The calculated distance (air line) between Kham Sakae Saeng and Si Racha is approximately 171 miles respectively 275 kilometers.
By car or train, the actual journey to Si Racha is certainly longer, as only the direct route (as the crow flies) between Kham Sakae Saeng and Si Racha has been calculated here.
Air line (approximately)
275 kilometers
148 nautical miles