| Watford to Seysses | 569.14 mi (915.94 km) |
| Watford to Sin-le-Noble | 176.71 mi (284.39 km) |
| Watford to Six-Fours-les-Plages | 658.13 mi (1,059.15 km) |
| Watford to Soissons | 226.59 mi (364.67 km) |
| Watford to Soisy-sous-Montmorency | 219.28 mi (352.90 km) |
| Watford to Sollies-Pont | 657.13 mi (1,057.55 km) |
| Watford to Somain | 183.21 mi (294.85 km) |
| Watford to Sorgues | 581.73 mi (936.21 km) |
| Watford to Sotteville-les-Rouen | 168.32 mi (270.89 km) |
| Watford to Soyaux | 416.45 mi (670.22 km) |
| Watford to Stains | 223.51 mi (359.70 km) |
| Watford to Stiring-Wendel | 364.08 mi (585.93 km) |
| Watford to Strasbourg | 418.14 mi (672.94 km) |
| Watford to Sucy-en-Brie | 237.43 mi (382.11 km) |
| Watford to Suresnes | 224.41 mi (361.15 km) |
