| Longmont to Karlovo | 5,915.82 mi (9,520.58 km) |
| Longmont to Karnobat | 5,980.33 mi (9,624.42 km) |
| Longmont to Kavarna | 5,972.94 mi (9,612.52 km) |
| Longmont to Kazanlak | 5,934.96 mi (9,551.39 km) |
| Longmont to Knezha | 5,846.49 mi (9,409.02 km) |
| Longmont to Kostinbrod | 5,858.17 mi (9,427.82 km) |
| Longmont to Kozloduy | 5,820.34 mi (9,366.94 km) |
| Longmont to Kyustendil | 5,871.14 mi (9,448.69 km) |
| Longmont to Levski | 5,885.02 mi (9,471.03 km) |
| Longmont to Lom | 5,803.16 mi (9,339.28 km) |
| Longmont to Lovech | 5,885.70 mi (9,472.12 km) |
| Longmont to Lukovit | 5,865.65 mi (9,439.85 km) |
| Longmont to Lyaskovets | 5,917.11 mi (9,522.67 km) |
| Longmont to Mezdra | 5,854.41 mi (9,421.76 km) |
| Longmont to Momchilgrad | 5,996.32 mi (9,650.14 km) |
