - 07 Sep	Air Astana
02 Sep - 09 Sep	Air Astana
21 Sep - 07 Oct	Air Astana
21 Sep - 07 Oct	Korean Air	direct
21 Sep - 08 Oct	Turkish Airlines	direct

Also check the deals for one-way flights from Istanbul to Seoul 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 Istanbul to Seoul in September from $647

Return flights