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

Return flights

05 Sep - 13 Sep	China Southern
05 Sep - 10 Sep	China Southern
03 Sep - 10 Sep	China Southern
02 Sep - 09 Sep	China Southern
05 Sep - 15 Sep	China Southern
23 Sep - 30 Sep	China Eastern
03 Sep - 03 Oct	Air India
01 Sep - 13 Sep	HK Express
06 Sep - 16 Sep	AirAsia X
23 Sep - 29 Oct	China Eastern
17 Sep - 27 Sep	AirAsia X
22 Sep - 29 Sep	AirAsia X
10 Sep - 03 Oct	Air India
11 Sep - 04 Oct	Air India
25 Sep - 02 Oct	Hainan Airlines
28 Sep - 20 Oct	HK Express
17 Sep - 03 Oct	Air India
14 Sep - 12 Oct	Air India
05 Sep - 05 Oct	Thai Airways
01 Sep - 12 Oct	Thai Airways

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 $554

Return flights