| Krefeld to Popovo | 1,068.34 mi (1,719.33 km) |
| Krefeld to Provadia | 1,123.19 mi (1,807.59 km) |
| Krefeld to Radnevo | 1,102.80 mi (1,774.78 km) |
| Krefeld to Radomir | 978.88 mi (1,575.36 km) |
| Krefeld to Rakitovo | 1,047.77 mi (1,686.22 km) |
| Krefeld to Rakovski | 1,066.36 mi (1,716.15 km) |
| Krefeld to Razgrad | 1,071.90 mi (1,725.05 km) |
| Krefeld to Razlog | 1,030.03 mi (1,657.68 km) |
| Krefeld to Ruse | 1,037.39 mi (1,669.51 km) |
| Krefeld to Samokov | 1,011.34 mi (1,627.59 km) |
| Krefeld to Sandanski | 1,038.95 mi (1,672.03 km) |
| Krefeld to Sevlievo | 1,038.55 mi (1,671.38 km) |
| Krefeld to Shumen | 1,099.00 mi (1,768.67 km) |
| Krefeld to Silistra | 1,078.19 mi (1,735.18 km) |
| Krefeld to Sliven | 1,101.15 mi (1,772.14 km) |
