The calculated distance (air line) between Khon Kaen and Phra Phutthabat is approximately 180 miles respectively 290 kilometers.
By car or train, the actual journey to Phra Phutthabat is certainly longer, as only the direct route (as the crow flies) between Khon Kaen and Phra Phutthabat has been calculated here.
Air line (approximately)
290 kilometers
157 nautical miles