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

Return flights

19 Sep - 24 Sep	Turkish Airlines
12 Sep - 17 Sep	Turkish Airlines	direct
05 Sep - 07 Sep	Turkish Airlines	direct
07 Sep - 10 Sep	Turkish Airlines	direct
10 Sep - 14 Sep	Turkish Airlines	direct
05 Sep - 05 Sep	Turkish Airlines
04 Sep - 07 Sep	Wizz Air UK
04 Sep - 06 Sep	Wizz Air UK
04 Sep - 05 Sep	Wizz Air UK

Also check the deals for one-way flights from Constanta 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 Constanta to Istanbul in September from 157€

Return flights