| Greenford to Hoyo de Manzanares | 771.46 mi (1,241.55 km) |
| Greenford to Huelva | 1,038.03 mi (1,670.54 km) |
| Greenford to Huercal de Almeria | 1,017.12 mi (1,636.90 km) |
| Greenford to Huercal-Overa | 980.49 mi (1,577.95 km) |
| Greenford to Huesca | 649.25 mi (1,044.87 km) |
| Greenford to Huetor Vega | 1,005.94 mi (1,618.91 km) |
| Greenford to Huetor-Tajar | 1,006.83 mi (1,620.33 km) |
| Greenford to Humanes de Madrid | 796.62 mi (1,282.03 km) |
| Greenford to Ibi | 891.56 mi (1,434.82 km) |
| Greenford to Ibiza | 876.26 mi (1,410.20 km) |
| Greenford to Icod de los Vinos | 1,811.40 mi (2,915.16 km) |
| Greenford to Igualada | 693.65 mi (1,116.32 km) |
| Greenford to Illescas | 805.98 mi (1,297.10 km) |
| Greenford to Inca | 831.10 mi (1,337.53 km) |
| Greenford to Ingenio | 1,809.29 mi (2,911.77 km) |
