The calculated distance (air line) between Riehen and Zürich (Kreis 2) is approximately 44 miles respectively 71 kilometers.
By car or train, the actual journey to Zürich (Kreis 2) is certainly longer, as only the direct route (as the crow flies) between Riehen and Zürich (Kreis 2) has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles