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

Return flights

17 Dec - 31 Jan	Nepal Airlines
17 Dec - 18 Jan	Nepal Airlines
17 Dec - 14 Jan	Nepal Airlines
21 Dec - 20 Jan	Air India
17 Dec - 30 Jan	Nepal Airlines
21 Dec - 25 Jan	Air India
22 Dec - 25 Jan	Thai AirAsia
21 Dec - 23 Jan	Air India
26 Dec - 31 Jan	Air India
17 Dec - 15 Jan	Nepal Airlines
01 Dec - 31 Dec	Thai Lion Air
01 Dec - 08 Dec	Air India
05 Dec - 12 Dec	IndiGo
02 Dec - 09 Dec	Batik Air Malaysia
06 Dec - 13 Dec	Sichuan Airlines
20 Dec - 27 Dec	Air India Express
09 Dec - 16 Dec	Sichuan Airlines
19 Dec - 26 Dec	Nepal Airlines
04 Dec - 11 Dec	Air India
04 Dec - 05 Dec	Thai Airways

Also check the deals for one-way flights from Kathmandu to Sydney 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 Kathmandu to Sydney in December from $631

Return flights