Trinity International School
โรงเรียนนานาชาติทรินิตี้
฿251K – ฿358K
Including Admission Fees and Annual Tuition
American
Curriculum
AP, Thai Matayom 6
3–18
Age
Kindergarten › High School
English
Language
Also taught:
400
Students
17 nationalities
59% foreigners
Trinity International School was founded in 2003 with a clear purpose: to give families in the Sukhumvit area access to a quality American international education at a genuinely accessible price. That founding intention has held.
Around 450 students from Kindergarten through Grade 12, Seventh-day Adventist values embedded in daily school life, and fees running from roughly 194,850 to 299,450 THB annually, making this one of the most affordable full K-12 American curriculum schools in Bangkok. The curriculum follows the California Common Core framework and is WASC-accredited, with AP courses available at upper secondary and a UC Berkeley partnership supporting STEM enrichment.
English, Thai, and Mandarin are all taught. As with ICS and EIS, the faith-based ethos is worth understanding before you visit: Christian values and Adventist principles shape the school culture, and families from all backgrounds are welcome.
The campus is at 30 Sukhumvit Soi 36 in Klong Toei, a short ride from Thong Lo BTS, with a school van service covering nearby areas. For families in the Sukhumvit corridor who want a full K-12 American pathway, a values-based environment, and fees that leave real room in the family budget, TRIS is one of the most consistently underrepresented schools on Bangkok shortlists.
Trinity Fees
Admission & Enrollment
฿41,000(฿22,000 refundable)
one-time fees
Annual Tuition
฿154,250 – ฿220,870
depends on year group
Total 1st year
Including Admission Fees and Annual Tuition
฿250,900 – ฿358,360
Admission & Enrollment
฿41,000(฿22,000 refundable)
one-time fees
Annual Tuition
฿154,250 – ฿220,870
depends on year group
Total 1st year
฿250,900 – ฿358,360
Including Admission Fees and Annual Tuition
Tuition Fees (2025–2026)
On this page
Key Facts
American
Curriculum
English
Language
400
Students
17+
Nationalities
59%
Foreigners
07:30 – 15:00
School Day
18
Avg. Class Size
25
Max Class Size
1:10
Teacher / Student
2003
Founded
For Parents
Trinity International School positions itself as an accessible entry point into the American educational system within Bangkok's competitive Sukhumvit corridor. Established in 2003, the school follows the California Common Core standards, providing a clear pathway from kindergarten through to a grade 12 graduation.
Unlike larger institutional campuses nearby, this school maintains a smaller scale that prioritizes individual student progress and an all-encompassing development model rooted in Seventh-day Adventist principles.
The academic framework is bolstered by a partnership with UC Berkeley's GEMS program, which specifically strengthens the mathematics and science components of the elementary and middle school years. This focus on STEM-aligned inquiry, combined with a dedicated values-based program, creates an environment where academic study is intentionally paired with character development.
The school serves a diverse population of approximately 450 students, remaining particularly popular with families who seek a community-centric atmosphere over the high-pressure competitive environments typical of premium-tier schools. The day-to-day experience at the campus is characterized by a traditional yet supportive teaching approach. Class sizes are capped at 25, though many grade levels operate with fewer students, allowing for a teacher-student ratio that supports personalized instruction.
The English as a Second Language (ESL) program is a critical component of operations, employing specialized instructors to help non-native speakers transition into mainstream classrooms through intensive support and mandatory summer sessions. Facilities include specialized science laboratories, a computer lab, and athletic courts used for the Greater Bangkok Athletic Conference competitions. T
echnology is integrated into the curriculum through smartboard-equipped classrooms and robotics and programming courses starting in elementary school. The campus's location near the Thong Lo BTS station provides a significant advantage for commuting families, although the residential nature of Soi 36 means parents must navigate local traffic patterns that shift during peak hours. Families considering Trinity must weigh the benefits of its intimate community against the trade-offs of a smaller urban campus. While the school offers Advanced Placement (AP) courses for high school students, the breadth of electives and extracurricular facilities is naturally more limited than at Bangkok's flagship international schools.
The Seventh-day Adventist affiliation is a structural reality, influencing the calendar and the values program, though the school maintains an open policy for students of all faiths. Recent renovations have addressed older building concerns, yet the vertical campus design lacks the expansive green spaces found in suburban districts. Academic results in SAT and AP exams show a consistent track record of university matriculation, but the environment is less about elite competition and more about steady, inclusive growth. It is best suited for parents who prioritize a safe, values-oriented community and a manageable tuition structure while remaining within the central Sukhumvit residential area.
Frequent Questions about Trinity
Facilities
Extracurricular Activities
16+
activities per term
Accreditations & Memberships
Trinity Fees
Admission & Enrollment
฿41,000(฿22,000 refundable)
one-time fees
Annual Tuition
฿154,250 – ฿220,870
depends on year group
Total 1st year
Including Admission Fees and Annual Tuition
฿250,900 – ฿358,360
Admission & Enrollment
฿41,000(฿22,000 refundable)
one-time fees
Annual Tuition
฿154,250 – ฿220,870
depends on year group
Total 1st year
฿250,900 – ฿358,360
Including Admission Fees and Annual Tuition
Tuition Fees (2025–2026)
Key Facts
American
Curriculum
English
Language
400
Students
17+
Nationalities
59%
Foreigners
07:30 – 15:00
School Day
18
Avg. Class Size
25
Max Class Size
1:10
Teacher / Student
2003
Founded
For Parents
Trinity International School positions itself as an accessible entry point into the American educational system within Bangkok's competitive Sukhumvit corridor. Established in 2003, the school follows the California Common Core standards, providing a clear pathway from kindergarten through to a grade 12 graduation.
Unlike larger institutional campuses nearby, this school maintains a smaller scale that prioritizes individual student progress and an all-encompassing development model rooted in Seventh-day Adventist principles.
The academic framework is bolstered by a partnership with UC Berkeley's GEMS program, which specifically strengthens the mathematics and science components of the elementary and middle school years. This focus on STEM-aligned inquiry, combined with a dedicated values-based program, creates an environment where academic study is intentionally paired with character development.
The school serves a diverse population of approximately 450 students, remaining particularly popular with families who seek a community-centric atmosphere over the high-pressure competitive environments typical of premium-tier schools. The day-to-day experience at the campus is characterized by a traditional yet supportive teaching approach. Class sizes are capped at 25, though many grade levels operate with fewer students, allowing for a teacher-student ratio that supports personalized instruction.
The English as a Second Language (ESL) program is a critical component of operations, employing specialized instructors to help non-native speakers transition into mainstream classrooms through intensive support and mandatory summer sessions. Facilities include specialized science laboratories, a computer lab, and athletic courts used for the Greater Bangkok Athletic Conference competitions. T
echnology is integrated into the curriculum through smartboard-equipped classrooms and robotics and programming courses starting in elementary school. The campus's location near the Thong Lo BTS station provides a significant advantage for commuting families, although the residential nature of Soi 36 means parents must navigate local traffic patterns that shift during peak hours. Families considering Trinity must weigh the benefits of its intimate community against the trade-offs of a smaller urban campus. While the school offers Advanced Placement (AP) courses for high school students, the breadth of electives and extracurricular facilities is naturally more limited than at Bangkok's flagship international schools.
The Seventh-day Adventist affiliation is a structural reality, influencing the calendar and the values program, though the school maintains an open policy for students of all faiths. Recent renovations have addressed older building concerns, yet the vertical campus design lacks the expansive green spaces found in suburban districts. Academic results in SAT and AP exams show a consistent track record of university matriculation, but the environment is less about elite competition and more about steady, inclusive growth. It is best suited for parents who prioritize a safe, values-oriented community and a manageable tuition structure while remaining within the central Sukhumvit residential area.
Frequent Questions about Trinity
Facilities
Extracurricular Activities
16+
activities per term