The calculated distance (air line) between Mégara and Palaió Fáliro is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Palaió Fáliro is certainly longer, as only the direct route (as the crow flies) between Mégara and Palaió Fáliro has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles