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

Return flights

23 Dec - 28 Dec	Jin Air
17 Dec - 29 Dec	T'way Air
16 Dec - 03 Jan	T'way Air
18 Dec - 29 Dec	Jeju Air
17 Dec - 31 Dec	T'way Air
15 Dec - 28 Dec	T'way Air
14 Dec - 28 Dec	T'way Air
18 Dec - 02 Jan	Jeju Air
20 Dec - 12 Jan	Jeju Air
18 Dec - 20 Jan	T'way Air
22 Dec - 29 Dec	T'way Air
23 Dec - 30 Dec	T'way Air
23 Dec - 02 Jan	T'way Air
22 Dec - 14 Jan	Jeju Air
19 Dec - 28 Dec	T'way Air
19 Dec - 24 Jan	T'way Air
24 Dec - 28 Dec	Jeju Air
18 Dec - 01 Jan	Jeju Air
31 Dec - 03 Jan	Air China
24 Dec - 12 Jan	T'way Air

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 $361

Return flights