The calculated distance (air line) between Amphoe Sikhiu and Chon Buri is approximately 117 miles respectively 188 kilometers.
By car or train, the actual journey to Chon Buri is certainly longer, as only the direct route (as the crow flies) between Amphoe Sikhiu and Chon Buri has been calculated here.
Air line (approximately)
188 kilometers
101 nautical miles