[5] Founded in 2010 and first opened in 2011 as part of the Jeju Global Education City,[6] the school's first senior class of 52 students matriculated in May 2016.

[11] Additionally, the school maintains associations with a number of international organizations (Thinking Collaborative™, St. Mark's School, the Massachusetts Institute of Technology, World Youth Adventures); participates in national KISAC, KIAC, KIMEA and JAC athletic conferences, as well as international Model United Nations and robotics conferences; collaborates with other international schools in providing professional learning opportunities in addition to hosting weekend workshops for its faculty and outside educators.

In winter 2023, KISJ collaborated with two neighbor international schools to host its first GEC Just Learning Conference since before the COVID pandemic.

The curriculum is standards-based using AP and American Education Reaches Out (AERO) standards, and planned using Understanding by Design.

The elementary school uses a standards-based approach to education, where progress in students' learning is communicated through levels (1-4) and on report cards.

Entrance into Honors courses requires a teacher recommendation and considers historical subject grades, standardized test scores (e.g. MAP, AMC, STAR Reading), and additional documentation as needed.

Currently there are 18 AP® courses offered, including English Language and Composition, English Literature and Composition, United States History, World History, Psychology, Chinese Language and Culture, Studio Art: 2-D Design, Biology, Chemistry, Environmental Science, Calculus AB and BC, Macroeconomics, Physics 1 and 2, Statistics, Seminar, and Research.

KISJ High School Theatre puts on 2 productions each year (a fall play and spring musical).

Previous productions include: High School Music-pocalpyse, A Midsummer Night's Dream, Almost, Maine, The Complete Works of William Shakespeare (Abridged), Our Town, The 25th Annual Putnam County Spelling Bee, 7 Stories, and Urinetown: The Musical!

[17] Korea International School, Jeju Campus is located in a rural but rapidly-developing area, with public transport service from the 755 bus.

The Elementary and Middle School Campus includes separate academic buildings, each with its own library, music practice rooms, auditoriums; shared facilities include a mid-sized turf athletic field, tennis and basketball courts, 25m swimming pool, and three dormitories.

Admission is selective (the average acceptance rate for 2016–17 was 35%), and applicants are evaluated based on past academic achievements, English-language proficiency, character skills, and grade-level capacity.

[21] Korea International School, Jeju Campus offers full-time boarding for students in Grades 6–12.

Boarders are cared for by 40 full-time overseas and Korean boarding staff, with academic faculty offering pastoral support for their advisory.

[12] KISJ dorm students are placed in houses according to their grade level and gender, and are provided with developmentally appropriate supervision and support by staff with experience in both academic and extracurricular programming.

Dorm staff promote an English-language environment and collaborate closely with teaching faculty to provide academic guidance during evening study halls.

House teams include a Korean staff member to facilitate parent communication and manage culturally sensitive issues, and divisional dorm offices provide effective administrative support during the daytime and evenings.

A dorm clubs program features a range of activities aligned with student interests and staff areas of expertise.

Current and past offerings include debate, service leading activities, horseback riding, golf, scuba diving, music lessons, hiking, team sports, culinary arts, yoga, ultimate frisbee, and subject-specific tutoring.

Dorm staff also plan weekly house activities to help students relax and connect, in addition to leading regular life skills and team-building sessions.