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

Return flights

01 Sep - 17 Sep	Cathay Pacific
08 Sep - 28 Sep	Air India
08 Sep - 08 Oct	Air India
05 Sep - 30 Sep	Etihad Airways
09 Sep - 08 Oct	Air India
15 Sep - 30 Sep	Air India
16 Sep - 26 Sep	Etihad Airways
21 Sep - 05 Oct	Air India
17 Sep - 26 Sep	Etihad Airways
21 Sep - 10 Oct	Air India
20 Sep - 11 Oct	Air India
29 Sep - 24 Oct	Etihad Airways
01 Sep - 29 Oct	Air India
18 Sep - 04 Oct	Air India
19 Sep - 04 Oct	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 662€

Return flights