| Duncan to Wichita (Kansas) | 219.93 mi (353.94 km) |
| Duncan to Wichita Falls (Texas) | 55.87 mi (89.91 km) |
| Duncan to Wickliffe (Ohio) | 1,016.95 mi (1,636.62 km) |
| Duncan to Wildomar (California) | 1,106.74 mi (1,781.13 km) |
| Duncan to Wildwood (Florida) | 1,015.64 mi (1,634.51 km) |
| Duncan to Wildwood (Missouri) | 489.49 mi (787.76 km) |
| Duncan to Wilkes-Barre (Pennsylvania) | 1,283.80 mi (2,066.07 km) |
| Duncan to Wilkinsburg (Pennsylvania) | 1,067.66 mi (1,718.24 km) |
| Duncan to Williamsburg (Virginia) | 1,199.50 mi (1,930.41 km) |
| Duncan to Williamsport (Pennsylvania) | 1,225.33 mi (1,971.99 km) |
| Duncan to Williamstown (New Jersey) | 1,309.05 mi (2,106.72 km) |
| Duncan to Willimantic (Connecticut) | 1,475.99 mi (2,375.38 km) |
| Duncan to Williston (North Dakota) | 987.26 mi (1,588.84 km) |
| Duncan to Willmar (Minnesota) | 746.56 mi (1,201.47 km) |
| Duncan to Willoughby (Ohio) | 1,020.88 mi (1,642.95 km) |
