The calculated distance (air line) between Stourport-on-Severn and Swansea is approximately 86 miles respectively 139 kilometers.
By car or train, the actual journey to Swansea is certainly longer, as only the direct route (as the crow flies) between Stourport-on-Severn and Swansea has been calculated here.
Air line (approximately)
139 kilometers
75 nautical miles