The calculated distance (air line) between Ashtarak and Doğubayazıt is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Doğubayazıt is certainly longer, as only the direct route (as the crow flies) between Ashtarak and Doğubayazıt has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles