The calculated distance (air line) between Steffisburg and Zürich (Kreis 11) is approximately 61 miles respectively 98 kilometers.
By car or train, the actual journey to Zürich (Kreis 11) is certainly longer, as only the direct route (as the crow flies) between Steffisburg and Zürich (Kreis 11) has been calculated here.
Air line (approximately)
98 kilometers
53 nautical miles