The calculated distance (air line) between Andoung Trabaek and Siem Reap is approximately 178 miles respectively 286 kilometers.
By car or train, the actual journey to Siem Reap is certainly longer, as only the direct route (as the crow flies) between Andoung Trabaek and Siem Reap has been calculated here.
Air line (approximately)
286 kilometers
155 nautical miles