| Boo to Karlovo | 1,185.41 mi (1,907.73 km) |
| Boo to Karnobat | 1,211.29 mi (1,949.38 km) |
| Boo to Kavarna | 1,177.40 mi (1,894.83 km) |
| Boo to Kazanlak | 1,193.43 mi (1,920.64 km) |
| Boo to Knezha | 1,120.33 mi (1,803.00 km) |
| Boo to Kostinbrod | 1,159.47 mi (1,865.99 km) |
| Boo to Kozloduy | 1,097.90 mi (1,766.90 km) |
| Boo to Kyustendil | 1,192.06 mi (1,918.44 km) |
| Boo to Levski | 1,139.92 mi (1,834.53 km) |
| Boo to Lom | 1,090.80 mi (1,755.47 km) |
| Boo to Lovech | 1,151.25 mi (1,852.76 km) |
| Boo to Lukovit | 1,141.48 mi (1,837.03 km) |
| Boo to Lyaskovets | 1,164.41 mi (1,873.94 km) |
| Boo to Mezdra | 1,140.69 mi (1,835.77 km) |
| Boo to Momchilgrad | 1,266.82 mi (2,038.76 km) |
