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

Return flights

13 Sep - 21 Sep	Air China
12 Sep - 19 Sep	Air China
13 Sep - 29 Oct	Air China
11 Sep - 15 Sep	Air China
08 Sep - 15 Sep	Air China
03 Sep - 05 Sep	Air China
08 Sep - 13 Sep	Air China
11 Sep - 14 Sep	Air China
09 Sep - 16 Sep	Air China
10 Sep - 14 Sep	Air China
12 Sep - 16 Sep	Air China
08 Sep - 29 Oct	Air China
06 Sep - 10 Oct	Air China
15 Sep - 10 Oct	Air China
12 Sep - 28 Oct	Air China
16 Sep - 30 Oct	Air China
10 Sep - 31 Oct	Air China
15 Sep - 30 Oct	Air China
16 Sep - 31 Oct	Air China
24 Sep - 29 Oct	VietJet Air

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.

Book a cheap hotel in Kathmandu

Cheap car rent in Kathmandu

Cheapest return flights from Tokyo to Kathmandu in September from $488

Return flights