| Harpenden to Glyka Nera | 1,509.16 mi (2,428.76 km) |
| Harpenden to Grevena | 1,314.87 mi (2,116.07 km) |
| Harpenden to Ialysos | 1,750.69 mi (2,817.46 km) |
| Harpenden to Ilion | 1,501.56 mi (2,416.52 km) |
| Harpenden to Ilioupoli | 1,508.48 mi (2,427.66 km) |
| Harpenden to Ioannina | 1,314.62 mi (2,115.67 km) |
| Harpenden to Irakleio | 1,693.75 mi (2,725.82 km) |
| Harpenden to Irakleio | 1,503.18 mi (2,419.14 km) |
| Harpenden to Kaisariani | 1,507.01 mi (2,425.30 km) |
| Harpenden to Kalamaria | 1,348.48 mi (2,170.16 km) |
| Harpenden to Kalamata | 1,495.68 mi (2,407.06 km) |
| Harpenden to Kallithea | 1,505.78 mi (2,423.32 km) |
| Harpenden to Kalymnos | 1,677.49 mi (2,699.66 km) |
| Harpenden to Kalyvia Thorikou | 1,519.72 mi (2,445.75 km) |
| Harpenden to Kamatero | 1,500.67 mi (2,415.09 km) |
