| Grevenbroich to Popovo | 1,060.90 mi (1,707.36 km) |
| Grevenbroich to Provadia | 1,116.14 mi (1,796.25 km) |
| Grevenbroich to Radnevo | 1,094.44 mi (1,761.32 km) |
| Grevenbroich to Radomir | 969.27 mi (1,559.89 km) |
| Grevenbroich to Rakitovo | 1,038.32 mi (1,671.01 km) |
| Grevenbroich to Rakovski | 1,057.55 mi (1,701.96 km) |
| Grevenbroich to Razgrad | 1,064.73 mi (1,713.52 km) |
| Grevenbroich to Razlog | 1,020.21 mi (1,641.88 km) |
| Grevenbroich to Ruse | 1,030.21 mi (1,657.96 km) |
| Grevenbroich to Samokov | 1,001.87 mi (1,612.36 km) |
| Grevenbroich to Sandanski | 1,028.83 mi (1,655.75 km) |
| Grevenbroich to Sevlievo | 1,030.35 mi (1,658.18 km) |
| Grevenbroich to Shumen | 1,091.81 mi (1,757.10 km) |
| Grevenbroich to Silistra | 1,071.82 mi (1,724.93 km) |
| Grevenbroich to Sliven | 1,093.25 mi (1,759.41 km) |
