The calculated distance (air line) between Ylöjärvi and Lappeenranta is approximately 156 miles respectively 251 kilometers.
By car or train, the actual journey to Lappeenranta is certainly longer, as only the direct route (as the crow flies) between Ylöjärvi and Lappeenranta has been calculated here.
Air line (approximately)
251 kilometers
136 nautical miles