| Opfikon to Silver Firs (Washington) | 5,217.67 mi (8,397.03 km) |
| Opfikon to Silver Spring (Maryland) | 4,127.47 mi (6,642.52 km) |
| Opfikon to Silver Springs Shores (Florida) | 4,793.04 mi (7,713.65 km) |
| Opfikon to Silverdale (Washington) | 5,242.30 mi (8,436.67 km) |
| Opfikon to Silverton (Oregon) | 5,401.74 mi (8,693.27 km) |
| Opfikon to Simi Valley (California) | 5,918.11 mi (9,524.27 km) |
| Opfikon to Simpsonville (South Carolina) | 4,539.14 mi (7,305.04 km) |
| Opfikon to Sioux City (Iowa) | 4,723.10 mi (7,601.10 km) |
| Opfikon to Sioux Falls (South Dakota) | 4,684.01 mi (7,538.18 km) |
| Opfikon to Skokie (Illinois) | 4,423.78 mi (7,119.38 km) |
| Opfikon to Sleepy Hollow (New York) | 3,907.42 mi (6,288.38 km) |
| Opfikon to Slidell (Louisiana) | 5,067.54 mi (8,155.41 km) |
| Opfikon to Smithfield (North Carolina) | 4,337.53 mi (6,980.57 km) |
| Opfikon to Smithfield (Utah) | 5,274.26 mi (8,488.10 km) |
| Opfikon to Smithville (Missouri) | 4,809.04 mi (7,739.41 km) |
