| Alsdorf to Popovo | 1,072.60 mi (1,726.19 km) |
| Alsdorf to Provadia | 1,128.32 mi (1,815.86 km) |
| Alsdorf to Radnevo | 1,104.87 mi (1,778.12 km) |
| Alsdorf to Radomir | 977.92 mi (1,573.80 km) |
| Alsdorf to Rakitovo | 1,047.19 mi (1,685.28 km) |
| Alsdorf to Rakovski | 1,067.35 mi (1,717.73 km) |
| Alsdorf to Razgrad | 1,076.78 mi (1,732.91 km) |
| Alsdorf to Razlog | 1,028.52 mi (1,655.24 km) |
| Alsdorf to Ruse | 1,042.26 mi (1,677.35 km) |
| Alsdorf to Samokov | 1,010.74 mi (1,626.62 km) |
| Alsdorf to Sandanski | 1,036.67 mi (1,668.35 km) |
| Alsdorf to Sevlievo | 1,041.03 mi (1,675.37 km) |
| Alsdorf to Shumen | 1,103.83 mi (1,776.44 km) |
| Alsdorf to Silistra | 1,084.86 mi (1,745.92 km) |
| Alsdorf to Sliven | 1,104.32 mi (1,777.23 km) |
