The calculated distance (air line) between Stratford-upon-Avon and Droitwich is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Droitwich is certainly longer, as only the direct route (as the crow flies) between Stratford-upon-Avon and Droitwich has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles