Wells International School

Wells International School began in 1998 as a small kindergarten on Sukhumvit Soi 47 and opened its first primary campus in 2003. Its main campus has been on Sukhumvit Road near On Nut BTS since 2006 and teaches Grades 1 to 12. The Thong Lo campus on Sukhumvit 51 runs a kindergarten for children aged about 2 to 7, and the Bang Na campus on Srinakarin Soi 62 in Prawet takes children from Nursery to Grade 5. A fourth campus opened in Chonburi in 2022.

Wells follows a university-preparatory American curriculum adjusted to meet Thai Ministry of Education rules. High school students can take Advanced Placement courses and, since 2013–14, the IB Diploma Programme. The school has been accredited by WASC since 2009 and is a member of ISAT and EARCOS. The On Nut campus has more than 500 students from around 50 nationalities. Students compete in TISAC sports, debate and performing arts, and incoming secondary students can apply for scholarships.

The On Nut campus has computer and science labs, a swimming pool, a gym and fitness room, a 'coliseum' sports hall, an auditorium, music and dance rooms, a playground and a cafeteria. Wells is one of the more moderately priced international schools in Bangkok. For 2026–2027, tuition per semester (two per year) is THB 129,500 for Nursery, THB 196,000 for Grades 1 and 2, THB 247,000 for Grades 7 and 8 and THB 285,000 for Grades 11 and 12. Lunch is THB 15,000 per semester. New students also pay a one-time campus development fee of up to THB 140,000 and a refundable deposit.