The calculated distance (air line) between Lávrio and Palaió Fáliro is approximately 24 miles respectively 39 kilometers.
By car or train, the actual journey to Palaió Fáliro is certainly longer, as only the direct route (as the crow flies) between Lávrio and Palaió Fáliro has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles