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

Return flights

10 Sep - 17 Sep	Air Canada
14 Sep - 18 Sep	Air Canada
27 Sep - 06 Oct	Air Canada
10 Sep - 24 Sep	Delta
10 Sep - 16 Sep	Delta
11 Sep - 18 Sep	Delta
23 Sep - 21 Oct	Air Canada
09 Sep - 17 Sep	Delta
09 Sep - 18 Sep	Delta
16 Sep - 20 Sep	Air Canada
08 Sep - 04 Oct	British Airways
22 Sep - 26 Sep	Air Canada
11 Sep - 27 Sep	Air Canada
30 Sep - 08 Oct	British Airways
09 Sep - 04 Oct	Lufthansa
19 Sep - 06 Oct	Air Canada
29 Sep - 10 Oct	Air Canada
23 Sep - 08 Oct	Spirit Airlines
26 Sep - 04 Oct	Delta
27 Sep - 18 Oct	Frontier Airlines

Also check the deals for one-way flights from New York 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 New York to Istanbul in September from 538€

Return flights