| Merthyr Tudful to Sierpc | 972.38 mi (1,564.89 km) |
| Merthyr Tudful to Skarzysko-Kamienna | 1,042.61 mi (1,677.92 km) |
| Merthyr Tudful to Skawina | 1,015.14 mi (1,633.72 km) |
| Merthyr Tudful to Skierniewice | 999.81 mi (1,609.04 km) |
| Merthyr Tudful to Skoczow | 973.96 mi (1,567.43 km) |
| Merthyr Tudful to Skwierzyna | 799.84 mi (1,287.22 km) |
| Merthyr Tudful to Slawno | 849.12 mi (1,366.53 km) |
| Merthyr Tudful to Slubice | 761.73 mi (1,225.89 km) |
| Merthyr Tudful to Slupca | 900.85 mi (1,449.77 km) |
| Merthyr Tudful to Slupsk | 863.86 mi (1,390.25 km) |
| Merthyr Tudful to Sochaczew | 1,000.77 mi (1,610.58 km) |
| Merthyr Tudful to Sokolka | 1,127.70 mi (1,814.86 km) |
| Merthyr Tudful to Sokolow Podlaski | 1,083.66 mi (1,743.98 km) |
| Merthyr Tudful to Solec Kujawski | 911.98 mi (1,467.69 km) |
| Merthyr Tudful to Sopot | 925.44 mi (1,489.35 km) |
