| Chicago (Illinois) to Duncan | 749.39 mi (1,206.03 km) |
| Minneapolis (Minnesota) to Duncan | 761.04 mi (1,224.77 km) |
| Atlanta (Georgia) to Duncan | 773.17 mi (1,244.30 km) |
| Phoenix (Arizona) to Duncan | 813.08 mi (1,308.53 km) |
| Detroit (Michigan) to Duncan | 965.46 mi (1,553.75 km) |
| Las Vegas (Nevada) to Duncan | 982.60 mi (1,581.34 km) |
| Tampa (Florida) to Duncan | 1,018.20 mi (1,638.63 km) |
| San Diego (California) to Duncan | 1,108.50 mi (1,783.95 km) |
| Riverside (California) to Duncan | 1,111.36 mi (1,788.56 km) |
| Los Angeles (California) to Duncan | 1,167.24 mi (1,878.50 km) |
| Washington (District of Columbia) to Duncan | 1,193.40 mi (1,920.60 km) |
| Miami (Florida) to Duncan | 1,216.09 mi (1,957.11 km) |
| Baltimore (Maryland) to Duncan | 1,218.83 mi (1,961.52 km) |
| Philadelphia (Pennsylvania) to Duncan | 1,304.40 mi (2,099.23 km) |
| Brooklyn (New York) to Duncan | 1,373.48 mi (2,210.41 km) |
| New York (New York) to Duncan | 1,375.30 mi (2,213.33 km) |
| San Francisco (California) to Duncan | 1,382.04 mi (2,224.18 km) |
| Queens (New York) to Duncan | 1,382.54 mi (2,224.99 km) |
| Portland (Oregon) to Duncan | 1,503.62 mi (2,419.84 km) |
| Boston (Massachusetts) to Duncan | 1,540.85 mi (2,479.76 km) |
| Seattle (Washington) to Duncan | 1,548.66 mi (2,492.33 km) |
| Dallas (Texas) to Duncan | 137.78 mi (221.74 km) |
| Houston (Texas) to Duncan | 360.35 mi (579.92 km) |
| St. Louis (Missouri) to Duncan | 511.00 mi (822.37 km) |
| Denver (Colorado) to Duncan | 525.80 mi (846.20 km) |
