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

Return flights

23 Sep - 07 Oct	Air Canada
09 Sep - 21 Sep	Air Canada
05 Sep - 14 Sep	Air Canada
01 Sep - 14 Sep	Air Canada
10 Sep - 14 Sep	Air Canada
01 Sep - 01 Oct	Delta
01 Sep - 08 Sep	Delta
02 Sep - 09 Sep	Delta
12 Sep - 18 Sep	Delta
03 Sep - 01 Oct	Delta
06 Sep - 17 Sep	Delta
07 Sep - 15 Sep	Delta
09 Sep - 15 Sep	Delta
29 Sep - 07 Oct	Spirit Airlines
29 Sep - 10 Oct	Delta
27 Sep - 05 Oct	Delta
24 Sep - 02 Oct	United

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 534€

Return flights