| Watford to Los Llanos de Aridane | 1,828.08 mi (2,942.01 km) |
| Watford to Los Palacios y Villafranca | 1,037.09 mi (1,669.04 km) |
| Watford to Luanco | 609.55 mi (980.98 km) |
| Watford to Lucena | 1,004.88 mi (1,617.20 km) |
| Watford to Lugo | 683.67 mi (1,100.26 km) |
| Watford to Lumbreras | 976.07 mi (1,570.83 km) |
| Watford to Madrid | 792.30 mi (1,275.09 km) |
| Watford to Madridejos | 855.49 mi (1,376.77 km) |
| Watford to Mahon | 842.93 mi (1,356.56 km) |
| Watford to Mairena del Alcor | 1,020.96 mi (1,643.07 km) |
| Watford to Mairena del Aljarafe | 1,027.46 mi (1,653.54 km) |
| Watford to Majadahonda | 790.15 mi (1,271.62 km) |
| Watford to Malaga | 1,050.62 mi (1,690.81 km) |
| Watford to Malgrat de Mar | 707.24 mi (1,138.20 km) |
| Watford to Manacor | 852.70 mi (1,372.28 km) |
