| Watford to Sudbury | 54.91 mi (88.37 km) |
| Watford to Sunbury | 16.08 mi (25.87 km) |
| Watford to Sunderland | 228.27 mi (367.37 km) |
| Watford to Sunninghill | 20.70 mi (33.32 km) |
| Watford to Surbiton | 18.43 mi (29.66 km) |
| Watford to Sutton | 21.76 mi (35.01 km) |
| Watford to Sutton Coldfield | 87.17 mi (140.29 km) |
| Watford to Sutton in Ashfield | 107.92 mi (173.68 km) |
| Watford to Sutton on Hull | 146.91 mi (236.44 km) |
| Watford to Swadlincote | 91.62 mi (147.45 km) |
| Watford to Swallownest | 124.27 mi (199.99 km) |
| Watford to Swanage | 99.16 mi (159.58 km) |
| Watford to Swindon | 59.76 mi (96.18 km) |
| Watford to Swinton | 132.38 mi (213.04 km) |
| Watford to Swinton | 152.09 mi (244.77 km) |
