| Merthyr Tudful to Selargius | 1,051.96 mi (1,692.97 km) |
| Merthyr Tudful to Selvazzano Dentro | 818.36 mi (1,317.03 km) |
| Merthyr Tudful to Senago | 710.53 mi (1,143.49 km) |
| Merthyr Tudful to Senigallia | 946.55 mi (1,523.33 km) |
| Merthyr Tudful to Seravezza | 824.82 mi (1,327.42 km) |
| Merthyr Tudful to Seregno | 709.93 mi (1,142.53 km) |
| Merthyr Tudful to Seriate | 727.43 mi (1,170.69 km) |
| Merthyr Tudful to Sermoneta | 1,043.62 mi (1,679.55 km) |
| Merthyr Tudful to Serramanna | 1,035.39 mi (1,666.31 km) |
| Merthyr Tudful to Serravalle Pistoiese | 850.84 mi (1,369.30 km) |
| Merthyr Tudful to Sessa Aurunca | 1,092.94 mi (1,758.91 km) |
| Merthyr Tudful to Sesto Calende | 685.57 mi (1,103.32 km) |
| Merthyr Tudful to Sesto Fiorentino | 867.13 mi (1,395.51 km) |
| Merthyr Tudful to Sesto San Giovanni | 716.45 mi (1,153.01 km) |
| Merthyr Tudful to Sestri Levante | 782.15 mi (1,258.75 km) |
