| Merthyr Tudful to Sucha Beskidzka | 1,009.38 mi (1,624.44 km) |
| Merthyr Tudful to Suchanino | 926.73 mi (1,491.42 km) |
| Merthyr Tudful to Sulechow | 807.60 mi (1,299.70 km) |
| Merthyr Tudful to Sulecin | 784.19 mi (1,262.03 km) |
| Merthyr Tudful to Sulejowek | 1,044.55 mi (1,681.05 km) |
| Merthyr Tudful to Suwalki | 1,101.32 mi (1,772.40 km) |
| Merthyr Tudful to Swarzedz | 866.72 mi (1,394.85 km) |
| Merthyr Tudful to Swidnica | 857.62 mi (1,380.21 km) |
| Merthyr Tudful to Swidnik | 1,116.75 mi (1,797.24 km) |
| Merthyr Tudful to Swidwin | 810.15 mi (1,303.82 km) |
| Merthyr Tudful to Swiebodzice | 850.98 mi (1,369.52 km) |
| Merthyr Tudful to Swiecie | 919.35 mi (1,479.54 km) |
| Merthyr Tudful to Swiedbodzin | 802.99 mi (1,292.28 km) |
| Merthyr Tudful to Swietochlowice | 970.43 mi (1,561.76 km) |
| Merthyr Tudful to Swinoujscie | 748.97 mi (1,205.35 km) |
