AirHint found the following cheapest return flights from Seoul (ICN) to Colombo (CMB) in December 2025 (see full year).

Return flights

01 Dec - 02 Dec	AirAsia X
22 Dec - 30 Dec	Air China
04 Dec - 13 Dec	Air China
03 Dec - 07 Dec	Air China
10 Dec - 14 Dec	Air China
26 Dec - 30 Dec	Air China
31 Dec - 04 Jan	Air China
27 Dec - 03 Jan	Air China
28 Dec - 03 Jan	Air China
28 Dec - 04 Jan	Air China
01 Dec - 06 Dec	Air China
15 Dec - 30 Dec	Thai AirAsia X
15 Dec - 16 Dec	Thai AirAsia X
04 Dec - 06 Dec	AirAsia X
24 Dec - 02 Jan	SriLankan Airlines	direct
31 Dec - 04 Jan	SriLankan Airlines	direct
31 Dec - 20 Jan	Thai AirAsia X
15 Dec - 03 Jan	Thai AirAsia X
15 Dec - 04 Jan	Thai AirAsia X
19 Dec - 08 Jan	Thai AirAsia X

Also check the deals for one-way flights from Seoul to Colombo 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 Colombo in December from $550

Return flights