The calculated distance (air line) between Si Racha and Phra Phutthabat is approximately 108 miles respectively 173 kilometers.
By car or train, the actual journey to Phra Phutthabat is certainly longer, as only the direct route (as the crow flies) between Si Racha and Phra Phutthabat has been calculated here.
Air line (approximately)
173 kilometers
93 nautical miles