The calculated distance (air line) between Cherven Bryag and Stara Zagora is approximately 98 miles respectively 158 kilometers.
By car or train, the actual journey to Stara Zagora is certainly longer, as only the direct route (as the crow flies) between Cherven Bryag and Stara Zagora has been calculated here.
Air line (approximately)
158 kilometers
85 nautical miles