| Castel Bolognese to Karlovo | 661.54 mi (1,064.65 km) |
| Castel Bolognese to Karnobat | 768.97 mi (1,237.53 km) |
| Castel Bolognese to Kavarna | 824.31 mi (1,326.61 km) |
| Castel Bolognese to Kazanlak | 691.19 mi (1,112.36 km) |
| Castel Bolognese to Knezha | 613.46 mi (987.27 km) |
| Castel Bolognese to Kostinbrod | 580.37 mi (934.02 km) |
| Castel Bolognese to Kozloduy | 593.22 mi (954.70 km) |
| Castel Bolognese to Kyustendil | 564.53 mi (908.52 km) |
| Castel Bolognese to Levski | 666.94 mi (1,073.34 km) |
| Castel Bolognese to Lom | 568.33 mi (914.64 km) |
| Castel Bolognese to Lovech | 649.42 mi (1,045.15 km) |
| Castel Bolognese to Lukovit | 621.34 mi (999.95 km) |
| Castel Bolognese to Lyaskovets | 699.28 mi (1,125.38 km) |
| Castel Bolognese to Mezdra | 599.00 mi (964.00 km) |
| Castel Bolognese to Momchilgrad | 714.29 mi (1,149.54 km) |
