The calculated distance (air line) between Phanom Sarakham and Chanthaburi is approximately 94 miles respectively 151 kilometers.
By car or train, the actual journey to Chanthaburi is certainly longer, as only the direct route (as the crow flies) between Phanom Sarakham and Chanthaburi has been calculated here.
Air line (approximately)
151 kilometers
81 nautical miles