| Watford to Solofra | 1,039.90 mi (1,673.56 km) |
| Watford to Somma Lombardo | 584.41 mi (940.51 km) |
| Watford to Somma Vesuviana | 1,024.30 mi (1,648.45 km) |
| Watford to Sommacampagna | 670.68 mi (1,079.36 km) |
| Watford to Sona | 668.50 mi (1,075.85 km) |
| Watford to Sondrio | 599.82 mi (965.32 km) |
| Watford to Sora | 952.16 mi (1,532.36 km) |
| Watford to Sorbolo | 684.41 mi (1,101.45 km) |
| Watford to Soresina | 642.48 mi (1,033.97 km) |
| Watford to Sorisole | 613.27 mi (986.97 km) |
| Watford to Sorrento | 1,035.58 mi (1,666.60 km) |
| Watford to Sorso | 862.61 mi (1,388.23 km) |
| Watford to Sortino | 1,252.30 mi (2,015.38 km) |
| Watford to Soverato Marina | 1,212.59 mi (1,951.48 km) |
| Watford to Sovicille | 791.60 mi (1,273.97 km) |
