AirHint found the following cheapest return flights from Sydney (SYD) to Kathmandu (KTM) in December 2025 (see full year).

Return flights

01 Dec - 24 Dec	Scoot
01 Dec - 18 Dec	Scoot
01 Dec - 25 Dec	Malaysia Airlines
03 Dec - 16 Dec	Cathay Pacific
04 Dec - 23 Dec	Cathay Pacific
01 Dec - 15 Dec	Qantas
01 Dec - 19 Dec	Qantas
05 Dec - 21 Dec	Cathay Pacific
07 Dec - 23 Dec	China Southern
01 Dec - 16 Dec	Thai Airways
03 Dec - 20 Jan	Singapore Airlines
29 Dec - 05 Jan	Sichuan Airlines
04 Dec - 01 Jan	Thai Airways
03 Dec - 01 Jan	Thai Airways
06 Dec - 01 Jan	Thai Airways
05 Dec - 01 Jan	Thai Airways
31 Dec - 06 Jan	China Southern
16 Dec - 11 Jan	AirAsia X
17 Dec - 12 Jan	Batik Air Malaysia
17 Dec - 13 Jan	Hainan Airlines

Also check the deals for one-way flights from Sydney to Kathmandu in December.

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 Sydney to Kathmandu in December from $759

Return flights