| Watford to Snodland | 42.71 mi (68.73 km) |
| Watford to Soham | 56.29 mi (90.59 km) |
| Watford to Solihull | 78.71 mi (126.67 km) |
| Watford to Sompting | 57.03 mi (91.79 km) |
| Watford to South Hayling | 65.00 mi (104.60 km) |
| Watford to South Normanton | 107.98 mi (173.78 km) |
| Watford to South Ockendon | 31.09 mi (50.04 km) |
| Watford to South Shields | 234.68 mi (377.68 km) |
| Watford to Southall | 9.90 mi (15.94 km) |
| Watford to Southampton | 67.84 mi (109.19 km) |
| Watford to Southborough | 44.52 mi (71.65 km) |
| Watford to Southbourne | 88.56 mi (142.52 km) |
| Watford to Southend | 48.00 mi (77.25 km) |
| Watford to Southgate | 11.65 mi (18.76 km) |
| Watford to Southport | 175.81 mi (282.94 km) |
