| Isselburg to Karlovo | 1,064.33 mi (1,712.88 km) |
| Isselburg to Karnobat | 1,147.26 mi (1,846.34 km) |
| Isselburg to Kavarna | 1,165.31 mi (1,875.38 km) |
| Isselburg to Kazanlak | 1,087.76 mi (1,750.58 km) |
| Isselburg to Knezha | 997.53 mi (1,605.36 km) |
| Isselburg to Kostinbrod | 997.68 mi (1,605.61 km) |
| Isselburg to Kozloduy | 971.47 mi (1,563.42 km) |
| Isselburg to Kyustendil | 1,004.94 mi (1,617.30 km) |
| Isselburg to Levski | 1,043.33 mi (1,679.08 km) |
| Isselburg to Lom | 950.94 mi (1,530.39 km) |
| Isselburg to Lovech | 1,038.11 mi (1,670.68 km) |
| Isselburg to Lukovit | 1,014.46 mi (1,632.62 km) |
| Isselburg to Lyaskovets | 1,077.61 mi (1,734.25 km) |
| Isselburg to Mezdra | 999.46 mi (1,608.48 km) |
| Isselburg to Momchilgrad | 1,140.11 mi (1,834.83 km) |
