| Duncan to Dallas (Oregon) | 1,518.96 mi (2,444.52 km) |
| Duncan to Dallas (Texas) | 137.78 mi (221.74 km) |
| Duncan to Dalton (Georgia) | 735.65 mi (1,183.92 km) |
| Duncan to Daly City (California) | 1,383.19 mi (2,226.03 km) |
| Duncan to Damascus (Maryland) | 1,187.76 mi (1,911.52 km) |
| Duncan to Damascus (Oregon) | 1,491.42 mi (2,400.21 km) |
| Duncan to Dana Point (California) | 1,133.24 mi (1,823.77 km) |
| Duncan to Danbury (Connecticut) | 1,407.84 mi (2,265.71 km) |
| Duncan to Dania Beach (Florida) | 1,207.95 mi (1,944.01 km) |
| Duncan to Danville (California) | 1,356.25 mi (2,182.68 km) |
| Duncan to Danville (Illinois) | 685.24 mi (1,102.79 km) |
| Duncan to Danville (Indiana) | 724.05 mi (1,165.25 km) |
| Duncan to Danville (Kentucky) | 763.73 mi (1,229.11 km) |
| Duncan to Danville (Virginia) | 1,048.39 mi (1,687.23 km) |
| Duncan to Daphne (Alabama) | 643.62 mi (1,035.81 km) |
