The calculated distance (air line) between Hat Yai and Nakhon Si Thammarat is approximately 104 miles respectively 168 kilometers.
By car or train, the actual journey to Nakhon Si Thammarat is certainly longer, as only the direct route (as the crow flies) between Hat Yai and Nakhon Si Thammarat has been calculated here.
Air line (approximately)
168 kilometers
91 nautical miles