| Donostia to Karditsa | 1,264.66 mi (2,035.28 km) |
| Donostia to Kastoria | 1,206.71 mi (1,942.01 km) |
| Donostia to Katerini | 1,273.81 mi (2,050.01 km) |
| Donostia to Keratsini | 1,385.86 mi (2,230.32 km) |
| Donostia to Kerkyra | 1,158.63 mi (1,864.63 km) |
| Donostia to Kiato | 1,341.38 mi (2,158.75 km) |
| Donostia to Kifisia | 1,392.65 mi (2,241.25 km) |
| Donostia to Kilkis | 1,278.14 mi (2,056.97 km) |
| Donostia to Komotini | 1,404.07 mi (2,259.63 km) |
| Donostia to Korinthos | 1,352.24 mi (2,176.23 km) |
| Donostia to Koropi | 1,400.52 mi (2,253.91 km) |
| Donostia to Korydallos | 1,387.06 mi (2,232.26 km) |
| Donostia to Kos | 1,598.46 mi (2,572.47 km) |
| Donostia to Kozani | 1,237.10 mi (1,990.93 km) |
| Donostia to Lagos | 1,385.02 mi (2,228.97 km) |
