| Llantwit Major to Dumas (Texas) | 4,661.40 mi (7,501.79 km) |
| Llantwit Major to Dumont (New Jersey) | 3,315.31 mi (5,335.47 km) |
| Llantwit Major to Duncan (Oklahoma) | 4,574.96 mi (7,362.69 km) |
| Llantwit Major to Duncanville (Texas) | 4,631.84 mi (7,454.22 km) |
| Llantwit Major to Dundalk (Maryland) | 3,490.80 mi (5,617.90 km) |
| Llantwit Major to Dunedin (Florida) | 4,283.86 mi (6,894.21 km) |
| Llantwit Major to Dunkirk (New York) | 3,467.81 mi (5,580.89 km) |
| Llantwit Major to Dunmore (Pennsylvania) | 3,361.89 mi (5,410.44 km) |
| Llantwit Major to Dunwoody (Georgia) | 4,059.07 mi (6,532.45 km) |
| Llantwit Major to Durango (Colorado) | 4,803.80 mi (7,730.97 km) |
| Llantwit Major to Durant (Oklahoma) | 4,543.06 mi (7,311.34 km) |
| Llantwit Major to Durham (North Carolina) | 3,738.85 mi (6,017.10 km) |
| Llantwit Major to Dyer (Indiana) | 3,834.55 mi (6,171.11 km) |
| Llantwit Major to Dyersburg (Tennessee) | 4,164.06 mi (6,701.41 km) |
| Llantwit Major to Eagan (Minnesota) | 3,897.29 mi (6,272.08 km) |
