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

Return flights

23 Dec - 01 Jan	Cathay Pacific
20 Dec - 12 Jan	Thai Airways
20 Dec - 10 Jan	Thai Airways
27 Dec - 16 Jan	Thai Airways
21 Dec - 06 Jan	Thai Airways
12 Dec - 13 Jan	Thai Airways
31 Dec - 04 Jan	SriLankan Airlines
07 Dec - 22 Dec	Thai AirAsia
19 Dec - 05 Jan	Cathay Pacific
13 Dec - 21 Dec	Thai AirAsia
16 Dec - 20 Dec	Thai Airways
19 Dec - 02 Jan	Thai Airways
13 Dec - 20 Dec	Thai Airways
22 Dec - 27 Dec	Thai Airways
18 Dec - 30 Dec	Thai Airways
04 Dec - 26 Dec	Thai Airways
07 Dec - 27 Dec	Thai Airways
12 Dec - 03 Jan	Thai Airways
07 Dec - 23 Dec	Thai Airways
10 Dec - 10 Dec	Air India Express

Also check the deals for one-way flights from Singapore 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 Singapore to Kathmandu in December from 412€

Return flights