The calculated distance (air line) between Chon Buri and Suphan Buri is approximately 96 miles respectively 155 kilometers.
By car or train, the actual journey to Suphan Buri is certainly longer, as only the direct route (as the crow flies) between Chon Buri and Suphan Buri has been calculated here.
Air line (approximately)
155 kilometers
83 nautical miles