| Horb am Neckar to Popovo | 911.38 mi (1,466.73 km) |
| Horb am Neckar to Provadia | 969.88 mi (1,560.88 km) |
| Horb am Neckar to Radnevo | 935.55 mi (1,505.62 km) |
| Horb am Neckar to Radomir | 799.88 mi (1,287.28 km) |
| Horb am Neckar to Rakitovo | 869.78 mi (1,399.78 km) |
| Horb am Neckar to Rakovski | 894.70 mi (1,439.88 km) |
| Horb am Neckar to Razgrad | 917.88 mi (1,477.18 km) |
| Horb am Neckar to Razlog | 848.50 mi (1,365.53 km) |
| Horb am Neckar to Ruse | 883.68 mi (1,422.15 km) |
| Horb am Neckar to Samokov | 833.55 mi (1,341.47 km) |
| Horb am Neckar to Sandanski | 854.42 mi (1,375.06 km) |
| Horb am Neckar to Sevlievo | 873.66 mi (1,406.02 km) |
| Horb am Neckar to Shumen | 944.47 mi (1,519.98 km) |
| Horb am Neckar to Silistra | 933.01 mi (1,501.53 km) |
| Horb am Neckar to Sliven | 938.79 mi (1,510.83 km) |
