AirHint found the following cheapest return flights from Ljubljana (LJU) to New York (JFK) in September 2025 (see full year).

Return flights

16 Sep - 20 Sep	Air Serbia
16 Sep - 22 Sep	Air Serbia
16 Sep - 21 Sep	Air Serbia
15 Sep - 20 Sep	Air Serbia
15 Sep - 22 Sep	Air Serbia
29 Sep - 04 Oct	Air Serbia
02 Sep - 08 Sep	Transavia France
04 Sep - 11 Sep	Air Serbia
14 Sep - 18 Sep	LOT
14 Sep - 19 Sep	LOT
14 Sep - 20 Sep	LOT
25 Sep - 09 Oct	LOT
21 Sep - 05 Oct	KLM
29 Sep - 08 Oct	SWISS
27 Sep - 04 Oct	Brussels Airlines

Also check the deals for one-way flights from Ljubljana to New York 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 Ljubljana to New York in September from $578

Return flights