The calculated distance (air line) between Ísafjörður and Reykjanesbær is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Reykjanesbær is certainly longer, as only the direct route (as the crow flies) between Ísafjörður and Reykjanesbær has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles