| Grefrath to Kastoria | 1,032.22 mi (1,661.20 km) |
| Grefrath to Katerini | 1,086.68 mi (1,748.84 km) |
| Grefrath to Keratsini | 1,248.51 mi (2,009.29 km) |
| Grefrath to Kerkyra | 1,039.47 mi (1,672.87 km) |
| Grefrath to Kiato | 1,218.20 mi (1,960.50 km) |
| Grefrath to Kifisia | 1,248.62 mi (2,009.47 km) |
| Grefrath to Kilkis | 1,061.92 mi (1,709.00 km) |
| Grefrath to Komotini | 1,148.22 mi (1,847.89 km) |
| Grefrath to Korinthos | 1,227.87 mi (1,976.06 km) |
| Grefrath to Koropi | 1,260.59 mi (2,028.72 km) |
| Grefrath to Korydallos | 1,248.68 mi (2,009.56 km) |
| Grefrath to Kos | 1,431.42 mi (2,303.65 km) |
| Grefrath to Kozani | 1,060.92 mi (1,707.38 km) |
| Grefrath to Lagos | 1,135.34 mi (1,827.16 km) |
| Grefrath to Lamia | 1,158.51 mi (1,864.44 km) |
