| Duncan to St. George (Utah) | 893.34 mi (1,437.70 km) |
| Duncan to St. Helens (Oregon) | 1,519.32 mi (2,445.11 km) |
| Duncan to St. James (New York) | 1,417.31 mi (2,280.94 km) |
| Duncan to St. John (Indiana) | 741.54 mi (1,193.39 km) |
| Duncan to St. Joseph (Missouri) | 398.91 mi (641.98 km) |
| Duncan to St. Louis (Missouri) | 511.00 mi (822.37 km) |
| Duncan to St. Louis Park (Minnesota) | 758.44 mi (1,220.59 km) |
| Duncan to St. Marys (Georgia) | 985.14 mi (1,585.42 km) |
| Duncan to St. Marys (Pennsylvania) | 1,155.31 mi (1,859.29 km) |
| Duncan to St. Matthews (Kentucky) | 728.90 mi (1,173.04 km) |
| Duncan to St. Michael (Minnesota) | 769.67 mi (1,238.66 km) |
| Duncan to St. Paul (Minnesota) | 762.87 mi (1,227.72 km) |
| Duncan to St. Peter (Minnesota) | 708.27 mi (1,139.86 km) |
| Duncan to St. Peters (Missouri) | 500.01 mi (804.68 km) |
| Duncan to St. Petersburg (Florida) | 1,013.72 mi (1,631.42 km) |
