| Merthyr Tudful to San Diego (California) | 5,355.55 mi (8,618.93 km) |
| Merthyr Tudful to San Diego Country Estates (California) | 5,334.25 mi (8,584.65 km) |
| Merthyr Tudful to San Dimas (California) | 5,306.62 mi (8,540.18 km) |
| Merthyr Tudful to San Fernando (California) | 5,317.14 mi (8,557.11 km) |
| Merthyr Tudful to San Francisco (California) | 5,246.84 mi (8,443.97 km) |
| Merthyr Tudful to San Gabriel (California) | 5,316.96 mi (8,556.83 km) |
| Merthyr Tudful to San Germán (Puerto Rico) | 4,123.53 mi (6,636.18 km) |
| Merthyr Tudful to San Jacinto (California) | 5,296.90 mi (8,524.53 km) |
| Merthyr Tudful to San Jose (California) | 5,254.58 mi (8,456.43 km) |
| Merthyr Tudful to San Juan (Puerto Rico) | 4,065.26 mi (6,542.40 km) |
| Merthyr Tudful to San Juan (Texas) | 5,010.83 mi (8,064.16 km) |
| Merthyr Tudful to San Juan Capistrano (California) | 5,335.70 mi (8,586.98 km) |
| Merthyr Tudful to San Leandro (California) | 5,240.91 mi (8,434.43 km) |
| Merthyr Tudful to San Lorenzo (California) | 5,242.05 mi (8,436.26 km) |
| Merthyr Tudful to San Luis (Arizona) | 5,292.22 mi (8,517.00 km) |
