| Watford to Santa Ursula | 1,807.69 mi (2,909.20 km) |
| Watford to Santander | 587.75 mi (945.90 km) |
| Watford to Santany | 866.60 mi (1,394.65 km) |
| Watford to Santiago de Compostela | 715.77 mi (1,151.92 km) |
| Watford to Santiago del Teide | 1,823.63 mi (2,934.85 km) |
| Watford to Santiponce | 1,020.31 mi (1,642.03 km) |
| Watford to Santomera | 939.74 mi (1,512.37 km) |
| Watford to Santona | 585.05 mi (941.55 km) |
| Watford to Santurce-Antiguo | 588.09 mi (946.44 km) |
| Watford to Sarria | 695.16 mi (1,118.75 km) |
| Watford to Sauzal | 1,802.89 mi (2,901.48 km) |
| Watford to Sedavi | 844.87 mi (1,359.68 km) |
| Watford to Segorbe | 815.53 mi (1,312.46 km) |
| Watford to Segovia | 760.55 mi (1,223.99 km) |
| Watford to Senmanat | 704.34 mi (1,133.52 km) |
