| Porthcawl to Dover (New Jersey) | 3,330.90 mi (5,360.56 km) |
| Porthcawl to Dover (Ohio) | 3,628.47 mi (5,839.47 km) |
| Porthcawl to Downers Grove (Illinois) | 3,830.23 mi (6,164.15 km) |
| Porthcawl to Downey (California) | 5,328.03 mi (8,574.64 km) |
| Porthcawl to Dranesville (Virginia) | 3,528.72 mi (5,678.93 km) |
| Porthcawl to Draper (Utah) | 4,758.87 mi (7,658.67 km) |
| Porthcawl to Drexel Heights (Arizona) | 5,181.40 mi (8,338.65 km) |
| Porthcawl to Drexel Hill (Pennsylvania) | 3,401.72 mi (5,474.53 km) |
| Porthcawl to Duarte (California) | 5,309.48 mi (8,544.78 km) |
| Porthcawl to Dublin (California) | 5,235.37 mi (8,425.51 km) |
| Porthcawl to Dublin (Georgia) | 4,058.95 mi (6,532.25 km) |
| Porthcawl to Dublin (Ohio) | 3,714.12 mi (5,977.30 km) |
| Porthcawl to Dubuque (Iowa) | 3,901.23 mi (6,278.42 km) |
| Porthcawl to Duluth (Georgia) | 4,038.97 mi (6,500.10 km) |
| Porthcawl to Duluth (Minnesota) | 3,760.97 mi (6,052.69 km) |
