The calculated distance (air line) between Phanom Thuan and Chon Buri is approximately 101 miles respectively 163 kilometers.
By car or train, the actual journey to Chon Buri is certainly longer, as only the direct route (as the crow flies) between Phanom Thuan and Chon Buri has been calculated here.
Air line (approximately)
163 kilometers
88 nautical miles