For domestic flights in Thailand, a PCR test is not required if you are fully vaccinated. Passengers can travel without presenting a PCR test as long as they have vaccination certification. Some comments also mention that an ATK test may be accepted.
David *********
Atk test or vaccine cert
Danny *******
Yeah as long as you vaccinated seems okay. My friend flew from Samui to Bkk, no problem.
Bernie ********
No just fully vaccinated
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Bernie ********
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Thai Visa Advice and Everything Else
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