The calculated distance (air line) between Boston Spa and Stoke-on-Trent is approximately 71 miles respectively 115 kilometers.
By car or train, the actual journey to Stoke-on-Trent is certainly longer, as only the direct route (as the crow flies) between Boston Spa and Stoke-on-Trent has been calculated here.
Air line (approximately)
115 kilometers
62 nautical miles