| Siegen to Popovo | 998.24 mi (1,606.51 km) |
| Siegen to Provadia | 1,053.19 mi (1,694.94 km) |
| Siegen to Radnevo | 1,032.65 mi (1,661.89 km) |
| Siegen to Radomir | 909.16 mi (1,463.14 km) |
| Siegen to Rakitovo | 977.95 mi (1,573.85 km) |
| Siegen to Rakovski | 996.30 mi (1,603.39 km) |
| Siegen to Razgrad | 1,001.86 mi (1,612.34 km) |
| Siegen to Razlog | 960.43 mi (1,545.66 km) |
| Siegen to Ruse | 967.35 mi (1,556.80 km) |
| Siegen to Samokov | 941.52 mi (1,515.23 km) |
| Siegen to Sandanski | 969.56 mi (1,560.35 km) |
| Siegen to Sevlievo | 968.39 mi (1,558.47 km) |
| Siegen to Shumen | 1,028.96 mi (1,655.95 km) |
| Siegen to Silistra | 1,008.48 mi (1,622.99 km) |
| Siegen to Sliven | 1,030.99 mi (1,659.22 km) |
