| Watford to Alcorcon | 798.10 mi (1,284.41 km) |
| Watford to Alcoy | 895.23 mi (1,440.73 km) |
| Watford to Alcudia | 832.64 mi (1,340.00 km) |
| Watford to Aldaya | 842.33 mi (1,355.60 km) |
| Watford to Alella | 713.38 mi (1,148.07 km) |
| Watford to Alfafar | 845.20 mi (1,360.23 km) |
| Watford to Alfaro | 657.85 mi (1,058.71 km) |
| Watford to Algeciras | 1,101.34 mi (1,772.43 km) |
| Watford to Algemesi | 861.27 mi (1,386.08 km) |
| Watford to Algete | 778.12 mi (1,252.26 km) |
| Watford to Alginet | 856.25 mi (1,377.99 km) |
| Watford to Alguazas | 940.81 mi (1,514.09 km) |
| Watford to Alhama de Murcia | 955.05 mi (1,537.01 km) |
| Watford to Alhaurin de la Torre | 1,055.42 mi (1,698.53 km) |
| Watford to Alhaurin el Grande | 1,058.98 mi (1,704.27 km) |
