| Donostia to Karlovo | 1,348.99 mi (2,170.99 km) |
| Donostia to Karnobat | 1,457.53 mi (2,345.66 km) |
| Donostia to Kavarna | 1,513.89 mi (2,436.37 km) |
| Donostia to Kazanlak | 1,378.91 mi (2,219.14 km) |
| Donostia to Knezha | 1,302.88 mi (2,096.78 km) |
| Donostia to Kostinbrod | 1,267.45 mi (2,039.77 km) |
| Donostia to Kozloduy | 1,282.82 mi (2,064.50 km) |
| Donostia to Kyustendil | 1,247.79 mi (2,008.13 km) |
| Donostia to Levski | 1,356.35 mi (2,182.84 km) |
| Donostia to Lom | 1,257.92 mi (2,024.43 km) |
| Donostia to Lovech | 1,338.35 mi (2,153.86 km) |
| Donostia to Lukovit | 1,310.24 mi (2,108.63 km) |
| Donostia to Lyaskovets | 1,388.41 mi (2,234.43 km) |
| Donostia to Mezdra | 1,287.61 mi (2,072.20 km) |
| Donostia to Momchilgrad | 1,396.39 mi (2,247.27 km) |
