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

Return flights

03 Dec - 31 Dec	T'way Air
03 Dec - 30 Dec	T'way Air
16 Dec - 16 Jan	Jeju Air
01 Dec - 31 Dec	T'way Air
01 Dec - 30 Dec	T'way Air
05 Dec - 08 Dec	Air China
24 Dec - 03 Jan	Air China
22 Dec - 03 Jan	Air China
22 Dec - 04 Jan	Air China
24 Dec - 01 Jan	Air China
22 Dec - 15 Jan	Air China
25 Dec - 01 Jan	Air China
19 Dec - 01 Jan	Air China
20 Dec - 31 Dec	T'way Air
25 Dec - 03 Jan	Air China
13 Dec - 16 Dec	Jeju Air
04 Dec - 08 Dec	T'way Air
03 Dec - 09 Dec	T'way Air
04 Dec - 10 Dec	T'way Air
24 Dec - 02 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 319€

Return flights