| Watford to La Union | 970.06 mi (1,561.16 km) |
| Watford to La Victoria de Acentejo | 1,806.53 mi (2,907.33 km) |
| Watford to Laguna de Duero | 725.14 mi (1,167.00 km) |
| Watford to Lalin | 719.31 mi (1,157.61 km) |
| Watford to Lardero | 644.96 mi (1,037.96 km) |
| Watford to Laredo | 586.34 mi (943.62 km) |
| Watford to Las Cabezas de San Juan | 1,049.46 mi (1,688.94 km) |
| Watford to Las Palmas | 1,802.37 mi (2,900.63 km) |
| Watford to Las Rozas de Madrid | 788.88 mi (1,269.57 km) |
| Watford to Las Torres de Cotillas | 942.54 mi (1,516.88 km) |
| Watford to Lebrija | 1,055.40 mi (1,698.50 km) |
| Watford to Leganes | 798.92 mi (1,285.73 km) |
| Watford to Leon | 670.47 mi (1,079.01 km) |
| Watford to Lepe | 1,048.98 mi (1,688.18 km) |
| Watford to Linares | 950.77 mi (1,530.12 km) |
