The calculated distance (air line) between Ad Darbāsīyah and Deir ez-Zor is approximately 123 miles respectively 199 kilometers.
By car or train, the actual journey to Deir ez-Zor is certainly longer, as only the direct route (as the crow flies) between Ad Darbāsīyah and Deir ez-Zor has been calculated here.
Air line (approximately)
199 kilometers
107 nautical miles