The calculated distance (air line) between Southend-on-Sea and Sutton Coldfield is approximately 129 miles respectively 207 kilometers.
By car or train, the actual journey to Sutton Coldfield is certainly longer, as only the direct route (as the crow flies) between Southend-on-Sea and Sutton Coldfield has been calculated here.
Air line (approximately)
207 kilometers
112 nautical miles