The calculated distance (air line) between Angkor Angk and Siem Reap is approximately 181 miles respectively 291 kilometers.
By car or train, the actual journey to Siem Reap is certainly longer, as only the direct route (as the crow flies) between Angkor Angk and Siem Reap has been calculated here.
Air line (approximately)
291 kilometers
157 nautical miles