The calculated distance (air line) between Otdam Souriya and Kampong Chhnang is approximately 82 miles respectively 132 kilometers.
By car or train, the actual journey to Kampong Chhnang is certainly longer, as only the direct route (as the crow flies) between Otdam Souriya and Kampong Chhnang has been calculated here.
Air line (approximately)
132 kilometers
71 nautical miles