The calculated distance (air line) between West Molesey and Southend-on-Sea is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Southend-on-Sea is certainly longer, as only the direct route (as the crow flies) between West Molesey and Southend-on-Sea has been calculated here.
Air line (approximately)
77 kilometers
42 nautical miles