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

Return flights

17 Sep - 12 Oct	VietJet Air
02 Sep - 09 Sep	China Southern
10 Sep - 19 Sep	Air India
01 Sep - 12 Sep	Cathay Pacific
12 Sep - 18 Sep	Cathay Pacific
09 Sep - 16 Sep	Cathay Pacific
12 Sep - 14 Sep	Cathay Pacific
06 Sep - 09 Sep	Cathay Pacific
09 Sep - 12 Sep	Cathay Pacific
01 Sep - 15 Sep	Cathay Pacific
08 Sep - 16 Sep	Cathay Pacific
07 Sep - 06 Oct	Cathay Pacific
09 Sep - 05 Oct	Cathay Pacific
13 Sep - 11 Oct	Air India
17 Sep - 17 Oct	Air India
09 Sep - 04 Oct	Air India
05 Sep - 15 Oct	Air India
17 Sep - 10 Oct	Air India
18 Sep - 11 Oct	Air India
18 Sep - 12 Oct	Air India

Also check the deals for one-way flights from Tokyo 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 Tokyo to Kathmandu in September from $605

Return flights