| Harpenden to Karditsa | 1,368.57 mi (2,202.49 km) |
| Harpenden to Kastoria | 1,287.80 mi (2,072.52 km) |
| Harpenden to Katerini | 1,346.34 mi (2,166.73 km) |
| Harpenden to Keratsini | 1,501.85 mi (2,417.00 km) |
| Harpenden to Kerkyra | 1,282.99 mi (2,064.77 km) |
| Harpenden to Kiato | 1,467.81 mi (2,362.21 km) |
| Harpenden to Kifisia | 1,503.36 mi (2,419.42 km) |
| Harpenden to Kilkis | 1,326.57 mi (2,134.91 km) |
| Harpenden to Komotini | 1,421.39 mi (2,287.51 km) |
| Harpenden to Korinthos | 1,477.97 mi (2,378.56 km) |
| Harpenden to Koropi | 1,514.73 mi (2,437.72 km) |
| Harpenden to Korydallos | 1,502.24 mi (2,417.63 km) |
| Harpenden to Kos | 1,693.96 mi (2,726.16 km) |
| Harpenden to Kozani | 1,317.68 mi (2,120.60 km) |
| Harpenden to Lagos | 1,407.31 mi (2,264.85 km) |
