The calculated distance (air line) between Sumusţā as Sulţānī and Ismailia is approximately 144 miles respectively 233 kilometers.
By car or train, the actual journey to Ismailia is certainly longer, as only the direct route (as the crow flies) between Sumusţā as Sulţānī and Ismailia has been calculated here.
Air line (approximately)
233 kilometers
125 nautical miles