| Willebroek to Karnobat | 1,210.23 mi (1,947.68 km) |
| Willebroek to Kavarna | 1,234.20 mi (1,986.25 km) |
| Willebroek to Kazanlak | 1,146.81 mi (1,845.62 km) |
| Willebroek to Knezha | 1,056.97 mi (1,701.03 km) |
| Willebroek to Kostinbrod | 1,051.54 mi (1,692.29 km) |
| Willebroek to Kozloduy | 1,031.28 mi (1,659.69 km) |
| Willebroek to Kyustendil | 1,054.73 mi (1,697.42 km) |
| Willebroek to Levski | 1,104.89 mi (1,778.16 km) |
| Willebroek to Lom | 1,009.60 mi (1,624.79 km) |
| Willebroek to Lovech | 1,097.61 mi (1,766.43 km) |
| Willebroek to Lukovit | 1,072.77 mi (1,726.46 km) |
| Willebroek to Lyaskovets | 1,139.48 mi (1,833.81 km) |
| Willebroek to Mezdra | 1,056.25 mi (1,699.88 km) |
| Willebroek to Momchilgrad | 1,194.83 mi (1,922.89 km) |
| Willebroek to Montana | 1,026.34 mi (1,651.73 km) |
