| Kalkar to Karlovo | 1,067.68 mi (1,718.26 km) |
| Kalkar to Karnobat | 1,151.22 mi (1,852.71 km) |
| Kalkar to Kavarna | 1,169.94 mi (1,882.83 km) |
| Kalkar to Kazanlak | 1,091.27 mi (1,756.22 km) |
| Kalkar to Knezha | 1,001.05 mi (1,611.03 km) |
| Kalkar to Kostinbrod | 1,000.59 mi (1,610.30 km) |
| Kalkar to Kozloduy | 975.02 mi (1,569.14 km) |
| Kalkar to Kyustendil | 1,007.42 mi (1,621.29 km) |
| Kalkar to Levski | 1,047.10 mi (1,685.15 km) |
| Kalkar to Lom | 954.36 mi (1,535.90 km) |
| Kalkar to Lovech | 1,041.66 mi (1,676.38 km) |
| Kalkar to Lukovit | 1,017.87 mi (1,638.10 km) |
| Kalkar to Lyaskovets | 1,081.43 mi (1,740.40 km) |
| Kalkar to Mezdra | 1,002.70 mi (1,613.68 km) |
| Kalkar to Momchilgrad | 1,143.16 mi (1,839.74 km) |
