Seoul International School
International School in Seoul
Quick answer
Seoul International School (SIS) serves 850 students from 15 nationalities aged 3 to 18 in Seongnam (Seoul metro). The school delivers an American curriculum with strong AP courses for senior school. Accredited by WASC and ECIS. Tuition $23,698-$29,166 per year. Strong fit for international expat families on Seoul-metro corporate assignments seeking American-track education with US-college progression, complementing newer KIS Pangyo and Chadwick Songdo options for the Greater Seoul corridor.
Key facts
- Curriculum: American leaving qualifications include AP.
- Tuition: $23,698–$29,166/yr published annual range.
- Avg class size: 15 (max 20) Seoul international school · 850 students total.
- 15 nationalities top: Korean.
- Ages: Ages 3 to 18 school day starts at 8.00.
- Accreditations: WASC, ECIS verified.
850
15 (Korean)
15 avg / 20 max
Rolling
WASC, ECIS
AP
About Seoul International School
High academic standing - great students and community
| Item | Amount |
|---|---|
| Annual tuition (USD) | $23,698 – $29,166 |
| Annual tuition (local) | ₩31991809-₩39374690 |
| Fee year | 2025-2026 |
| True annual cost (with hidden fees)how we calculate | $29,402(+11%) |
| First-year total (with registration + deposit) | $30,902 |
| Cost position in Seoul | 81th percentile(premium tier) |
American
AP
SAT, AP,
At the top compared to any school.
Chinese-Mandarin Spanish
EAL and Learning Support in Grades Kg - 8
Yes
Yes
8.00 – 15.00
Yes
Yes
Is Seoul International School right for your family?
A School Fit Brief scores this school against your children's ages, learning needs, and budget — with hidden fee analysis, admissions timing, and a ranked shortlist of alternatives in Seoul.
Get School Fit Brief — $49One-time purchase · PDF + workspace · Source-backed analysis
At a Glance
Fee Position in Seoul
Mid-rangeSchool Profile
Class Size
Student Diversity
Moderately diverse
Common: Korean
Estimated Real Cost
Tuition + registration, transport, uniform, exams
Decide on this school — and four others
The $49 School Fit Brief covers Seoul International School and 4 other top schools in Seoul — tuition + true cost, curriculum fit, admission timeline, and red flags. Builds your shortlist in 8 minutes vs the $1,500–3,500 (and 2–4 weeks) an education consultant charges for the same answer.
Disclaimer: School profiles are source-backed decision aids, not endorsements or official rankings. Tuition figures are approximate and may not include registration fees, uniforms, transport, or exam costs. Always verify directly with the school before applying. WhereNext is not affiliated with any school listed. This is not admissions consulting, legal advice, or official school placement guidance.