| Willebroek to Silver Firs (Washington) | 4,903.99 mi (7,892.21 km) |
| Willebroek to Silver Spring (Maryland) | 3,852.47 mi (6,199.96 km) |
| Willebroek to Silver Springs Shores (Florida) | 4,532.50 mi (7,294.36 km) |
| Willebroek to Silverdale (Washington) | 4,928.70 mi (7,931.97 km) |
| Willebroek to Silverton (Oregon) | 5,087.70 mi (8,187.86 km) |
| Willebroek to Simi Valley (California) | 5,605.33 mi (9,020.91 km) |
| Willebroek to Simpsonville (South Carolina) | 4,265.40 mi (6,864.49 km) |
| Willebroek to Sioux City (Iowa) | 4,419.17 mi (7,111.97 km) |
| Willebroek to Sioux Falls (South Dakota) | 4,378.73 mi (7,046.89 km) |
| Willebroek to Skokie (Illinois) | 4,128.63 mi (6,644.39 km) |
| Willebroek to Sleepy Hollow (New York) | 3,632.06 mi (5,845.24 km) |
| Willebroek to Slidell (Louisiana) | 4,789.90 mi (7,708.61 km) |
| Willebroek to Smithfield (North Carolina) | 4,068.75 mi (6,548.03 km) |
| Willebroek to Smithfield (Utah) | 4,961.61 mi (7,984.93 km) |
| Willebroek to Smithville (Missouri) | 4,510.45 mi (7,258.87 km) |
