The calculated distance (air line) between Lempäälä and Lappeenranta is approximately 149 miles respectively 240 kilometers.
By car or train, the actual journey to Lappeenranta is certainly longer, as only the direct route (as the crow flies) between Lempäälä and Lappeenranta has been calculated here.
Air line (approximately)
240 kilometers
129 nautical miles