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

Return flights

08 Sep - 23 Sep	Cathay Pacific
01 Sep - 08 Sep	Cathay Pacific
06 Sep - 12 Sep	Cathay Pacific
08 Sep - 18 Sep	Air India
02 Sep - 07 Oct	Etihad Airways
12 Sep - 03 Oct	Etihad Airways
09 Sep - 14 Oct	Etihad Airways
23 Sep - 08 Oct	Air India
22 Sep - 12 Oct	Etihad Airways
25 Sep - 28 Sep	Air India
28 Sep - 05 Oct	Philippine Airlines
27 Sep - 13 Oct	Etihad Airways
27 Sep - 06 Oct	Etihad Airways
28 Sep - 26 Oct	Philippine Airlines
29 Sep - 28 Oct	Etihad Airways

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 661€

Return flights