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

Return flights

18 Dec - 28 Dec	Air China
12 Dec - 14 Dec	Air China
12 Dec - 15 Dec	Air China
11 Dec - 16 Dec	T'way Air
04 Dec - 31 Dec	T'way Air
22 Dec - 08 Jan	Jeju Air
01 Dec - 30 Dec	T'way Air
10 Dec - 29 Dec	T'way Air
10 Dec - 31 Dec	T'way Air
13 Dec - 15 Dec	Air China
22 Dec - 30 Dec	Jeju Air
01 Dec - 01 Jan	T'way Air
24 Dec - 06 Jan	T'way Air
24 Dec - 07 Jan	T'way Air
24 Dec - 03 Jan	T'way Air
25 Dec - 01 Jan	Air China
24 Dec - 01 Jan	Air China
25 Dec - 05 Jan	Air China
22 Dec - 02 Jan	Jeju Air
25 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 231€

Return flights