| Boom to Karnobat | 1,210.62 mi (1,948.31 km) |
| Boom to Kavarna | 1,234.51 mi (1,986.76 km) |
| Boom to Kazanlak | 1,147.25 mi (1,846.32 km) |
| Boom to Knezha | 1,057.40 mi (1,701.72 km) |
| Boom to Kostinbrod | 1,052.03 mi (1,693.08 km) |
| Boom to Kozloduy | 1,031.71 mi (1,660.37 km) |
| Boom to Kyustendil | 1,055.26 mi (1,698.28 km) |
| Boom to Levski | 1,105.30 mi (1,778.81 km) |
| Boom to Lom | 1,010.03 mi (1,625.49 km) |
| Boom to Lovech | 1,098.04 mi (1,767.12 km) |
| Boom to Lukovit | 1,073.22 mi (1,727.18 km) |
| Boom to Lyaskovets | 1,139.88 mi (1,834.46 km) |
| Boom to Mezdra | 1,056.71 mi (1,700.62 km) |
| Boom to Momchilgrad | 1,195.32 mi (1,923.68 km) |
| Boom to Montana | 1,026.80 mi (1,652.47 km) |
