| Letchworth to Karlovo | 1,328.92 mi (2,138.69 km) |
| Letchworth to Karnobat | 1,417.59 mi (2,281.38 km) |
| Letchworth to Kavarna | 1,441.22 mi (2,319.42 km) |
| Letchworth to Kazanlak | 1,353.94 mi (2,178.96 km) |
| Letchworth to Knezha | 1,264.17 mi (2,034.48 km) |
| Letchworth to Kostinbrod | 1,257.95 mi (2,024.47 km) |
| Letchworth to Kozloduy | 1,238.52 mi (1,993.20 km) |
| Letchworth to Kyustendil | 1,260.16 mi (2,028.04 km) |
| Letchworth to Levski | 1,312.22 mi (2,111.81 km) |
| Letchworth to Lom | 1,216.74 mi (1,958.15 km) |
| Letchworth to Lovech | 1,304.79 mi (2,099.86 km) |
| Letchworth to Lukovit | 1,279.85 mi (2,059.73 km) |
| Letchworth to Lyaskovets | 1,346.81 mi (2,167.48 km) |
| Letchworth to Mezdra | 1,263.15 mi (2,032.85 km) |
| Letchworth to Momchilgrad | 1,401.29 mi (2,255.15 km) |
