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

Return flights

15 Sep - 22 Sep	Transavia France	direct
26 Sep - 03 Oct	Transavia France	direct
08 Sep - 29 Sep	Transavia France	direct
19 Sep - 22 Sep	Ryanair
15 Sep - 19 Sep	Transavia France	direct
26 Sep - 29 Sep	Ryanair
24 Sep - 26 Sep	Transavia France
13 Sep - 17 Sep	Ryanair
03 Sep - 24 Sep	Transavia France	direct
02 Sep - 09 Sep	Transavia France
02 Sep - 08 Sep	Transavia France

Also check the deals for one-way flights from Nantes 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 Nantes to Istanbul in September from $175

Return flights