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

Return flights

02 Dec - 09 Dec	Air China
05 Dec - 12 Dec	Air China
04 Dec - 11 Dec	Air China
03 Dec - 08 Dec	Air China
10 Dec - 14 Dec	China Eastern
12 Dec - 06 Jan	T'way Air
18 Dec - 29 Dec	Korean Air
01 Dec - 31 Dec	Air China
01 Dec - 06 Dec	Air China
13 Dec - 18 Dec	China Eastern
01 Dec - 05 Dec	Air China
30 Dec - 03 Jan	Eastar Jet
30 Dec - 06 Jan	T'way Air
24 Dec - 01 Jan	T'way Air
30 Dec - 01 Jan	T'way Air
30 Dec - 04 Jan	T'way Air
30 Dec - 02 Jan	T'way Air
24 Dec - 03 Jan	T'way Air
31 Dec - 04 Jan	T'way Air
19 Dec - 10 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 $294

Return flights