Jeju City, Seoul Gimpo Intl, and Busan Gimhae are the top airports Jeju Air flies into and out of during the year.
A flight from Jeju City to Cheongju, which has 0 stops, is Rp 492,914 which is the least expensive round-trip domestic flight that Jeju Air offers. The cheapest one-way Jeju Air ticket is flying from Seoul Gimpo Intl to Jeju City. You can expect to pay around Rp 246,457 per ticket. This flight has 0 stops.
Jeju Air does not have flights from Denpasar Bali Ngurah Rai at the moment. There are scheduled flights with Jeju Air out of Kota Kinabalu though (if you don’t mind flying from this airport). Flying with AirAsia is recommended if you still want to fly from Denpasar Bali Ngurah Rai.