The calculated distance (air line) between Sivrihisar and Ataşehir is approximately 166 miles respectively 267 kilometers.
By car or train, the actual journey to Ataşehir is certainly longer, as only the direct route (as the crow flies) between Sivrihisar and Ataşehir has been calculated here.
Air line (approximately)
267 kilometers
144 nautical miles