| Duffel to Silver Firs (Washington) | 4,905.81 mi (7,895.14 km) |
| Duffel to Silver Spring (Maryland) | 3,857.67 mi (6,208.32 km) |
| Duffel to Silver Springs Shores (Florida) | 4,538.07 mi (7,303.32 km) |
| Duffel to Silverdale (Washington) | 4,930.49 mi (7,934.86 km) |
| Duffel to Silverton (Oregon) | 5,089.65 mi (8,191.01 km) |
| Duffel to Simi Valley (California) | 5,608.25 mi (9,025.60 km) |
| Duffel to Simpsonville (South Carolina) | 4,270.62 mi (6,872.90 km) |
| Duffel to Sioux City (Iowa) | 4,423.06 mi (7,118.22 km) |
| Duffel to Sioux Falls (South Dakota) | 4,382.51 mi (7,052.98 km) |
| Duffel to Skokie (Illinois) | 4,133.04 mi (6,651.49 km) |
| Duffel to Sleepy Hollow (New York) | 3,637.26 mi (5,853.60 km) |
| Duffel to Slidell (Louisiana) | 4,794.99 mi (7,716.80 km) |
| Duffel to Smithfield (North Carolina) | 4,074.13 mi (6,556.67 km) |
| Duffel to Smithfield (Utah) | 4,964.55 mi (7,989.67 km) |
| Duffel to Smithville (Missouri) | 4,514.67 mi (7,265.66 km) |
