Singapore International School Thonburi
Location
Riverside and Thonburi
138 Ratchamontri Road, Khlong Khwang, Phasi Charoen, Bangkok 10160
Ages
Ages 2 to 18 (Nursery 1 to Grade 12)
Language of Instruction
English, with Chinese and Thai
Yearly Fees
401,700 to 789,300 THB a year (2026/27)
As stated by the school, November 2026. Depends on age and programme, so confirm with the school.
Founded
2018
SISB Thonburi, on Ratchamontri Road in Phasi Charoen, opened in 2018 and takes children from Nursery 1 to Grade 12, ages 2 to 18. It is the SISB campus for families on the Thonburi side of the river.
Nursery and Kindergarten follow the UK Early Years Foundation Stage, and Primary follows the Singapore curriculum, known for its strength in Maths and Science. Grades 7 and 8 combine the Singapore and UK curricula, Grades 9 and 10 take the Cambridge IGCSE, and Sixth Form (Grades 11 and 12) takes Cambridge AS and A Levels.
The school puts weight on development outside lessons too, with extracurricular activities and experiential learning programmes. Families who want the IB Diploma at Sixth Form would look at SISB's Pracha Uthit campus instead.
Admissions: enrol.tr@sisb.ac.th, +66 2153 9393 ext. 1.