The calculated distance (air line) between Southam and Stratford-upon-Avon is approximately 14 miles respectively 23 kilometers.
By car or train, the actual journey to Stratford-upon-Avon is certainly longer, as only the direct route (as the crow flies) between Southam and Stratford-upon-Avon has been calculated here.
Air line (approximately)
23 kilometers
12 nautical miles