| Watford to Sierpc | 849.71 mi (1,367.47 km) |
| Watford to Skarzysko-Kamienna | 916.46 mi (1,474.90 km) |
| Watford to Skawina | 887.63 mi (1,428.49 km) |
| Watford to Skierniewice | 875.01 mi (1,408.19 km) |
| Watford to Skoczow | 846.24 mi (1,361.89 km) |
| Watford to Skwierzyna | 676.01 mi (1,087.93 km) |
| Watford to Slawno | 731.86 mi (1,177.81 km) |
| Watford to Slubice | 637.10 mi (1,025.31 km) |
| Watford to Slupca | 776.45 mi (1,249.57 km) |
| Watford to Slupsk | 746.98 mi (1,202.15 km) |
| Watford to Sochaczew | 876.55 mi (1,410.67 km) |
| Watford to Sokolka | 1,006.86 mi (1,620.38 km) |
| Watford to Sokolow Podlaski | 960.14 mi (1,545.20 km) |
| Watford to Solec Kujawski | 789.78 mi (1,271.03 km) |
| Watford to Sopot | 808.14 mi (1,300.58 km) |
