The calculated distance (air line) between Al Qāhirah al Jadīdah and Damietta is approximately 97 miles respectively 157 kilometers.
By car or train, the actual journey to Damietta is certainly longer, as only the direct route (as the crow flies) between Al Qāhirah al Jadīdah and Damietta has been calculated here.
Air line (approximately)
157 kilometers
85 nautical miles