| Boucau to Karlovo | 1,322.73 mi (2,128.73 km) |
| Boucau to Karnobat | 1,431.09 mi (2,303.12 km) |
| Boucau to Kavarna | 1,486.99 mi (2,393.08 km) |
| Boucau to Kazanlak | 1,352.61 mi (2,176.82 km) |
| Boucau to Knezha | 1,276.19 mi (2,053.83 km) |
| Boucau to Kostinbrod | 1,241.22 mi (1,997.55 km) |
| Boucau to Kozloduy | 1,256.00 mi (2,021.34 km) |
| Boucau to Kyustendil | 1,221.95 mi (1,966.54 km) |
| Boucau to Levski | 1,329.67 mi (2,139.90 km) |
| Boucau to Lom | 1,231.11 mi (1,981.28 km) |
| Boucau to Lovech | 1,311.82 mi (2,111.17 km) |
| Boucau to Lukovit | 1,283.72 mi (2,065.94 km) |
| Boucau to Lyaskovets | 1,361.83 mi (2,191.65 km) |
| Boucau to Mezdra | 1,261.14 mi (2,029.61 km) |
| Boucau to Momchilgrad | 1,370.72 mi (2,205.96 km) |
