What are the current restrictions and documents required for internal flights in Thailand?

Traveling internally within Thailand, such as from Bangkok to Krabi, generally requires either proof of full vaccination or a recent negative COVID-19 test (usually within 72 hours). Specific requirements may vary, so it's advisable to check with the airline for the most current information. For domestic travel, an antigen test may also be acceptable in lieu of a negative RT-PCR test. As of now, there are no significant restrictions on car travel, and travelers have reported no issues when driving between locations.