The calculated distance (air line) between Garðabær and Ísafjörður is approximately 142 miles respectively 228 kilometers.
By car or train, the actual journey to Ísafjörður is certainly longer, as only the direct route (as the crow flies) between Garðabær and Ísafjörður has been calculated here.
Air line (approximately)
228 kilometers
123 nautical miles