Which TEFL course is best for teaching in Thailand?

What Thai schools and the licence waiver system check

Thailand runs on a temporary teaching-licence waiver system for foreign teachers without a Thai teaching qualification, and that waiver process typically expects proof of an accredited TEFL certificate of around 100-120 hours. Schools in Bangkok, Chiang Mai or smaller provincial towns will usually ask for this upfront because it's tied to their own compliance, not just their hiring preference.

Some schools additionally want to see that the course included teaching practice or at least an assessed final component, particularly government programme placements and better-regarded bilingual schools, since a purely self-paced, unassessed certificate reads as a weaker submission during the waiver paperwork.

120-hour vs Level 5 vs CELTA for Thailand

A 120-hour accredited course is the standard most Thai language schools and government teaching programmes list, and it's usually sufficient on its own for the licence waiver process. Level 5 is worth the upgrade if you want access to international schools, well-known bilingual chains, or kindergarten programmes that receive more applicants than typical local schools — see our kindergarten-specific guide for more on that niche.

CELTA isn't the norm for Thailand's mainstream market and costs far more than what most schools expect from a candidate. It only makes sense if you're using Thailand as one stop before targeting a premium market elsewhere.

What gets rejected in practice

The most common rejection is a certificate under 100 hours submitted for the licence waiver — schools generally won't push paperwork through for it, which can delay a start date by weeks while you complete a proper course. Unaccredited providers with no verifiable backing cause the same problem, so check a course's accreditation before paying, not after a school flags it.