| Letchworth to Karditsa | 1,369.69 mi (2,204.30 km) |
| Letchworth to Kastoria | 1,288.64 mi (2,073.86 km) |
| Letchworth to Katerini | 1,346.86 mi (2,167.56 km) |
| Letchworth to Keratsini | 1,502.97 mi (2,418.79 km) |
| Letchworth to Kerkyra | 1,284.73 mi (2,067.57 km) |
| Letchworth to Kiato | 1,469.20 mi (2,364.44 km) |
| Letchworth to Kifisia | 1,504.36 mi (2,421.03 km) |
| Letchworth to Kilkis | 1,326.63 mi (2,135.01 km) |
| Letchworth to Komotini | 1,420.60 mi (2,286.23 km) |
| Letchworth to Korinthos | 1,479.33 mi (2,380.75 km) |
| Letchworth to Koropi | 1,515.78 mi (2,439.42 km) |
| Letchworth to Korydallos | 1,503.34 mi (2,419.39 km) |
| Letchworth to Kos | 1,694.34 mi (2,726.77 km) |
| Letchworth to Kozani | 1,318.43 mi (2,121.81 km) |
| Letchworth to Lagos | 1,406.65 mi (2,263.79 km) |
