| Longford to Karlovo | 1,665.91 mi (2,681.02 km) |
| Longford to Karnobat | 1,753.09 mi (2,821.32 km) |
| Longford to Kavarna | 1,773.98 mi (2,854.94 km) |
| Longford to Kazanlak | 1,690.61 mi (2,720.78 km) |
| Longford to Knezha | 1,600.66 mi (2,576.02 km) |
| Longford to Kostinbrod | 1,595.53 mi (2,567.76 km) |
| Longford to Kozloduy | 1,574.89 mi (2,534.54 km) |
| Longford to Kyustendil | 1,598.09 mi (2,571.88 km) |
| Longford to Levski | 1,648.13 mi (2,652.40 km) |
| Longford to Lom | 1,553.39 mi (2,499.95 km) |
| Longford to Lovech | 1,641.31 mi (2,641.43 km) |
| Longford to Lukovit | 1,616.65 mi (2,601.74 km) |
| Longford to Lyaskovets | 1,682.65 mi (2,707.96 km) |
| Longford to Mezdra | 1,600.26 mi (2,575.37 km) |
| Longford to Momchilgrad | 1,738.84 mi (2,798.39 km) |
