| Letchworth to Hoyo de Manzanares | 802.73 mi (1,291.88 km) |
| Letchworth to Huelva | 1,068.80 mi (1,720.07 km) |
| Letchworth to Huercal de Almeria | 1,048.47 mi (1,687.34 km) |
| Letchworth to Huercal-Overa | 1,011.79 mi (1,628.32 km) |
| Letchworth to Huesca | 680.26 mi (1,094.77 km) |
| Letchworth to Huetor Vega | 1,037.31 mi (1,669.39 km) |
| Letchworth to Huetor-Tajar | 1,038.17 mi (1,670.78 km) |
| Letchworth to Humanes de Madrid | 827.91 mi (1,332.40 km) |
| Letchworth to Ibi | 922.60 mi (1,484.78 km) |
| Letchworth to Ibiza | 906.51 mi (1,458.89 km) |
| Letchworth to Icod de los Vinos | 1,839.91 mi (2,961.06 km) |
| Letchworth to Igualada | 723.59 mi (1,164.50 km) |
| Letchworth to Illescas | 837.28 mi (1,347.48 km) |
| Letchworth to Inca | 860.39 mi (1,384.66 km) |
| Letchworth to Ingenio | 1,838.39 mi (2,958.60 km) |
