The calculated distance (air line) between Steffisburg and Zürich (Kreis 10) is approximately 60 miles respectively 96 kilometers.
By car or train, the actual journey to Zürich (Kreis 10) is certainly longer, as only the direct route (as the crow flies) between Steffisburg and Zürich (Kreis 10) has been calculated here.
Air line (approximately)
96 kilometers
52 nautical miles