AirHint found the following cheapest return flights from Seoul (ICN) to Cheju (CJU) in January 2026 (see full year).

Return flights

20 Jan - 23 Jan	China Southern
20 Jan - 22 Jan	China Southern
24 Jan - 28 Jan	China Eastern
17 Jan - 24 Jan	Tianjin Airlines
21 Jan - 24 Jan	China Eastern
24 Jan - 26 Jan	China Southern
22 Jan - 26 Jan	China Southern
28 Jan - 31 Jan	China Eastern
23 Jan - 27 Jan	Air China
22 Jan - 24 Jan	China Southern
26 Jan - 02 Feb	HK Express
30 Jan - 04 Feb	HK Express
30 Jan - 01 Feb	China Eastern
31 Jan - 03 Feb	China Eastern
30 Jan - 06 Feb	HK Express
30 Jan - 02 Feb	HK Express
30 Jan - 18 Feb	Shanghai Airlines

Also check the deals for one-way flights from Seoul to Cheju in January.

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 Cheju in January from $327

Return flights