The calculated distance (air line) between Kızılcahamam and Eskişehir is approximately 122 miles respectively 197 kilometers.
By car or train, the actual journey to Eskişehir is certainly longer, as only the direct route (as the crow flies) between Kızılcahamam and Eskişehir has been calculated here.
Air line (approximately)
197 kilometers
106 nautical miles