| Slough to La Union | 959.75 mi (1,544.57 km) |
| Slough to La Victoria de Acentejo | 1,793.53 mi (2,886.40 km) |
| Slough to Laguna de Duero | 712.97 mi (1,147.42 km) |
| Slough to Lalin | 706.31 mi (1,136.70 km) |
| Slough to Lardero | 633.65 mi (1,019.77 km) |
| Slough to Laredo | 574.45 mi (924.49 km) |
| Slough to Las Cabezas de San Juan | 1,037.36 mi (1,669.47 km) |
| Slough to Las Palmas | 1,789.42 mi (2,879.80 km) |
| Slough to Las Rozas de Madrid | 777.13 mi (1,250.67 km) |
| Slough to Las Torres de Cotillas | 932.06 mi (1,500.01 km) |
| Slough to Lebrija | 1,043.27 mi (1,678.98 km) |
| Slough to Leganes | 787.23 mi (1,266.92 km) |
| Slough to Leon | 657.92 mi (1,058.82 km) |
| Slough to Lepe | 1,036.57 mi (1,668.20 km) |
| Slough to Linares | 939.31 mi (1,511.67 km) |
