| Westmont to Siloam Springs (Arkansas) | 1,349.81 mi (2,172.30 km) |
| Westmont to Silver Firs (Washington) | 982.34 mi (1,580.92 km) |
| Westmont to Silver Spring (Maryland) | 2,300.27 mi (3,701.93 km) |
| Westmont to Silver Springs Shores (Florida) | 2,151.72 mi (3,462.87 km) |
| Westmont to Silverdale (Washington) | 975.14 mi (1,569.34 km) |
| Westmont to Silverton (Oregon) | 800.38 mi (1,288.09 km) |
| Westmont to Simi Valley (California) | 34.02 mi (54.75 km) |
| Westmont to Simpsonville (South Carolina) | 2,046.12 mi (3,292.91 km) |
| Westmont to Sioux City (Iowa) | 1,322.85 mi (2,128.91 km) |
| Westmont to Sioux Falls (South Dakota) | 1,332.50 mi (2,144.46 km) |
| Westmont to Skokie (Illinois) | 1,744.74 mi (2,807.89 km) |
| Westmont to Sleepy Hollow (New York) | 2,457.17 mi (3,954.43 km) |
| Westmont to Slidell (Louisiana) | 1,682.42 mi (2,707.59 km) |
| Westmont to Smithfield (North Carolina) | 2,255.77 mi (3,630.32 km) |
| Westmont to Smithfield (Utah) | 649.23 mi (1,044.83 km) |
