| Castricum to Karlovo | 1,155.01 mi (1,858.80 km) |
| Castricum to Karnobat | 1,237.32 mi (1,991.27 km) |
| Castricum to Kavarna | 1,254.22 mi (2,018.47 km) |
| Castricum to Kazanlak | 1,178.30 mi (1,896.29 km) |
| Castricum to Knezha | 1,088.07 mi (1,751.07 km) |
| Castricum to Kostinbrod | 1,088.56 mi (1,751.86 km) |
| Castricum to Kozloduy | 1,061.98 mi (1,709.09 km) |
| Castricum to Kyustendil | 1,095.85 mi (1,763.59 km) |
| Castricum to Levski | 1,133.62 mi (1,824.39 km) |
| Castricum to Lom | 1,041.57 mi (1,676.24 km) |
| Castricum to Lovech | 1,128.64 mi (1,816.36 km) |
| Castricum to Lukovit | 1,105.09 mi (1,778.48 km) |
| Castricum to Lyaskovets | 1,167.85 mi (1,879.48 km) |
| Castricum to Mezdra | 1,090.21 mi (1,754.52 km) |
| Castricum to Momchilgrad | 1,230.94 mi (1,981.00 km) |
