| Difficult Run to Karlovo | 4,991.87 mi (8,033.64 km) |
| Difficult Run to Karnobat | 5,079.97 mi (8,175.42 km) |
| Difficult Run to Kavarna | 5,099.02 mi (8,206.07 km) |
| Difficult Run to Kazanlak | 5,017.01 mi (8,074.10 km) |
| Difficult Run to Knezha | 4,927.23 mi (7,929.60 km) |
| Difficult Run to Kostinbrod | 4,919.89 mi (7,917.80 km) |
| Difficult Run to Kozloduy | 4,901.54 mi (7,888.27 km) |
| Difficult Run to Kyustendil | 4,919.60 mi (7,917.34 km) |
| Difficult Run to Levski | 4,974.98 mi (8,006.46 km) |
| Difficult Run to Lom | 4,879.81 mi (7,853.30 km) |
| Difficult Run to Lovech | 4,967.86 mi (7,994.99 km) |
| Difficult Run to Lukovit | 4,942.91 mi (7,954.84 km) |
| Difficult Run to Lyaskovets | 5,009.52 mi (8,062.04 km) |
| Difficult Run to Mezdra | 4,926.02 mi (7,927.66 km) |
| Difficult Run to Momchilgrad | 5,063.21 mi (8,148.44 km) |
