The calculated distance (air line) between Mosfellsbær and Ísafjörður is approximately 138 miles respectively 223 kilometers.
By car or train, the actual journey to Ísafjörður is certainly longer, as only the direct route (as the crow flies) between Mosfellsbær and Ísafjörður has been calculated here.
Air line (approximately)
223 kilometers
120 nautical miles