| Castel San Pietro Terme to Karlovo | 672.76 mi (1,082.71 km) |
| Castel San Pietro Terme to Karnobat | 780.00 mi (1,255.30 km) |
| Castel San Pietro Terme to Kavarna | 834.87 mi (1,343.60 km) |
| Castel San Pietro Terme to Kazanlak | 702.37 mi (1,130.35 km) |
| Castel San Pietro Terme to Knezha | 624.28 mi (1,004.68 km) |
| Castel San Pietro Terme to Kostinbrod | 591.66 mi (952.18 km) |
| Castel San Pietro Terme to Kozloduy | 603.89 mi (971.86 km) |
| Castel San Pietro Terme to Kyustendil | 576.12 mi (927.17 km) |
| Castel San Pietro Terme to Levski | 677.76 mi (1,090.75 km) |
| Castel San Pietro Terme to Lom | 579.00 mi (931.81 km) |
| Castel San Pietro Terme to Lovech | 660.40 mi (1,062.82 km) |
| Castel San Pietro Terme to Lukovit | 632.33 mi (1,017.64 km) |
| Castel San Pietro Terme to Lyaskovets | 710.19 mi (1,142.95 km) |
| Castel San Pietro Terme to Mezdra | 610.06 mi (981.79 km) |
| Castel San Pietro Terme to Momchilgrad | 725.89 mi (1,168.21 km) |
