| Willoughby to Darby (Pennsylvania) | 342.88 mi (551.82 km) |
| Willoughby to Dardenne Prairie (Missouri) | 530.62 mi (853.95 km) |
| Willoughby to Darien (Illinois) | 339.14 mi (545.79 km) |
| Willoughby to Davenport (Iowa) | 474.99 mi (764.42 km) |
| Willoughby to Davidson (North Carolina) | 426.91 mi (687.04 km) |
| Willoughby to Davie (Florida) | 1,077.47 mi (1,734.02 km) |
| Willoughby to Davis (California) | 2,122.59 mi (3,415.98 km) |
| Willoughby to Dayton (Nevada) | 1,996.52 mi (3,213.09 km) |
| Willoughby to Dayton (Ohio) | 194.89 mi (313.65 km) |
| Willoughby to Daytona Beach (Florida) | 860.14 mi (1,384.26 km) |
| Willoughby to De Pere (Wisconsin) | 387.74 mi (624.01 km) |
| Willoughby to De Witt (New York) | 288.29 mi (463.97 km) |
| Willoughby to Dearborn (Michigan) | 103.51 mi (166.58 km) |
| Willoughby to Dearborn Heights (Michigan) | 106.56 mi (171.50 km) |
| Willoughby to DeBary (Florida) | 881.95 mi (1,419.36 km) |
