| Merthyr Tudful to Sentrupert | 925.77 mi (1,489.88 km) |
| Merthyr Tudful to Sevnica | 933.31 mi (1,502.02 km) |
| Merthyr Tudful to Sezana | 887.02 mi (1,427.53 km) |
| Merthyr Tudful to Skocjan | 936.55 mi (1,507.23 km) |
| Merthyr Tudful to Skofja Loka | 886.85 mi (1,427.24 km) |
| Merthyr Tudful to Skofljica | 904.70 mi (1,455.97 km) |
| Merthyr Tudful to Slovenj Gradec | 906.27 mi (1,458.50 km) |
| Merthyr Tudful to Slovenska Bistrica | 930.80 mi (1,497.98 km) |
| Merthyr Tudful to Slovenske Konjice | 926.39 mi (1,490.88 km) |
| Merthyr Tudful to Smarje | 934.18 mi (1,503.42 km) |
| Merthyr Tudful to Smarjeske Toplice | 935.36 mi (1,505.31 km) |
| Merthyr Tudful to Smartno | 913.42 mi (1,470.01 km) |
| Merthyr Tudful to Smartno | 910.68 mi (1,465.59 km) |
| Merthyr Tudful to Sodrazica | 915.47 mi (1,473.31 km) |
| Merthyr Tudful to Solcava | 893.53 mi (1,438.00 km) |
