| Heerlen to Karlovo | 1,052.64 mi (1,694.06 km) |
| Heerlen to Karnobat | 1,140.00 mi (1,834.66 km) |
| Heerlen to Kavarna | 1,163.20 mi (1,871.99 km) |
| Heerlen to Kazanlak | 1,077.24 mi (1,733.65 km) |
| Heerlen to Knezha | 987.28 mi (1,588.88 km) |
| Heerlen to Kostinbrod | 983.00 mi (1,581.98 km) |
| Heerlen to Kozloduy | 961.51 mi (1,547.40 km) |
| Heerlen to Kyustendil | 987.17 mi (1,588.70 km) |
| Heerlen to Levski | 1,034.86 mi (1,665.44 km) |
| Heerlen to Lom | 940.03 mi (1,512.83 km) |
| Heerlen to Lovech | 1,027.93 mi (1,654.29 km) |
| Heerlen to Lukovit | 1,003.31 mi (1,614.67 km) |
| Heerlen to Lyaskovets | 1,069.40 mi (1,721.04 km) |
| Heerlen to Mezdra | 987.08 mi (1,588.55 km) |
| Heerlen to Momchilgrad | 1,126.18 mi (1,812.41 km) |
