The calculated distance (air line) between Steffisburg and Zürich (Kreis 9) is approximately 58 miles respectively 93 kilometers.
By car or train, the actual journey to Zürich (Kreis 9) is certainly longer, as only the direct route (as the crow flies) between Steffisburg and Zürich (Kreis 9) has been calculated here.
Air line (approximately)
93 kilometers
50 nautical miles