| Viljandi to Karlovo | 1,086.90 mi (1,749.20 km) |
| Viljandi to Karnobat | 1,088.71 mi (1,752.11 km) |
| Viljandi to Kavarna | 1,038.43 mi (1,671.20 km) |
| Viljandi to Kazanlak | 1,088.25 mi (1,751.38 km) |
| Viljandi to Knezha | 1,029.24 mi (1,656.41 km) |
| Viljandi to Kostinbrod | 1,079.30 mi (1,736.97 km) |
| Viljandi to Kozloduy | 1,010.77 mi (1,626.68 km) |
| Viljandi to Kyustendil | 1,118.42 mi (1,799.92 km) |
| Viljandi to Levski | 1,036.59 mi (1,668.24 km) |
| Viljandi to Lom | 1,009.75 mi (1,625.04 km) |
| Viljandi to Lovech | 1,053.11 mi (1,694.82 km) |
| Viljandi to Lukovit | 1,049.73 mi (1,689.37 km) |
| Viljandi to Lyaskovets | 1,054.84 mi (1,697.60 km) |
| Viljandi to Mezdra | 1,054.54 mi (1,697.12 km) |
| Viljandi to Momchilgrad | 1,163.10 mi (1,871.83 km) |
