Chadwick International vs Seoul International School
🇰🇷 Seoul · Side-by-side comparison on verifiable public data.
Neither Chadwick International nor Seoul International School sits in a market with a public inspectorate, so both are assessed on verifiable accreditation, curriculum authorisation, and published data rather than an official quality rating. Curriculum is the core differentiator: Chadwick International offers IB while Seoul International School offers American — the choice should follow the family's target qualification system. Both are day schools with fees in the same market band — see the table below for the figures, and verify against each school's own published fees.
Key Facts
| Chadwick International | Seoul International School | |
|---|---|---|
| Curriculum | IB | American |
| Ages | 4–18 | 5–18 |
| Languages of instruction | English | English |
| Annual fees | KRW 51,591,690–60,197,655 | KRW 31,991,809–39,374,690 |
| Enrollment | 1,461 | — |
| Boarding | Day only | Day only |
| Accreditations | WASC, IB | WASC |
Strengths
- ✓Full IB continuum (PYP, MYP, DP — and CP, which is rare) across all divisions
- ✓Sister-school relationship to Chadwick School California, including shared outdoor/experiential education
- ✓Large purpose-built campus with extensive athletic and arts facilities (two gyms, 25m pool, climbing wall, track, tennis)
- ✓Strong reported diversity — 51 nationalities, 115 international college destinations
- ✓Favourable 8:1 student-faculty ratio (school-reported)
- ✓Deep AP program (22+ courses, school-reported) plus AP Capstone Diploma pathway
- ✓Long, continuous WASC accreditation (since 1979, renewed through 2021)
- ✓50+ year track record; first MoE-recognised foreign school post-liberation
- ✓Small class sizes (high school ~12–20; ~15 average reported 2017–18)
- ✓Purpose-built eight-acre campus with ongoing facility investment (2013 building, 2019 library upgrades)
Trade-offs
- !No public inspectorate in South Korea — quality data is accreditation-depth only; tier capped at A
- !High fees — KRW ~51.6M–60.2M/year (2025/26), among the most expensive in the region
- !CIS accreditation not confirmed — official site cites WASC and IB only
- !No published IB average score found in public sources
- !EAL/ESL support not documented publicly
- !No IB pathway — purely AP/American, less flexibility for IB-seeking families
- !Non-Korean residency/citizenship requirement excludes many local families
- !AP exam results / pass rates are not published publicly
- !EAL/ESL support not described publicly despite an English-only environment — unclear provision for non-native speakers
- !Seongnam location is outside central Seoul (a commute consideration)
Best Fit For
- • Families seeking a full IB-continuum education through DP and CP
- • Internationally mobile families wanting California sister-school linkage and US-style outdoor education
- • Students targeting overseas (especially US) university placement
- • Songdo/Incheon-based or capital-region expatriate families
- • Families holding non-Korean citizenship/PR seeking a US-curriculum, college-prep path
- • Students targeting US universities via a broad AP slate
- • Families wanting a small-class, established-community environment
University Placement
School-reported · not independently verified
School-reported, unverified: 115 international college destinations cited; specific university-placement lists are school-reported.
School-reported, unverified: no AP exam results, score distributions, or university-placement statistics are published in the sources accessed.
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Frequently Asked Questions
Should I choose Chadwick International or Seoul International School?
Chadwick International is best for: Families seeking a full IB-continuum education through DP and CP. Seoul International School is best for: Families holding non-Korean citizenship/PR seeking a US-curriculum, college-prep path. The right choice depends on target curriculum, budget, and family priorities — the two are not linearly comparable.
How do fees compare between Chadwick International and Seoul International School?
Chadwick International: KRW 51,591,690–60,197,655. Seoul International School: KRW 31,991,809–39,374,690. Verify against each school's own published fees; some figures are sourced from third-party aggregators.
What curricula do Chadwick International and Seoul International School offer?
Chadwick International: IB. Seoul International School: American.
Do Chadwick International or Seoul International School offer boarding?
Chadwick International: day school only. Seoul International School: day school only.
This comparison is BrightKey's independent assessment using verifiable public data only. University-placement figures are school-reported and not independently verified. BrightKey takes no payments from schools. Our method →