The calculated distance (air line) between Frutigen and Zürich (Kreis 3) is approximately 67 miles respectively 107 kilometers.
By car or train, the actual journey to Zürich (Kreis 3) is certainly longer, as only the direct route (as the crow flies) between Frutigen and Zürich (Kreis 3) has been calculated here.
Air line (approximately)
107 kilometers
58 nautical miles