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

Return flights

27 Dec - 15 Jan	SriLankan Airlines
27 Dec - 19 Jan	SriLankan Airlines
16 Dec - 04 Jan	SriLankan Airlines
20 Dec - 04 Jan	AirAsia
14 Dec - 04 Jan	Thai AirAsia
28 Dec - 18 Jan	Thai AirAsia
01 Dec - 13 Dec	Thai Airways
26 Dec - 18 Jan	Thai Airways
27 Dec - 17 Jan	Thai Airways
25 Dec - 15 Jan	Thai Airways
14 Dec - 24 Dec	Thai Airways
20 Dec - 03 Jan	Thai Airways
13 Dec - 27 Dec	Air India
15 Dec - 22 Dec	Air India
26 Dec - 30 Dec	Air India
01 Dec - 14 Dec	Air India
16 Dec - 21 Dec	Thai AirAsia
14 Dec - 21 Dec	Thai AirAsia
16 Dec - 22 Dec	Thai AirAsia
14 Dec - 22 Dec	Thai AirAsia

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 $421

Return flights