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

Return flights

18 May - 22 May	China Southern
11 May - 29 May	China Southern
08 May - 12 May	Aero K Airlines
01 May - 08 May	HK Express
01 May - 04 May	HK Express
21 May - 25 May	T'way Air
01 May - 06 May	HK Express
09 May - 20 May	Scoot
16 May - 23 May	Korean Air
11 May - 18 May	Korean Air
30 May - 06 Jun	Korean Air
27 May - 02 Jun	Jeju Air

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

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 May from $336

Return flights