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

Return flights

02 Sep - 06 Sep	China Eastern
10 Sep - 24 Sep	Korean Air
10 Sep - 17 Sep	Asiana Airlines
12 Sep - 19 Sep	Asiana Airlines
05 Sep - 13 Sep	Asiana Airlines
13 Sep - 19 Sep	Asiana Airlines
13 Sep - 20 Sep	Korean Air

Also check the deals for one-way flights from Cheju 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 Cheju to Istanbul in September from $533

Return flights