| Flagstaff to Silver Firs (Washington) | 1,029.26 mi (1,656.43 km) |
| Flagstaff to Silver Spring (Maryland) | 1,913.30 mi (3,079.15 km) |
| Flagstaff to Silver Springs Shores (Florida) | 1,774.82 mi (2,856.29 km) |
| Flagstaff to Silverdale (Washington) | 1,033.02 mi (1,662.49 km) |
| Flagstaff to Silverton (Oregon) | 897.14 mi (1,443.81 km) |
| Flagstaff to Simi Valley (California) | 409.74 mi (659.41 km) |
| Flagstaff to Simpsonville (South Carolina) | 1,656.93 mi (2,666.57 km) |
| Flagstaff to Sioux City (Iowa) | 960.45 mi (1,545.69 km) |
| Flagstaff to Sioux Falls (South Dakota) | 980.17 mi (1,577.44 km) |
| Flagstaff to Skokie (Illinois) | 1,367.78 mi (2,201.22 km) |
| Flagstaff to Sleepy Hollow (New York) | 2,074.66 mi (3,338.85 km) |
| Flagstaff to Slidell (Louisiana) | 1,310.42 mi (2,108.92 km) |
| Flagstaff to Smithfield (North Carolina) | 1,866.04 mi (3,003.09 km) |
| Flagstaff to Smithfield (Utah) | 459.45 mi (739.41 km) |
| Flagstaff to Smithville (Missouri) | 979.18 mi (1,575.83 km) |
