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

Return flights

07 Sep - 23 Sep	Qantas
01 Sep - 08 Sep	China Southern
30 Sep - 30 Oct	Qantas
12 Sep - 18 Sep	China Southern
01 Sep - 10 Oct	Qantas
24 Sep - 26 Oct	IndiGo
20 Sep - 30 Sep	Singapore Airlines
28 Sep - 07 Oct	Qantas
29 Sep - 07 Oct	Singapore Airlines
29 Sep - 08 Oct	Singapore Airlines
29 Sep - 09 Oct	Singapore Airlines
18 Sep - 28 Oct	Korean Air
21 Sep - 03 Oct	IndiGo
11 Sep - 13 Oct	Qantas
19 Sep - 30 Sep	Qantas

Also check the deals for one-way flights from Brisbane 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 Brisbane to Kathmandu in September from $742

Return flights