| Watford to Selargius | 972.12 mi (1,564.48 km) |
| Watford to Selvazzano Dentro | 704.48 mi (1,133.74 km) |
| Watford to Senago | 603.58 mi (971.37 km) |
| Watford to Senigallia | 835.53 mi (1,344.66 km) |
| Watford to Seravezza | 721.64 mi (1,161.37 km) |
| Watford to Seregno | 602.39 mi (969.46 km) |
| Watford to Seriate | 617.95 mi (994.50 km) |
| Watford to Sermoneta | 940.91 mi (1,514.24 km) |
| Watford to Serramanna | 956.14 mi (1,538.76 km) |
| Watford to Serravalle Pistoiese | 746.01 mi (1,200.59 km) |
| Watford to Sessa Aurunca | 988.47 mi (1,590.78 km) |
| Watford to Sesto Calende | 579.69 mi (932.91 km) |
| Watford to Sesto Fiorentino | 761.37 mi (1,225.30 km) |
| Watford to Sesto San Giovanni | 609.40 mi (980.74 km) |
| Watford to Sestri Levante | 680.90 mi (1,095.80 km) |
