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

Return flights

02 Dec - 07 Dec	AirAsia X
01 Dec - 07 Dec	AirAsia X
04 Dec - 07 Dec	AirAsia X
03 Dec - 07 Dec	AirAsia X
05 Dec - 07 Dec	AirAsia X
05 Dec - 04 Jan	T'way Air	direct
01 Dec - 03 Jan	Jeju Air	direct
03 Dec - 31 Dec	Scoot	direct
10 Dec - 26 Jan	Scoot	direct
02 Dec - 29 Dec	Jeju Air	direct
01 Dec - 31 Dec	Jeju Air	direct
09 Dec - 31 Dec	Jeju Air	direct
01 Dec - 29 Dec	Jeju Air	direct
05 Dec - 06 Jan	AirAsia X
16 Dec - 04 Jan	AirAsia X
04 Dec - 09 Jan	AirAsia X
19 Dec - 04 Jan	AirAsia
19 Dec - 23 Jan	AirAsia
22 Dec - 12 Jan	VietJet Air
25 Dec - 14 Jan	AirAsia X

Also check the deals for one-way flights from Seoul 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 Seoul to Singapore in December from 156€

Return flights