The calculated distance (air line) between Modena and Reggio nell'Emilia is approximately 15 miles respectively 24 kilometers.
By car or train, the actual journey to Reggio nell'Emilia is certainly longer, as only the direct route (as the crow flies) between Modena and Reggio nell'Emilia has been calculated here.
Air line (approximately)
24 kilometers
13 nautical miles