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

Return flights

08 Sep - 15 Sep	IndiGo
06 Sep - 17 Sep	IndiGo
06 Sep - 18 Sep	IndiGo
07 Sep - 14 Sep	IndiGo
01 Sep - 10 Sep	IndiGo
05 Sep - 17 Sep	IndiGo
11 Sep - 12 Sep	IndiGo
18 Sep - 25 Sep	Thai AirAsia
09 Sep - 16 Sep	IndiGo
10 Sep - 14 Sep	Thai AirAsia
22 Sep - 09 Oct	HK Express
25 Sep - 12 Oct	HK Express
29 Sep - 31 Oct	HK Express
18 Sep - 13 Oct	Thai AirAsia
27 Sep - 01 Oct	HK Express
26 Sep - 01 Oct	Greater Bay Airlines
26 Sep - 06 Oct	Air India
30 Sep - 05 Oct	Cebu Pacific
24 Sep - 12 Oct	Hong Kong Airlines
27 Sep - 07 Oct	HK Express

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 289€

Return flights