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

Return flights

10 Dec - 09 Jan	IndiGo
15 Dec - 21 Dec	Air India
14 Dec - 22 Dec	Nepal Airlines
30 Dec - 02 Jan	Malaysia Airlines
15 Dec - 22 Dec	Air India
12 Dec - 20 Dec	IndiGo
08 Dec - 15 Dec	IndiGo
14 Dec - 25 Dec	Malaysia Airlines
30 Dec - 06 Jan	Malaysia Airlines
15 Dec - 22 Dec	Singapore Airlines	direct
16 Dec - 22 Dec	Air India
09 Dec - 14 Dec	Air India
23 Dec - 31 Dec	Air India
24 Dec - 02 Jan	Air India
10 Dec - 09 Jan	Singapore Airlines	direct
24 Dec - 02 Jan	Singapore Airlines	direct
30 Dec - 06 Jan	Singapore Airlines	direct
30 Dec - 02 Jan	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 371€

Return flights