| Holyhead to Decatur (Georgia) | 3,984.30 mi (6,412.11 km) |
| Holyhead to Decatur (Illinois) | 3,868.10 mi (6,225.10 km) |
| Holyhead to Deer Park (New York) | 3,214.59 mi (5,173.38 km) |
| Holyhead to Deer Park (Texas) | 4,620.34 mi (7,435.72 km) |
| Holyhead to Deerfield (Illinois) | 3,717.40 mi (5,982.58 km) |
| Holyhead to Deerfield Beach (Florida) | 4,193.40 mi (6,748.63 km) |
| Holyhead to Defiance (Ohio) | 3,625.86 mi (5,835.25 km) |
| Holyhead to DeForest (Wisconsin) | 3,723.32 mi (5,992.11 km) |
| Holyhead to DeKalb (Illinois) | 3,762.11 mi (6,054.53 km) |
| Holyhead to Del Aire (California) | 5,226.90 mi (8,411.89 km) |
| Holyhead to Del City (Oklahoma) | 4,409.44 mi (7,096.30 km) |
| Holyhead to Del Rio (Texas) | 4,859.24 mi (7,820.19 km) |
| Holyhead to DeLand (Florida) | 4,101.45 mi (6,600.64 km) |
| Holyhead to Delano (California) | 5,149.98 mi (8,288.10 km) |
| Holyhead to Delaware (Ohio) | 3,622.15 mi (5,829.29 km) |
