The calculated distance (air line) between Southend-on-Sea and Canary Wharf is approximately 32 miles respectively 51 kilometers.
By car or train, the actual journey to Canary Wharf is certainly longer, as only the direct route (as the crow flies) between Southend-on-Sea and Canary Wharf has been calculated here.
Air line (approximately)
51 kilometers
28 nautical miles