| Merthyr Tudful to Dallas (Texas) | 4,612.90 mi (7,423.75 km) |
| Merthyr Tudful to Dalton (Georgia) | 4,043.55 mi (6,507.47 km) |
| Merthyr Tudful to Daly City (California) | 5,251.55 mi (8,451.56 km) |
| Merthyr Tudful to Damascus (Maryland) | 3,517.06 mi (5,660.16 km) |
| Merthyr Tudful to Damascus (Oregon) | 4,810.42 mi (7,741.63 km) |
| Merthyr Tudful to Dana Point (California) | 5,338.66 mi (8,591.75 km) |
| Merthyr Tudful to Danbury (Connecticut) | 3,271.94 mi (5,265.68 km) |
| Merthyr Tudful to Dania Beach (Florida) | 4,271.94 mi (6,875.02 km) |
| Merthyr Tudful to Danville (California) | 5,229.10 mi (8,415.42 km) |
| Merthyr Tudful to Danville (Illinois) | 3,894.92 mi (6,268.27 km) |
| Merthyr Tudful to Danville (Indiana) | 3,869.24 mi (6,226.93 km) |
| Merthyr Tudful to Danville (Kentucky) | 3,899.27 mi (6,275.27 km) |
| Merthyr Tudful to Danville (Virginia) | 3,729.89 mi (6,002.68 km) |
| Merthyr Tudful to Daphne (Alabama) | 4,365.86 mi (7,026.18 km) |
| Merthyr Tudful to Darby (Pennsylvania) | 3,409.01 mi (5,486.27 km) |
