The calculated distance (air line) between Sarpol-e Z̄ahāb and Tikrīt is approximately 125 miles respectively 201 kilometers.
By car or train, the actual journey to Tikrīt is certainly longer, as only the direct route (as the crow flies) between Sarpol-e Z̄ahāb and Tikrīt has been calculated here.
Air line (approximately)
201 kilometers
108 nautical miles