| Merthyr Tudful to Sangeorgiu de Mures | 1,299.66 mi (2,091.61 km) |
| Merthyr Tudful to Sangeorz-Bai | 1,284.71 mi (2,067.53 km) |
| Merthyr Tudful to Sannicolau Mare | 1,151.73 mi (1,853.53 km) |
| Merthyr Tudful to Santana | 1,179.87 mi (1,898.82 km) |
| Merthyr Tudful to Satu Mare | 1,196.63 mi (1,925.79 km) |
| Merthyr Tudful to Scobinti | 1,380.70 mi (2,222.02 km) |
| Merthyr Tudful to Scornicesti | 1,368.98 mi (2,203.16 km) |
| Merthyr Tudful to Sebes | 1,280.10 mi (2,060.13 km) |
| Merthyr Tudful to Seini | 1,214.66 mi (1,954.81 km) |
| Merthyr Tudful to Sfantu-Gheorghe | 1,377.47 mi (2,216.82 km) |
| Merthyr Tudful to Sibiu | 1,310.23 mi (2,108.62 km) |
| Merthyr Tudful to Sighetu Marmatiei | 1,235.78 mi (1,988.80 km) |
| Merthyr Tudful to Sighisoara | 1,323.80 mi (2,130.46 km) |
| Merthyr Tudful to Simeria | 1,259.97 mi (2,027.72 km) |
| Merthyr Tudful to Sinaia | 1,384.30 mi (2,227.82 km) |
