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

Return flights

01 Sep - 18 Sep	IndiGo
04 Sep - 24 Sep	IndiGo
09 Sep - 23 Sep	IndiGo
08 Sep - 16 Sep	IndiGo
14 Sep - 21 Sep	IndiGo
21 Sep - 26 Sep	Air China
23 Sep - 27 Sep	Air India
27 Sep - 25 Oct	Air India
26 Sep - 30 Oct	Air India
10 Sep - 18 Sep	Air India
01 Sep - 18 Sep	Cathay Pacific	direct
10 Sep - 18 Sep	Cathay Pacific	direct
23 Sep - 28 Oct	Air India
20 Sep - 05 Oct	IndiGo
28 Sep - 09 Oct	IndiGo
26 Sep - 20 Oct	Thai Airways
25 Sep - 25 Oct	Air India
29 Sep - 29 Oct	IndiGo
27 Sep - 30 Oct	Thai Airways
26 Sep - 20 Oct	Cathay Pacific	direct

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 $483

Return flights