The calculated distance (air line) between Spiez and Zürich (Kreis 4) / Aussersihl is approximately 62 miles respectively 99 kilometers.
By car or train, the actual journey to Zürich (Kreis 4) / Aussersihl is certainly longer, as only the direct route (as the crow flies) between Spiez and Zürich (Kreis 4) / Aussersihl has been calculated here.
Air line (approximately)
99 kilometers
54 nautical miles