| Slough to Glyka Nera | 1,507.55 mi (2,426.17 km) |
| Slough to Grevena | 1,313.40 mi (2,113.71 km) |
| Slough to Ialysos | 1,750.51 mi (2,817.17 km) |
| Slough to Ilion | 1,499.89 mi (2,413.84 km) |
| Slough to Ilioupoli | 1,506.76 mi (2,424.90 km) |
| Slough to Ioannina | 1,312.38 mi (2,112.07 km) |
| Slough to Irakleio | 1,691.10 mi (2,721.56 km) |
| Slough to Irakleio | 1,501.57 mi (2,416.54 km) |
| Slough to Kaisariani | 1,505.33 mi (2,422.59 km) |
| Slough to Kalamaria | 1,348.46 mi (2,170.13 km) |
| Slough to Kalamata | 1,492.23 mi (2,401.51 km) |
| Slough to Kallithea | 1,504.05 mi (2,420.53 km) |
| Slough to Kalymnos | 1,677.05 mi (2,698.94 km) |
| Slough to Kalyvia Thorikou | 1,518.04 mi (2,443.04 km) |
| Slough to Kamatero | 1,499.02 mi (2,412.45 km) |
