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

Return flights

16 Dec - 19 Dec	China Eastern
02 Dec - 29 Dec	T'way Air
01 Dec - 31 Dec	T'way Air
01 Dec - 30 Dec	T'way Air
08 Dec - 11 Jan	T'way Air
24 Dec - 01 Jan	Air China
24 Dec - 03 Jan	Air China
15 Dec - 07 Jan	Air China
21 Dec - 25 Dec	China Eastern
22 Dec - 15 Jan	Air China
05 Dec - 22 Dec	Air China
05 Dec - 08 Dec	Air China
25 Dec - 03 Jan	Air China
23 Dec - 28 Dec	China Eastern
24 Dec - 31 Dec	Air China
03 Dec - 09 Dec	T'way Air
24 Dec - 02 Jan	T'way Air
30 Dec - 04 Jan	Air China
26 Dec - 03 Jan	Air China
26 Dec - 01 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 $336

Return flights