| Watford to Sangeorgiu de Mures | 1,172.07 mi (1,886.26 km) |
| Watford to Sangeorz-Bai | 1,156.88 mi (1,861.81 km) |
| Watford to Sannicolau Mare | 1,025.60 mi (1,650.54 km) |
| Watford to Santana | 1,053.09 mi (1,694.78 km) |
| Watford to Satu Mare | 1,068.81 mi (1,720.09 km) |
| Watford to Scobinti | 1,252.87 mi (2,016.30 km) |
| Watford to Scornicesti | 1,242.71 mi (1,999.94 km) |
| Watford to Sebes | 1,153.02 mi (1,855.60 km) |
| Watford to Seini | 1,086.84 mi (1,749.10 km) |
| Watford to Sfantu-Gheorghe | 1,249.96 mi (2,011.62 km) |
| Watford to Sibiu | 1,183.11 mi (1,904.03 km) |
| Watford to Sighetu Marmatiei | 1,107.94 mi (1,783.05 km) |
| Watford to Sighisoara | 1,196.30 mi (1,925.27 km) |
| Watford to Simeria | 1,133.13 mi (1,823.59 km) |
| Watford to Sinaia | 1,257.12 mi (2,023.13 km) |
