| Watford to Glyka Nera | 1,505.24 mi (2,422.45 km) |
| Watford to Grevena | 1,311.00 mi (2,109.85 km) |
| Watford to Ialysos | 1,747.43 mi (2,812.21 km) |
| Watford to Ilion | 1,497.61 mi (2,410.17 km) |
| Watford to Ilioupoli | 1,504.51 mi (2,421.27 km) |
| Watford to Ioannina | 1,310.40 mi (2,108.89 km) |
| Watford to Irakleio | 1,689.36 mi (2,718.77 km) |
| Watford to Irakleio | 1,499.26 mi (2,412.83 km) |
| Watford to Kaisariani | 1,503.05 mi (2,418.93 km) |
| Watford to Kalamaria | 1,345.28 mi (2,165.01 km) |
| Watford to Kalamata | 1,490.93 mi (2,399.42 km) |
| Watford to Kallithea | 1,501.80 mi (2,416.92 km) |
| Watford to Kalymnos | 1,674.11 mi (2,694.21 km) |
| Watford to Kalyvia Thorikou | 1,515.77 mi (2,439.39 km) |
| Watford to Kamatero | 1,496.73 mi (2,408.75 km) |
