Depending on the route of the flight the age of the unaccompanied minor varies. However, no child under the age of 5 years old is allowed to travel alone. For international flights the minor is charged the adult fare and for domestic flights the minor is charged a child fare.
Please contact and confirm the service with JEJU Air Reservation Center(1599-1500) at least 24 hours prior to the departure time. Please visit here for further information.