The calculated distance (air line) between Lan Sak and Phra Pradaeng is approximately 140 miles respectively 225 kilometers.
By car or train, the actual journey to Phra Pradaeng is certainly longer, as only the direct route (as the crow flies) between Lan Sak and Phra Pradaeng has been calculated here.
Air line (approximately)
225 kilometers
121 nautical miles