| Watford to Sabadell | 708.23 mi (1,139.79 km) |
| Watford to Sabinanigo | 631.27 mi (1,015.92 km) |
| Watford to Sagunto | 827.66 mi (1,331.99 km) |
| Watford to Salamanca | 779.71 mi (1,254.83 km) |
| Watford to Salobrena | 1,041.86 mi (1,676.71 km) |
| Watford to Salou | 734.26 mi (1,181.68 km) |
| Watford to Salt | 685.31 mi (1,102.89 km) |
| Watford to Salvatierra de Mino | 763.08 mi (1,228.05 km) |
| Watford to Sama | 627.46 mi (1,009.79 km) |
| Watford to San Adrian de Besos | 717.16 mi (1,154.16 km) |
| Watford to San Agustin de Guadalix | 773.71 mi (1,245.17 km) |
| Watford to San Andres de la Barca | 714.10 mi (1,149.23 km) |
| Watford to San Andres de Llevaneras | 709.70 mi (1,142.15 km) |
| Watford to San Andres del Rabanedo | 670.25 mi (1,078.67 km) |
| Watford to San Bartolome | 1,818.49 mi (2,926.58 km) |
