The calculated distance (air line) between Ağrı and Doğubayazıt is approximately 57 miles respectively 91 kilometers.
By car or train, the actual journey to Doğubayazıt is certainly longer, as only the direct route (as the crow flies) between Ağrı and Doğubayazıt has been calculated here.
Air line (approximately)
91 kilometers
49 nautical miles