| Castano Primo to Karlovo | 819.34 mi (1,318.59 km) |
| Castano Primo to Karnobat | 924.01 mi (1,487.05 km) |
| Castano Primo to Kavarna | 972.92 mi (1,565.77 km) |
| Castano Primo to Kazanlak | 848.35 mi (1,365.29 km) |
| Castano Primo to Knezha | 766.43 mi (1,233.45 km) |
| Castano Primo to Kostinbrod | 739.31 mi (1,189.80 km) |
| Castano Primo to Kozloduy | 744.38 mi (1,197.97 km) |
| Castano Primo to Kyustendil | 727.38 mi (1,170.60 km) |
| Castano Primo to Levski | 819.60 mi (1,319.01 km) |
| Castano Primo to Lom | 719.72 mi (1,158.28 km) |
| Castano Primo to Lovech | 804.21 mi (1,294.25 km) |
| Castano Primo to Lukovit | 776.39 mi (1,249.48 km) |
| Castano Primo to Lyaskovets | 853.03 mi (1,372.83 km) |
| Castano Primo to Mezdra | 755.02 mi (1,215.09 km) |
| Castano Primo to Momchilgrad | 876.94 mi (1,411.30 km) |
