The calculated distance (air line) between Stoke-on-Trent and Dagenham is approximately 141 miles respectively 227 kilometers.
By car or train, the actual journey to Dagenham is certainly longer, as only the direct route (as the crow flies) between Stoke-on-Trent and Dagenham has been calculated here.
Air line (approximately)
227 kilometers
123 nautical miles