| Grefrath to Grevena | 1,060.89 mi (1,707.34 km) |
| Grefrath to Ialysos | 1,486.73 mi (2,392.66 km) |
| Grefrath to Ilion | 1,247.55 mi (2,007.74 km) |
| Grefrath to Ilioupoli | 1,254.71 mi (2,019.26 km) |
| Grefrath to Ioannina | 1,065.81 mi (1,715.25 km) |
| Grefrath to Irakleio | 1,445.09 mi (2,325.65 km) |
| Grefrath to Irakleio | 1,248.82 mi (2,009.77 km) |
| Grefrath to Kaisariani | 1,253.05 mi (2,016.59 km) |
| Grefrath to Kalamaria | 1,085.46 mi (1,746.88 km) |
| Grefrath to Kalamata | 1,253.96 mi (2,018.06 km) |
| Grefrath to Kallithea | 1,252.15 mi (2,015.15 km) |
| Grefrath to Kalymnos | 1,415.27 mi (2,277.66 km) |
| Grefrath to Kalyvia Thorikou | 1,265.69 mi (2,036.94 km) |
| Grefrath to Kamatero | 1,246.49 mi (2,006.03 km) |
| Grefrath to Karditsa | 1,116.09 mi (1,796.18 km) |
