| Duncan to Santa Rosa (California) | 1,398.44 mi (2,250.58 km) |
| Duncan to Santaquin (Utah) | 848.85 mi (1,366.10 km) |
| Duncan to Santee (California) | 1,100.37 mi (1,770.87 km) |
| Duncan to Sapulpa (Oklahoma) | 144.37 mi (232.35 km) |
| Duncan to Saraland (Alabama) | 625.08 mi (1,005.98 km) |
| Duncan to Sarasota (Florida) | 1,036.62 mi (1,668.27 km) |
| Duncan to Sarasota Springs (Florida) | 1,041.28 mi (1,675.78 km) |
| Duncan to Saratoga (California) | 1,358.38 mi (2,186.10 km) |
| Duncan to Saratoga Springs (New York) | 1,420.56 mi (2,286.18 km) |
| Duncan to Saratoga Springs (Utah) | 864.67 mi (1,391.56 km) |
| Duncan to Sartell (Minnesota) | 789.79 mi (1,271.04 km) |
| Duncan to Satellite Beach (Florida) | 1,110.41 mi (1,787.03 km) |
| Duncan to Sauk Rapids (Minnesota) | 789.28 mi (1,270.23 km) |
| Duncan to Sault Ste. Marie (Michigan) | 1,086.46 mi (1,748.49 km) |
| Duncan to Savage (Minnesota) | 745.87 mi (1,200.37 km) |
