| Castle Pines to Karlovo | 5,949.10 mi (9,574.15 km) |
| Castle Pines to Karnobat | 6,014.46 mi (9,679.34 km) |
| Castle Pines to Kavarna | 6,007.88 mi (9,668.75 km) |
| Castle Pines to Kazanlak | 5,968.46 mi (9,605.31 km) |
| Castle Pines to Knezha | 5,879.83 mi (9,462.68 km) |
| Castle Pines to Kostinbrod | 5,890.91 mi (9,480.50 km) |
| Castle Pines to Kozloduy | 5,853.66 mi (9,420.56 km) |
| Castle Pines to Kyustendil | 5,903.44 mi (9,500.67 km) |
| Castle Pines to Levski | 5,918.71 mi (9,525.25 km) |
| Castle Pines to Lom | 5,836.31 mi (9,392.63 km) |
| Castle Pines to Lovech | 5,919.14 mi (9,525.93 km) |
| Castle Pines to Lukovit | 5,898.91 mi (9,493.37 km) |
| Castle Pines to Lyaskovets | 5,950.92 mi (9,577.08 km) |
| Castle Pines to Mezdra | 5,887.46 mi (9,474.96 km) |
| Castle Pines to Momchilgrad | 6,029.41 mi (9,703.40 km) |
