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

Return flights

27 Sep - 12 Oct	Air China
19 Sep - 26 Sep	Air China
22 Sep - 15 Oct	Air China
17 Sep - 03 Oct	Air China
15 Sep - 24 Oct	China Eastern
16 Sep - 05 Oct	Air China
22 Sep - 07 Oct	Air China
17 Sep - 28 Oct	China Eastern
15 Sep - 28 Sep	China Eastern
19 Sep - 31 Oct	Air China
15 Sep - 21 Sep	Thai AirAsia X
15 Sep - 22 Sep	China Eastern
15 Sep - 23 Sep	China Eastern
29 Sep - 31 Oct	VietJet Air
15 Sep - 26 Oct	China Eastern
15 Sep - 26 Sep	Tigerair Taiwan
15 Sep - 20 Sep	Thai Airways
15 Sep - 17 Sep	Thai Airways
15 Sep - 21 Sep	Nepal Airlines	direct
15 Sep - 23 Sep	Nepal Airlines	direct

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 $533

Return flights