The calculated distance (air line) between Ísafjörður and Kópavogur is approximately 140 miles respectively 226 kilometers.
By car or train, the actual journey to Kópavogur is certainly longer, as only the direct route (as the crow flies) between Ísafjörður and Kópavogur has been calculated here.
Air line (approximately)
226 kilometers
122 nautical miles