| Porthcawl to Dumas (Texas) | 4,650.83 mi (7,484.79 km) |
| Porthcawl to Dumont (New Jersey) | 3,304.98 mi (5,318.85 km) |
| Porthcawl to Duncan (Oklahoma) | 4,564.40 mi (7,345.69 km) |
| Porthcawl to Duncanville (Texas) | 4,621.30 mi (7,437.27 km) |
| Porthcawl to Dundalk (Maryland) | 3,480.48 mi (5,601.30 km) |
| Porthcawl to Dunedin (Florida) | 4,273.82 mi (6,878.05 km) |
| Porthcawl to Dunkirk (New York) | 3,457.33 mi (5,564.03 km) |
| Porthcawl to Dunmore (Pennsylvania) | 3,351.51 mi (5,393.73 km) |
| Porthcawl to Dunwoody (Georgia) | 4,048.74 mi (6,515.83 km) |
| Porthcawl to Durango (Colorado) | 4,793.28 mi (7,714.04 km) |
| Porthcawl to Durant (Oklahoma) | 4,532.51 mi (7,294.38 km) |
| Porthcawl to Durham (North Carolina) | 3,728.60 mi (6,000.60 km) |
| Porthcawl to Dyer (Indiana) | 3,824.00 mi (6,154.13 km) |
| Porthcawl to Dyersburg (Tennessee) | 4,153.57 mi (6,684.53 km) |
| Porthcawl to Eagan (Minnesota) | 3,886.73 mi (6,255.09 km) |
