| Willoughby to Delaware (Ohio) | 128.03 mi (206.04 km) |
| Willoughby to Delhi (California) | 2,099.37 mi (3,378.62 km) |
| Willoughby to Delray Beach (Florida) | 1,052.26 mi (1,693.45 km) |
| Willoughby to Deltona (Florida) | 880.38 mi (1,416.83 km) |
| Willoughby to Deming (New Mexico) | 1,584.16 mi (2,549.46 km) |
| Willoughby to Denison (Texas) | 989.78 mi (1,592.89 km) |
| Willoughby to Dent (Ohio) | 240.83 mi (387.58 km) |
| Willoughby to Denton (Texas) | 1,038.67 mi (1,671.57 km) |
| Willoughby to Dentsville (South Carolina) | 523.65 mi (842.74 km) |
| Willoughby to Denver (Colorado) | 1,232.23 mi (1,983.08 km) |
| Willoughby to Depew (New York) | 163.57 mi (263.24 km) |
| Willoughby to Derby (Connecticut) | 431.29 mi (694.10 km) |
| Willoughby to Derby (Kansas) | 888.10 mi (1,429.27 km) |
| Willoughby to Des Moines (Iowa) | 629.86 mi (1,013.66 km) |
| Willoughby to Des Moines (Washington) | 2,029.65 mi (3,266.41 km) |
