| Castaic to Karlovo | 6,628.87 mi (10,668.14 km) |
| Castaic to Karnobat | 6,682.73 mi (10,754.81 km) |
| Castaic to Kavarna | 6,665.06 mi (10,726.38 km) |
| Castaic to Kazanlak | 6,645.27 mi (10,694.53 km) |
| Castaic to Knezha | 6,559.37 mi (10,556.28 km) |
| Castaic to Kostinbrod | 6,577.97 mi (10,586.21 km) |
| Castaic to Kozloduy | 6,533.65 mi (10,514.89 km) |
| Castaic to Kyustendil | 6,595.60 mi (10,614.60 km) |
| Castaic to Levski | 6,593.46 mi (10,611.15 km) |
| Castaic to Lom | 6,518.58 mi (10,490.63 km) |
| Castaic to Lovech | 6,597.12 mi (10,617.04 km) |
| Castaic to Lukovit | 6,579.41 mi (10,588.53 km) |
| Castaic to Lyaskovets | 6,623.84 mi (10,660.05 km) |
| Castaic to Mezdra | 6,570.56 mi (10,574.30 km) |
| Castaic to Momchilgrad | 6,711.05 mi (10,800.39 km) |
