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

Return flights

11 Dec - 15 Dec	AirAsia
11 Dec - 14 Dec	AirAsia
12 Dec - 14 Dec	AirAsia
01 Dec - 31 Dec	AirAsia	direct
05 Dec - 07 Dec	AirAsia	direct
01 Dec - 02 Dec	AirAsia	direct
13 Dec - 14 Dec	AirAsia	direct
26 Dec - 01 Jan	Royal Brunei
12 Dec - 14 Dec	Scoot	direct
28 Dec - 20 Jan	AirAsia	direct
26 Dec - 28 Dec	AirAsia	direct
11 Dec - 14 Dec	Scoot	direct
31 Dec - 01 Jan	Scoot
31 Dec - 01 Jan	Scoot	direct
25 Dec - 01 Jan	Scoot	direct
26 Dec - 01 Jan	Scoot	direct

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 $160

Return flights