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

Return flights

25 Dec - 28 Dec	Air India
18 Dec - 22 Dec	Air India
04 Dec - 08 Dec	Thai Airways
26 Dec - 02 Jan	Thai Airways
25 Dec - 31 Dec	Thai Airways
05 Dec - 11 Dec	Thai AirAsia
02 Dec - 06 Dec	Air India
26 Dec - 02 Jan	Singapore Airlines	direct
18 Dec - 22 Dec	Singapore Airlines	direct
25 Dec - 31 Dec	Singapore Airlines	direct
25 Dec - 28 Dec	Singapore Airlines	direct
04 Dec - 08 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 379€

Return flights