| Willoughby to Des Plaines (Illinois) | 335.19 mi (539.44 km) |
| Willoughby to Desert Hot Springs (California) | 1,975.33 mi (3,178.99 km) |
| Willoughby to DeSoto (Texas) | 1,053.53 mi (1,695.50 km) |
| Willoughby to Destin (Florida) | 826.81 mi (1,330.63 km) |
| Willoughby to Destrehan (Louisiana) | 949.35 mi (1,527.82 km) |
| Willoughby to Detroit (Michigan) | 100.79 mi (162.20 km) |
| Willoughby to Diamond Bar (California) | 2,039.61 mi (3,282.44 km) |
| Willoughby to Diamond Springs (California) | 2,073.64 mi (3,337.21 km) |
| Willoughby to Dickinson (North Dakota) | 1,114.16 mi (1,793.07 km) |
| Willoughby to Dickinson (Texas) | 1,136.56 mi (1,829.11 km) |
| Willoughby to Dickson (Tennessee) | 501.25 mi (806.69 km) |
| Willoughby to Difficult Run (Virginia) | 285.93 mi (460.15 km) |
| Willoughby to Dinuba (California) | 2,050.43 mi (3,299.85 km) |
| Willoughby to Discovery Bay (California) | 2,130.34 mi (3,428.46 km) |
| Willoughby to Dix Hills (New York) | 423.28 mi (681.21 km) |
