| Porthcawl to Dardenne Prairie (Missouri) | 4,077.38 mi (6,561.91 km) |
| Porthcawl to Darien (Illinois) | 3,831.15 mi (6,165.64 km) |
| Porthcawl to Davenport (Iowa) | 3,940.94 mi (6,342.33 km) |
| Porthcawl to Davidson (North Carolina) | 3,831.47 mi (6,166.15 km) |
| Porthcawl to Davie (Florida) | 4,265.21 mi (6,864.19 km) |
| Porthcawl to Davis (California) | 5,182.72 mi (8,340.78 km) |
| Porthcawl to Dayton (Nevada) | 5,075.64 mi (8,168.46 km) |
| Porthcawl to Dayton (Ohio) | 3,771.33 mi (6,069.37 km) |
| Porthcawl to Daytona Beach (Florida) | 4,144.65 mi (6,670.16 km) |
| Porthcawl to De Pere (Wisconsin) | 3,714.32 mi (5,977.61 km) |
| Porthcawl to De Witt (New York) | 3,303.27 mi (5,316.11 km) |
| Porthcawl to Dearborn (Michigan) | 3,619.06 mi (5,824.31 km) |
| Porthcawl to Dearborn Heights (Michigan) | 3,621.42 mi (5,828.11 km) |
| Porthcawl to DeBary (Florida) | 4,169.88 mi (6,710.77 km) |
| Porthcawl to Decatur (Alabama) | 4,128.21 mi (6,643.72 km) |
