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

Return flights

16 Dec - 04 Jan	Thai AirAsia
20 Dec - 03 Jan	Thai Airways
28 Dec - 04 Jan	Thai AirAsia
26 Dec - 30 Dec	Air India
20 Dec - 04 Jan	Air India
21 Dec - 04 Jan	Air India
19 Dec - 03 Jan	Air India
01 Dec - 14 Dec	Air India
23 Dec - 04 Jan	Thai AirAsia
16 Dec - 26 Dec	Thai AirAsia
23 Dec - 26 Dec	Thai AirAsia
21 Dec - 26 Dec	Thai AirAsia
20 Dec - 26 Dec	Thai AirAsia
20 Dec - 03 Jan	Singapore Airlines	direct
20 Dec - 04 Jan	Singapore Airlines	direct
19 Dec - 03 Jan	Singapore Airlines	direct
26 Dec - 30 Dec	Singapore Airlines	direct
01 Dec - 14 Dec	Singapore Airlines	direct

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 436€

Return flights