| Duncan to San Diego (California) | 1,108.50 mi (1,783.95 km) |
| Duncan to San Diego Country Estates (California) | 1,087.07 mi (1,749.47 km) |
| Duncan to San Dimas (California) | 1,133.37 mi (1,823.98 km) |
| Duncan to San Fernando (California) | 1,167.45 mi (1,878.83 km) |
| Duncan to San Francisco (California) | 1,382.04 mi (2,224.18 km) |
| Duncan to San Gabriel (California) | 1,149.94 mi (1,850.65 km) |
| Duncan to San Germán (Puerto Rico) | 2,210.91 mi (3,558.11 km) |
| Duncan to San Jacinto (California) | 1,089.77 mi (1,753.82 km) |
| Duncan to San Jose (California) | 1,348.61 mi (2,170.38 km) |
| Duncan to San Juan (Puerto Rico) | 2,249.80 mi (3,620.70 km) |
| Duncan to San Juan (Texas) | 577.13 mi (928.80 km) |
| Duncan to San Juan Capistrano (California) | 1,130.53 mi (1,819.41 km) |
| Duncan to San Leandro (California) | 1,366.37 mi (2,198.96 km) |
| Duncan to San Lorenzo (California) | 1,364.84 mi (2,196.50 km) |
| Duncan to San Luis (Arizona) | 976.19 mi (1,571.03 km) |
