| Northolt to Hoyo de Manzanares | 772.37 mi (1,243.01 km) |
| Northolt to Huelva | 1,038.79 mi (1,671.77 km) |
| Northolt to Huercal de Almeria | 1,018.17 mi (1,638.59 km) |
| Northolt to Huercal-Overa | 981.57 mi (1,579.68 km) |
| Northolt to Huesca | 650.41 mi (1,046.73 km) |
| Northolt to Huetor Vega | 1,006.92 mi (1,620.49 km) |
| Northolt to Huetor-Tajar | 1,007.78 mi (1,621.86 km) |
| Northolt to Humanes de Madrid | 797.54 mi (1,283.51 km) |
| Northolt to Ibi | 892.71 mi (1,436.67 km) |
| Northolt to Ibiza | 877.51 mi (1,412.22 km) |
| Northolt to Icod de los Vinos | 1,811.85 mi (2,915.89 km) |
| Northolt to Igualada | 694.93 mi (1,118.38 km) |
| Northolt to Illescas | 806.90 mi (1,298.58 km) |
| Northolt to Inca | 832.43 mi (1,339.67 km) |
| Northolt to Ingenio | 1,809.80 mi (2,912.60 km) |
