The calculated distance (air line) between Stoke-on-Trent and Milton Keynes is approximately 90 miles respectively 144 kilometers.
By car or train, the actual journey to Milton Keynes is certainly longer, as only the direct route (as the crow flies) between Stoke-on-Trent and Milton Keynes has been calculated here.
Air line (approximately)
144 kilometers
78 nautical miles