| Billdal to Karlovo | 1,174.85 mi (1,890.73 km) |
| Billdal to Karnobat | 1,223.45 mi (1,968.94 km) |
| Billdal to Kavarna | 1,207.77 mi (1,943.71 km) |
| Billdal to Kazanlak | 1,189.05 mi (1,913.59 km) |
| Billdal to Knezha | 1,105.91 mi (1,779.79 km) |
| Billdal to Kostinbrod | 1,132.32 mi (1,822.30 km) |
| Billdal to Kozloduy | 1,080.90 mi (1,739.54 km) |
| Billdal to Kyustendil | 1,156.96 mi (1,861.94 km) |
| Billdal to Levski | 1,136.44 mi (1,828.92 km) |
| Billdal to Lom | 1,068.32 mi (1,719.30 km) |
| Billdal to Lovech | 1,142.06 mi (1,837.97 km) |
| Billdal to Lukovit | 1,126.55 mi (1,813.01 km) |
| Billdal to Lyaskovets | 1,165.83 mi (1,876.22 km) |
| Billdal to Mezdra | 1,120.36 mi (1,803.04 km) |
| Billdal to Momchilgrad | 1,257.65 mi (2,023.99 km) |
