| Merthyr Tudful to Wichita (Kansas) | 4,387.46 mi (7,060.93 km) |
| Merthyr Tudful to Wichita Falls (Texas) | 4,624.19 mi (7,441.91 km) |
| Merthyr Tudful to Wickliffe (Ohio) | 3,586.35 mi (5,771.67 km) |
| Merthyr Tudful to Wildomar (California) | 5,315.91 mi (8,555.14 km) |
| Merthyr Tudful to Wildwood (Florida) | 4,213.85 mi (6,781.54 km) |
| Merthyr Tudful to Wildwood (Missouri) | 4,087.97 mi (6,578.96 km) |
| Merthyr Tudful to Wilkes-Barre (Pennsylvania) | 3,376.83 mi (5,434.48 km) |
| Merthyr Tudful to Wilkinsburg (Pennsylvania) | 3,573.86 mi (5,751.57 km) |
| Merthyr Tudful to Williamsburg (Virginia) | 3,586.80 mi (5,772.40 km) |
| Merthyr Tudful to Williamsport (Pennsylvania) | 3,424.32 mi (5,510.91 km) |
| Merthyr Tudful to Williamstown (New Jersey) | 3,407.58 mi (5,483.97 km) |
| Merthyr Tudful to Willimantic (Connecticut) | 3,206.97 mi (5,161.12 km) |
| Merthyr Tudful to Williston (North Dakota) | 4,091.98 mi (6,585.41 km) |
| Merthyr Tudful to Willmar (Minnesota) | 3,943.10 mi (6,345.80 km) |
| Merthyr Tudful to Willoughby (Ohio) | 3,582.23 mi (5,765.05 km) |
