| Sondershausen to Popovo | 904.75 mi (1,456.06 km) |
| Sondershausen to Provadia | 957.04 mi (1,540.21 km) |
| Sondershausen to Radnevo | 945.20 mi (1,521.15 km) |
| Sondershausen to Radomir | 832.05 mi (1,339.05 km) |
| Sondershausen to Rakitovo | 898.97 mi (1,446.76 km) |
| Sondershausen to Rakovski | 912.34 mi (1,468.27 km) |
| Sondershausen to Razgrad | 906.65 mi (1,459.11 km) |
| Sondershausen to Razlog | 884.58 mi (1,423.59 km) |
| Sondershausen to Ruse | 872.35 mi (1,403.92 km) |
| Sondershausen to Samokov | 862.93 mi (1,388.74 km) |
| Sondershausen to Sandanski | 896.13 mi (1,442.18 km) |
| Sondershausen to Sevlievo | 880.17 mi (1,416.50 km) |
| Sondershausen to Shumen | 933.74 mi (1,502.71 km) |
| Sondershausen to Silistra | 908.48 mi (1,462.06 km) |
| Sondershausen to Sliven | 940.41 mi (1,513.44 km) |
