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

Return flights

19 Sep - 26 Sep	Virgin Atlantic
24 Sep - 12 Oct	Etihad Airways
25 Sep - 03 Oct	Etihad Airways
26 Sep - 04 Oct	Kuwait Airways
22 Sep - 15 Oct	Turkish Airlines
25 Sep - 12 Oct	Etihad Airways
22 Sep - 29 Sep	Air India
29 Sep - 13 Oct	Norse Atlantic Airways
29 Sep - 20 Oct	Norse Atlantic Airways
26 Sep - 26 Oct	Kuwait Airways
23 Sep - 30 Sep	IndiGo
21 Sep - 28 Sep	Etihad Airways
28 Sep - 26 Oct	Etihad Airways
30 Sep - 11 Oct	Etihad Airways
22 Sep - 27 Sep	IndiGo

Also check the deals for one-way flights from New York to Kathmandu 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 Kathmandu in September from $908

Return flights