The calculated distance (air line) between Frankfurt am Main and Kynšperk nad Ohří is approximately 170 miles respectively 274 kilometers.
By car or train, the actual journey to Kynšperk nad Ohří is certainly longer, as only the direct route (as the crow flies) between Frankfurt am Main and Kynšperk nad Ohří has been calculated here.
Air line (approximately)
274 kilometers
148 nautical miles