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

Return flights

01 Sep - 01 Oct	China Eastern
08 Sep - 12 Sep	China Eastern
18 Sep - 23 Sep	Thai AirAsia
01 Sep - 28 Sep	IndiGo
12 Sep - 18 Sep	IndiGo
10 Sep - 24 Sep	IndiGo
17 Sep - 22 Sep	IndiGo
27 Sep - 30 Sep	HK Express
20 Sep - 27 Sep	Hong Kong Airlines
19 Sep - 14 Oct	Thai Airways
01 Sep - 28 Sep	Cathay Pacific	direct
12 Sep - 18 Sep	Cathay Pacific	direct
30 Sep - 07 Oct	Air India
26 Sep - 08 Oct	IndiGo
26 Sep - 03 Oct	IndiGo
26 Sep - 24 Oct	IndiGo
28 Sep - 08 Oct	IndiGo
20 Sep - 14 Oct	Thai Airways
29 Sep - 07 Oct	IndiGo
26 Sep - 27 Oct	IndiGo

Also check the deals for one-way flights from Hong Kong 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 Hong Kong to Kathmandu in September from 266€

Return flights