| Porthcawl to Desert Hot Springs (California) | 5,273.72 mi (8,487.23 km) |
| Porthcawl to DeSoto (Texas) | 4,621.74 mi (7,437.98 km) |
| Porthcawl to Destin (Florida) | 4,311.09 mi (6,938.03 km) |
| Porthcawl to Destrehan (Louisiana) | 4,493.67 mi (7,231.86 km) |
| Porthcawl to Detroit (Michigan) | 3,611.59 mi (5,812.29 km) |
| Porthcawl to Diamond Bar (California) | 5,314.07 mi (8,552.18 km) |
| Porthcawl to Diamond Springs (California) | 5,147.24 mi (8,283.69 km) |
| Porthcawl to Dickinson (North Dakota) | 4,127.91 mi (6,643.22 km) |
| Porthcawl to Dickinson (Texas) | 4,710.43 mi (7,580.70 km) |
| Porthcawl to Dickson (Tennessee) | 4,071.92 mi (6,553.12 km) |
| Porthcawl to Difficult Run (Virginia) | 3,531.96 mi (5,684.15 km) |
| Porthcawl to Dinuba (California) | 5,222.86 mi (8,405.38 km) |
| Porthcawl to Discovery Bay (California) | 5,215.34 mi (8,393.28 km) |
| Porthcawl to Dix Hills (New York) | 3,283.90 mi (5,284.93 km) |
| Porthcawl to Dixon (California) | 5,191.58 mi (8,355.05 km) |
