| Merthyr Tudful to Saarijarvi | 1,294.37 mi (2,083.09 km) |
| Merthyr Tudful to Salo | 1,172.09 mi (1,886.29 km) |
| Merthyr Tudful to Sastamala | 1,188.22 mi (1,912.25 km) |
| Merthyr Tudful to Savonlinna | 1,385.85 mi (2,230.31 km) |
| Merthyr Tudful to Seinajoki | 1,227.20 mi (1,974.99 km) |
| Merthyr Tudful to Siilinjarvi | 1,374.11 mi (2,211.41 km) |
| Merthyr Tudful to Sipoo | 1,241.90 mi (1,998.64 km) |
| Merthyr Tudful to Sippola | 1,305.12 mi (2,100.39 km) |
| Merthyr Tudful to Sodankyla | 1,478.78 mi (2,379.87 km) |
| Merthyr Tudful to Somero | 1,190.21 mi (1,915.46 km) |
| Merthyr Tudful to Sotkamo | 1,421.12 mi (2,287.08 km) |
| Merthyr Tudful to Tampere | 1,218.37 mi (1,960.77 km) |
| Merthyr Tudful to Tornio | 1,364.76 mi (2,196.37 km) |
| Merthyr Tudful to Turku | 1,145.95 mi (1,844.23 km) |
| Merthyr Tudful to Tuusula | 1,235.70 mi (1,988.67 km) |
