The calculated distance (air line) between Stratford-upon-Avon and Redditch is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Redditch is certainly longer, as only the direct route (as the crow flies) between Stratford-upon-Avon and Redditch has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles