The calculated distance (air line) between Jarash and Umm as Summāq is approximately 27 miles respectively 44 kilometers.
By car or train, the actual journey to Umm as Summāq is certainly longer, as only the direct route (as the crow flies) between Jarash and Umm as Summāq has been calculated here.
Air line (approximately)
44 kilometers
24 nautical miles