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

Return flights

24 Dec - 13 Jan	AirAsia	direct
25 Dec - 14 Jan	AirAsia	direct
25 Dec - 13 Jan	AirAsia	direct
12 Dec - 16 Dec	Malaysia Airlines
31 Dec - 18 Jan	AirAsia	direct
31 Dec - 14 Jan	AirAsia	direct
31 Dec - 13 Jan	AirAsia	direct
23 Dec - 12 Jan	AirAsia	direct
31 Dec - 17 Jan	AirAsia	direct
28 Dec - 01 Jan	Royal Brunei
24 Dec - 12 Jan	AirAsia	direct
02 Dec - 10 Dec	AirAsia	direct
02 Dec - 08 Dec	AirAsia	direct
07 Dec - 10 Dec	AirAsia	direct
07 Dec - 08 Dec	AirAsia	direct
02 Dec - 03 Dec	AirAsia	direct
12 Dec - 16 Dec	AirAsia	direct
02 Dec - 16 Dec	AirAsia	direct
07 Dec - 16 Dec	AirAsia	direct
03 Dec - 10 Dec	AirAsia

Also check the deals for one-way flights from Kota Kinabalu 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 Kota Kinabalu to Singapore in December from $166

Return flights