| Merthyr Tudful to Scottsboro (Alabama) | 4,093.42 mi (6,587.72 km) |
| Merthyr Tudful to Scottsdale (Arizona) | 5,127.17 mi (8,251.39 km) |
| Merthyr Tudful to Scranton (Pennsylvania) | 3,361.49 mi (5,409.80 km) |
| Merthyr Tudful to Seabrook (Maryland) | 3,515.77 mi (5,658.08 km) |
| Merthyr Tudful to Seabrook (Texas) | 4,709.03 mi (7,578.45 km) |
| Merthyr Tudful to Seaford (New York) | 3,303.99 mi (5,317.26 km) |
| Merthyr Tudful to Seagoville (Texas) | 4,611.44 mi (7,421.39 km) |
| Merthyr Tudful to Seal Beach (California) | 5,335.27 mi (8,586.29 km) |
| Merthyr Tudful to Searcy (Arkansas) | 4,292.15 mi (6,907.55 km) |
| Merthyr Tudful to Seaside (California) | 5,292.56 mi (8,517.55 km) |
| Merthyr Tudful to SeaTac (Washington) | 4,692.76 mi (7,552.27 km) |
| Merthyr Tudful to Seattle (Washington) | 4,683.57 mi (7,537.47 km) |
| Merthyr Tudful to Sebastian (Florida) | 4,199.00 mi (6,757.63 km) |
| Merthyr Tudful to Sebring (Florida) | 4,255.29 mi (6,848.22 km) |
| Merthyr Tudful to Secaucus (New Jersey) | 3,322.75 mi (5,347.44 km) |
