The calculated distance (air line) between Kampong Cham and Smach Mean Chey is approximately 167 miles respectively 269 kilometers.
By car or train, the actual journey to Smach Mean Chey is certainly longer, as only the direct route (as the crow flies) between Kampong Cham and Smach Mean Chey has been calculated here.
Air line (approximately)
269 kilometers
145 nautical miles