The calculated distance (air line) between Krabi and Nakhon Si Thammarat is approximately 76 miles respectively 123 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 Krabi and Nakhon Si Thammarat has been calculated here.
Air line (approximately)
123 kilometers
66 nautical miles