The calculated distance (air line) between Tikrīt and Ālbū Kamāl is approximately 158 miles respectively 253 kilometers.
By car or train, the actual journey to Ālbū Kamāl is certainly longer, as only the direct route (as the crow flies) between Tikrīt and Ālbū Kamāl has been calculated here.
Air line (approximately)
253 kilometers
137 nautical miles