The calculated distance (air line) between Al Qaşşāşīn and Ismailia is approximately 20 miles respectively 33 kilometers.
By car or train, the actual journey to Ismailia is certainly longer, as only the direct route (as the crow flies) between Al Qaşşāşīn and Ismailia has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles