| Krefeld to Karlovo | 1,043.99 mi (1,680.15 km) |
| Krefeld to Karnobat | 1,128.85 mi (1,816.71 km) |
| Krefeld to Kavarna | 1,149.18 mi (1,849.43 km) |
| Krefeld to Kazanlak | 1,067.93 mi (1,718.66 km) |
| Krefeld to Knezha | 977.76 mi (1,573.55 km) |
| Krefeld to Kostinbrod | 976.07 mi (1,570.84 km) |
| Krefeld to Kozloduy | 951.81 mi (1,531.78 km) |
| Krefeld to Kyustendil | 982.10 mi (1,580.53 km) |
| Krefeld to Levski | 1,024.34 mi (1,648.52 km) |
| Krefeld to Lom | 930.86 mi (1,498.08 km) |
| Krefeld to Lovech | 1,018.40 mi (1,638.95 km) |
| Krefeld to Lukovit | 994.32 mi (1,600.21 km) |
| Krefeld to Lyaskovets | 1,058.76 mi (1,703.91 km) |
| Krefeld to Mezdra | 978.80 mi (1,575.23 km) |
| Krefeld to Momchilgrad | 1,118.88 mi (1,800.66 km) |
