| Viljandi to Popovo | 1,037.91 mi (1,670.35 km) |
| Viljandi to Provadia | 1,052.03 mi (1,693.07 km) |
| Viljandi to Radnevo | 1,110.20 mi (1,786.69 km) |
| Viljandi to Radomir | 1,098.81 mi (1,768.37 km) |
| Viljandi to Rakitovo | 1,133.90 mi (1,824.83 km) |
| Viljandi to Rakovski | 1,111.24 mi (1,788.37 km) |
| Viljandi to Razgrad | 1,025.64 mi (1,650.61 km) |
| Viljandi to Razlog | 1,142.66 mi (1,838.94 km) |
| Viljandi to Ruse | 1,004.98 mi (1,617.36 km) |
| Viljandi to Samokov | 1,111.07 mi (1,788.10 km) |
| Viljandi to Sandanski | 1,165.06 mi (1,874.98 km) |
| Viljandi to Sevlievo | 1,060.17 mi (1,706.19 km) |
| Viljandi to Shumen | 1,043.73 mi (1,679.73 km) |
| Viljandi to Silistra | 987.09 mi (1,588.56 km) |
| Viljandi to Sliven | 1,084.08 mi (1,744.66 km) |
