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

Return flights

30 Sep - 30 Oct	Thai AirAsia X
25 Sep - 02 Oct	VietJet Air
25 Sep - 08 Oct	VietJet Air
23 Sep - 06 Oct	VietJet Air
28 Sep - 11 Oct	VietJet Air
25 Sep - 06 Oct	VietJet Air
30 Sep - 06 Oct	VietJet Air
30 Sep - 13 Oct	VietJet Air
28 Sep - 04 Oct	VietJet Air
24 Sep - 06 Oct	VietJet Air
27 Sep - 28 Sep	VietJet Air
21 Sep - 24 Sep	Thai Airways
22 Sep - 26 Sep	Thai Airways
24 Sep - 29 Sep	IndiGo
22 Sep - 24 Sep	IndiGo
23 Sep - 28 Sep	IndiGo
27 Sep - 30 Sep	IndiGo
24 Sep - 28 Sep	IndiGo
24 Sep - 26 Sep	IndiGo
26 Sep - 30 Sep	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 522€

Return flights