The calculated distance (air line) between Tikrīt and Al Miqdādīyah is approximately 84 miles respectively 136 kilometers.
By car or train, the actual journey to Al Miqdādīyah is certainly longer, as only the direct route (as the crow flies) between Tikrīt and Al Miqdādīyah has been calculated here.
Air line (approximately)
136 kilometers
73 nautical miles