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

Return flights

12 Dec - 05 Jan	Thai AirAsia
21 Dec - 05 Jan	Malaysia Airlines
04 Dec - 07 Dec	Malaysia Airlines
01 Dec - 03 Dec	Thai Airways
01 Dec - 12 Dec	Thai Airways
21 Dec - 05 Jan	Singapore Airlines	direct
12 Dec - 05 Jan	Singapore Airlines	direct
04 Dec - 07 Dec	Singapore Airlines	direct
01 Dec - 12 Dec	Singapore Airlines	direct
01 Dec - 03 Dec	Singapore Airlines	direct

Also check the deals for one-way flights from Kathmandu to Singapore 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 Singapore in December from 290€

Return flights