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

Return flights

20 Dec - 04 Jan	T'way Air
23 Dec - 06 Jan	T'way Air
19 Dec - 02 Jan	T'way Air
01 Dec - 09 Dec	Jeju Air
09 Dec - 16 Dec	Jeju Air
20 Dec - 25 Dec	Air China
15 Dec - 19 Dec	Jeju Air
01 Dec - 05 Dec	Jeju Air
13 Dec - 17 Dec	Jeju Air
04 Dec - 13 Dec	Air China
04 Dec - 07 Dec	Air China
01 Dec - 08 Dec	Jeju Air
02 Dec - 08 Dec	Jeju Air
25 Dec - 13 Jan	Air China
26 Dec - 13 Jan	Air China
27 Dec - 13 Jan	Air China
31 Dec - 04 Jan	Air China
30 Dec - 03 Jan	Air China
27 Dec - 03 Jan	Air China
26 Dec - 02 Jan	Air China

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 453€

Return flights