| Union to Karlovo | 5,540.52 mi (8,916.61 km) |
| Union to Karnobat | 5,619.31 mi (9,043.40 km) |
| Union to Kavarna | 5,626.97 mi (9,055.73 km) |
| Union to Kazanlak | 5,563.33 mi (8,953.31 km) |
| Union to Knezha | 5,473.13 mi (8,808.14 km) |
| Union to Kostinbrod | 5,474.00 mi (8,809.56 km) |
| Union to Kozloduy | 5,446.95 mi (8,766.02 km) |
| Union to Kyustendil | 5,479.46 mi (8,818.35 km) |
| Union to Levski | 5,517.38 mi (8,879.36 km) |
| Union to Lom | 5,426.97 mi (8,733.87 km) |
| Union to Lovech | 5,513.58 mi (8,873.25 km) |
| Union to Lukovit | 5,490.50 mi (8,836.10 km) |
| Union to Lyaskovets | 5,551.23 mi (8,933.83 km) |
| Union to Mezdra | 5,475.89 mi (8,812.59 km) |
| Union to Momchilgrad | 5,616.61 mi (9,039.06 km) |
