| Castlebar to Karlovo | 1,727.57 mi (2,780.26 km) |
| Castlebar to Karnobat | 1,814.90 mi (2,920.81 km) |
| Castlebar to Kavarna | 1,835.85 mi (2,954.51 km) |
| Castlebar to Kazanlak | 1,752.32 mi (2,820.09 km) |
| Castlebar to Knezha | 1,662.39 mi (2,675.36 km) |
| Castlebar to Kostinbrod | 1,657.04 mi (2,666.75 km) |
| Castlebar to Kozloduy | 1,636.63 mi (2,633.91 km) |
| Castlebar to Kyustendil | 1,659.38 mi (2,670.52 km) |
| Castlebar to Levski | 1,709.91 mi (2,751.84 km) |
| Castlebar to Lom | 1,615.10 mi (2,599.26 km) |
| Castlebar to Lovech | 1,703.04 mi (2,740.78 km) |
| Castlebar to Lukovit | 1,678.34 mi (2,701.03 km) |
| Castlebar to Lyaskovets | 1,744.44 mi (2,807.41 km) |
| Castlebar to Mezdra | 1,661.90 mi (2,674.57 km) |
| Castlebar to Momchilgrad | 1,800.37 mi (2,897.41 km) |
