| Merthyr Tudful to Port Chester (New York) | 3,296.84 mi (5,305.75 km) |
| Merthyr Tudful to Port Hueneme (California) | 5,349.46 mi (8,609.12 km) |
| Merthyr Tudful to Port Huron (Michigan) | 3,564.37 mi (5,736.30 km) |
| Merthyr Tudful to Port Lavaca (Texas) | 4,822.73 mi (7,761.44 km) |
| Merthyr Tudful to Port Neches (Texas) | 4,645.17 mi (7,475.69 km) |
| Merthyr Tudful to Port Orange (Florida) | 4,155.50 mi (6,687.63 km) |
| Merthyr Tudful to Port Orchard (Washington) | 4,698.61 mi (7,561.67 km) |
| Merthyr Tudful to Port Royal (South Carolina) | 3,983.60 mi (6,410.98 km) |
| Merthyr Tudful to Port Salerno (Florida) | 4,218.42 mi (6,788.89 km) |
| Merthyr Tudful to Port St. John (Florida) | 4,178.33 mi (6,724.37 km) |
| Merthyr Tudful to Port St. Lucie (Florida) | 4,220.16 mi (6,791.69 km) |
| Merthyr Tudful to Port Washington (New York) | 3,304.78 mi (5,318.54 km) |
| Merthyr Tudful to Port Washington (Wisconsin) | 3,757.09 mi (6,046.45 km) |
| Merthyr Tudful to Port Wentworth (Georgia) | 4,012.07 mi (6,456.80 km) |
| Merthyr Tudful to Portage (Indiana) | 3,811.61 mi (6,134.19 km) |
