| Watford to Shoreham-by-Sea | 56.97 mi (91.69 km) |
| Watford to Shotley Bridge | 230.22 mi (370.50 km) |
| Watford to Shrewsbury | 123.58 mi (198.89 km) |
| Watford to Sidcup | 26.61 mi (42.82 km) |
| Watford to Sidmouth | 140.39 mi (225.93 km) |
| Watford to Sileby | 80.20 mi (129.07 km) |
| Watford to Sittingbourne | 53.48 mi (86.07 km) |
| Watford to Skegness | 107.46 mi (172.94 km) |
| Watford to Skelmersdale | 164.66 mi (265.00 km) |
| Watford to Skipton | 173.19 mi (278.73 km) |
| Watford to Sleaford | 92.66 mi (149.12 km) |
| Watford to Slough | 13.07 mi (21.03 km) |
| Watford to Small Heath | 83.39 mi (134.21 km) |
| Watford to Smethwick | 88.40 mi (142.27 km) |
| Watford to Snaresbrook | 18.22 mi (29.32 km) |
