| Siegburg to Popovo | 1,028.49 mi (1,655.19 km) |
| Siegburg to Provadia | 1,083.94 mi (1,744.43 km) |
| Siegburg to Radnevo | 1,061.58 mi (1,708.45 km) |
| Siegburg to Radomir | 936.03 mi (1,506.39 km) |
| Siegburg to Rakitovo | 1,005.11 mi (1,617.57 km) |
| Siegburg to Rakovski | 1,024.53 mi (1,648.81 km) |
| Siegburg to Razgrad | 1,032.46 mi (1,661.59 km) |
| Siegburg to Razlog | 986.93 mi (1,588.31 km) |
| Siegburg to Ruse | 997.94 mi (1,606.03 km) |
| Siegburg to Samokov | 968.66 mi (1,558.91 km) |
| Siegburg to Sandanski | 995.50 mi (1,602.10 km) |
| Siegburg to Sevlievo | 997.57 mi (1,605.43 km) |
| Siegburg to Shumen | 1,059.54 mi (1,705.16 km) |
| Siegburg to Silistra | 1,040.05 mi (1,673.79 km) |
| Siegburg to Sliven | 1,060.60 mi (1,706.87 km) |
