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

Return flights

05 Sep - 13 Sep	Thai Lion Air
18 Sep - 27 Sep	Thai Lion Air
11 Sep - 20 Sep	Thai Lion Air
24 Sep - 30 Sep	Thai VietJet Air
01 Sep - 11 Sep	Thai AirAsia
25 Sep - 02 Oct	Thai Lion Air
03 Sep - 10 Sep	Thai Lion Air
14 Sep - 19 Sep	Thai Lion Air
27 Sep - 10 Oct	HK Express
27 Sep - 26 Oct	Thai Lion Air
26 Sep - 10 Oct	Thai VietJet Air
03 Sep - 15 Sep	AirAsia X
08 Sep - 26 Sep	AirAsia X
20 Sep - 21 Sep	Thai VietJet Air
28 Sep - 09 Oct	AirAsia X
26 Sep - 13 Oct	AirAsia X
27 Sep - 04 Oct	AirAsia X
26 Sep - 07 Oct	Thai Lion Air
25 Sep - 12 Oct	AirAsia X
27 Sep - 09 Oct	AirAsia X

Also check the deals for one-way flights from Taipei 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 Taipei to Kathmandu in September from $418

Return flights