| Porthcawl to Dixon (Illinois) | 3,884.45 mi (6,251.42 km) |
| Porthcawl to Dobbs Ferry (New York) | 3,297.07 mi (5,306.12 km) |
| Porthcawl to Doctor Phillips (Florida) | 4,198.42 mi (6,756.71 km) |
| Porthcawl to Dodge City (Kansas) | 4,481.34 mi (7,212.02 km) |
| Porthcawl to Dolton (Illinois) | 3,821.52 mi (6,150.13 km) |
| Porthcawl to Donna (Texas) | 5,002.98 mi (8,051.52 km) |
| Porthcawl to Dorado (Puerto Rico) | 4,054.37 mi (6,524.89 km) |
| Porthcawl to Doral (Florida) | 4,281.41 mi (6,890.27 km) |
| Porthcawl to Doraville (Georgia) | 4,048.70 mi (6,515.76 km) |
| Porthcawl to Dothan (Alabama) | 4,225.55 mi (6,800.37 km) |
| Porthcawl to Douglas (Arizona) | 5,169.25 mi (8,319.11 km) |
| Porthcawl to Douglas (Georgia) | 4,105.74 mi (6,607.56 km) |
| Porthcawl to Douglasville (Georgia) | 4,074.74 mi (6,557.65 km) |
| Porthcawl to Dover (Delaware) | 3,444.96 mi (5,544.13 km) |
| Porthcawl to Dover (New Hampshire) | 3,084.68 mi (4,964.31 km) |
