The calculated distance (air line) between Stuttgart and Zürich (Kreis 4) / Hard is approximately 101 miles respectively 163 kilometers.
By car or train, the actual journey to Zürich (Kreis 4) / Hard is certainly longer, as only the direct route (as the crow flies) between Stuttgart and Zürich (Kreis 4) / Hard has been calculated here.
Air line (approximately)
163 kilometers
88 nautical miles