The calculated distance (air line) between Shizuoka and Fujikawaguchiko is approximately 39 miles respectively 63 kilometers.
By car or train, the actual journey to Fujikawaguchiko is certainly longer, as only the direct route (as the crow flies) between Shizuoka and Fujikawaguchiko has been calculated here.
Air line (approximately)
63 kilometers
34 nautical miles