Notes / Bangkok
Best Value International Schools in Bangkok
Bangkok's international fees run from THB 90,000 to THB 1.24 million. The schools that sit above the value line publish results, hold international accreditation, and charge less than their outcomes would predict.
Comparison table
| School | Curriculum | Fees range (THB) | Results | Notes |
|---|---|---|---|---|
| Beaconhouse Yamsaard (BYIS) | International, A Level, IB DP | 219,000–256,000 | IB DP 38 (2024); 52% A*-A at A Level | Prawet; CIS and NEASC accredited |
| Ramkhamhaeng Advent (RAIS) | American, AP | 185,000–230,000 | SAT 1343 avg; IELTS 7.0 avg (2024-25) | Hua Mak; WASC and ONESQA; Adventist foundation |
| Modern International (MISB) | British, Cambridge, Edexcel | 234,000–307,000 | 94% IGCSE pass rate | Sukhumvit; no international accreditor |
| Trinity International (TRIS) | American, AP | 250,000–322,000 | 60% AP at 3+; SAT 1100–1540 (2022) | Khlong Toei; WASC and ONESQA |
| TSI International (TSI) | British, Cambridge | 240,000–377,000 | IGCSE 50% A-A; 92% A-C (2023-24) | Bearing; CIS-accredited; founded 1985 |
| Satit Bilingual (SBS) | IB PYP, Cambridge | 218,000–333,000 | IGCSE all C+ in cohort; 100% uni 2020 | Pathum Thani; bilingual; OBEC and ONESQA |
| Bangkok Christian (BCIS) | American, AP | 246,000–333,000 | Multiple 5/5 AP scores (2024, 2025) | Suan Luang; COGNIA; faith-based |
| Satit Pattana (Secondary) | International, Cambridge, AP | 332,000–489,000 | 100% uni-bound; 80% Thai Portfolio (2025) | Bangkok; ONESQA-rated |
| Heathfield (HISB) | British | 258,000–512,000 | Cambridge SEA Top Performer awards | Saphan Sung; CIS and NEASC |
| Roong Aroon | IB MYP, IB DP | 450,000 | IB DP 34 (2025); 94% pass rate | Bangkok; arts and music focus |
The brief
- The strongest value at the mid-tier is Beaconhouse Yamsaard in Prawet: an IB DP average of 38 points and *52% A-A at A Level at top fees of THB 256,000**.
- Bangkok Christian International posts repeated 5/5 AP scores across maths and the arts at top fees of THB 333,000, well below the AP-strong premium tier.
- TSI International at THB 240,000–377,000 publishes *50% A-A and 92% A-C at IGCSE*, with CIS accreditation. That outcome profile typically sits in the THB 700,000-plus tier.
- The value ceiling sits around THB 540,000. Above that the city's premium brands kick in, and the fee-to-outcome ratio swings the other way.
- The schools above the line are mostly American-curriculum, Christian-foundation or Thai-Cambridge bilingual, not the British brands that dominate Sukhumvit's billboards.
# Best Value International Schools in Bangkok
Bangkok · Fees & Costs
Bangkok runs one of the widest international-school fee spreads in Asia. The bottom of the market opens around THB 90,000 a year. The top of the market crosses THB 1.24 million at sixth form. Between the two sit roughly 70 schools, and the interesting question is which of them sit above the line that fees-to-outcomes draws across the city.
Thailand publishes a usable set of public quality signals: ONESQA ratings, OBEC registration, IB DP averages, IGCSE distributions, AP score profiles and CIS, NEASC, WASC and COBIS accreditation. The 10 schools below all publish enough of those to be evaluated. Each charges less than the Bangkok median would predict.
What "value" means here
Value is the gap between what a school charges and what its outcomes, accreditation and infrastructure suggest it could charge. A school billing THB 300,000 with published IB results above the world average and CIS accreditation sits above the line. A school billing THB 800,000 with no published results and no international accreditor sits below it.
Three signals do most of the work in Bangkok. Published exam results: IB DP averages, IGCSE distributions, AP profiles or SAT bands. Schools that publish are accountable; schools that do not are asking for trust without evidence. External accreditation: CIS, NEASC, WASC, COBIS or COGNIA, in roughly that order of weight. ONESQA and OBEC are Thai state regulators and matter for legal status, not for international quality assurance. Curriculum coverage: a school running a full Cambridge or IB continuum with sixth form sits at a different infrastructure cost from a primary-only Cambridge stream.
The 10 schools below clear all three signals at fees between THB 220,000 and THB 540,000.
The schools above the line
Beaconhouse Yamsaard (BYIS) in Prawet sits at the top of any Bangkok value list. Fees run THB 219,000–256,000 and the 2024 IB Diploma average of 38 points is eight points above the world average, with *52% A-A at A Level. Holds CIS and NEASC** accreditation, which at this fee level is unusual. Part of the wider Beaconhouse group, founded locally in 1984.
Ramkhamhaeng Advent (RAIS) in Hua Mak charges THB 185,000–230,000 and posts a SAT average of 1343 (high of 1530) and an IELTS average of 7.0 for 2024-25. American curriculum with AP, WASC plus Thai ONESQA accreditation. A small Adventist-foundation school running since 1999, drawing students from 18 nationalities.
Modern International (MISB) between Petchaburi and Sukhumvit runs the British pathway to IGCSE and A Level at THB 234,000–307,000, around half the BTS-core British average. Cambridge and Edexcel boards. Published 94% IGCSE pass rate as a recent benchmark. No international accreditor on file, which is what gives at this price.
Trinity (TRIS) in Khlong Toei charges THB 250,000–322,000 for an American AP curriculum with WASC and ONESQA. Published 2022 results show 60% of AP scores at 3 or higher and an SAT range of 1100–1540. Central BTS-line location at near-suburban fees.
TSI International School in Bearing, Samut Prakan, charges THB 240,000–377,000 for the Cambridge pathway. CIS-accredited. Published 2023-24 IGCSE results: *50% A-A, 92% A-C, with one student placing first in Thailand at AS Level*. Originally founded in 1985 as Thai Sikh International, around 400 pupils across two campuses.
Satit Bilingual School of Rangsit University (SBS) in Pathum Thani is a bilingual Thai-English IB PYP plus Cambridge secondary school at THB 218,000–333,000. Around 900 pupils. Published a recent IGCSE cohort with all 13 candidates achieving grade C or above, and 100% university admission in 2020. Holds OBEC and ONESQA registration as a Thai-founded school, not international accreditation, which is the structural compromise of the bilingual model.
Bangkok Christian International School (BCIS) in Suan Luang charges THB 246,000–333,000 and publishes multiple 5/5 AP scores across AP Chinese, AP 2-D Art, AP Calculus AB and BC, AP Music Theory and AP Chemistry across 2024 and 2025. COGNIA-accredited. Faith-based, Thai-Korean missionary foundation, open to families of all faiths.
Satit Pattana School (Secondary), founded 2007, runs a Cambridge-and-AP-influenced pathway for ages 14–18 at THB 332,000–489,000. Class of 2025 hit 100% university-bound, with 80% securing places in the Thai Portfolio Round including Chulalongkorn, Mahidol and Thammasat. ONESQA-rated.
Heathfield International School Bangkok (HISB) in Saphan Sung charges THB 258,000–512,000 for the English National Curriculum through Year 12. Holds CIS and NEASC, both at the unusual end of the price band. Cambridge "Top Performers" recognition: five Go Further Awards in Southeast Asia, nine awards in Thailand for top results in recent sittings.
Roong Aroon International School in Bangkok runs the IB MYP and DP with a specialist focus on arts and music. Flat fees at THB 450,000 with a 2025 IB DP average of 34 points and 94% pass rate. Smaller cohort. No international accreditor on the public record, which puts a question against the listing, but the published IB outcome is solid for the fee level.
Where the compromises land
The mid-tier value picks share three structural features that buyers should weigh honestly.
Smaller cohorts. Most of the schools above sit between 300 and 900 pupils. That means lower fixed costs and tighter class sizes, also fewer specialist staff, narrower subject menus and a thinner peer group at any given year. A school of 300 cannot run the same breadth of music, sports, language and university counselling as a school of 1,500.
Outer-ring locations. Pathum Thani, Nonthaburi, Samut Prakan, Saphan Sung and Suan Luang sit on the edge of Greater Bangkok, not in the BTS core. Land is cheaper there, and so are the fees. Most of the schools above offer bus networks; central Sukhumvit families should price the daily door-to-door time as carefully as the fee.
Thai or Christian foundations. Several of the strongest value schools are Thai-founded, missionary-founded or bilingual. That changes student-body composition, the language environment at break and the calendar around religious observance. A family expecting an expatriate-majority international school will need to ask the right questions on tour.
Schools above the line are accountable about results, accept external scrutiny, and charge a Bangkok-mid-tier fee for outcomes that elsewhere would carry a premium price.
How to read a value claim
A school's brochure will frame value as breadth of curriculum, calibre of staff or alumni outcomes. Those are conditions, not facts. Three questions tend to separate the real claim from the rhetorical one.
Fact. Does the school publish a current IB DP average, IGCSE grade distribution or AP score profile, with the cohort size attached? A 38-point IB average across two students is not the same as a 38-point average across eighty. The number means little without the denominator.
Condition. Does the accreditation cover the whole school or only a stage? Some schools hold CIS for primary only, or WASC for secondary only. Others hold ONESQA, which is a Thai state regulator and not an international quality assurance body. The condition under which the accreditation applies sets the real meaning of the badge.
Question. What does the staff retention look like over the last three years? Higher fees should fund higher salaries and longer tenure. A school charging mid-tier fees with stable teaching staff is delivering more value than a school charging premium fees with annual turnover. Ask the question; the answer is rarely on the website.
FAQs
What's the Bangkok fee range for international schools? Roughly THB 90,000 to THB 1.24 million a year at top fees. The mid-tier sits around THB 250,000 to THB 540,000, where most of the value picks live.
Which Bangkok schools publish IB results? At the mid-tier: Beaconhouse Yamsaard (38-point 2024 average), Roong Aroon (34-point 2025 average). At the premium tier, several others publish similar or higher.
Is ONESQA the same as CIS accreditation? No. ONESQA is Thailand's state quality-assurance body and is required for Thai-registered schools. CIS, NEASC, WASC and COBIS are international accreditors. A school holding ONESQA alone has cleared Thai regulatory checks but not the international ones.
Are British-curriculum schools generally better value in Bangkok? Not at the mid-tier. The strongest value picks in Bangkok run American, Cambridge or bilingual pathways. The biggest British brands cluster in the THB 700,000-plus band.
What's the lowest fee at a fully internationally accredited school in Bangkok? Beaconhouse Yamsaard at THB 219,000 with CIS and NEASC is among the lowest for a school holding two international accreditors.
How small is too small for a secondary cohort? A sixth-form cohort under about 20 students per year tends to limit the practical subject menu, especially in sciences and languages. Most of the schools above sit comfortably above that floor at IGCSE but should be checked carefully at A Level or IB DP.