| Idanha-a-Nova to Silver Firs (Washington) | 5,181.06 mi (8,338.11 km) |
| Idanha-a-Nova to Silver Spring (Maryland) | 3,622.35 mi (5,829.60 km) |
| Idanha-a-Nova to Silver Springs Shores (Florida) | 4,199.84 mi (6,758.99 km) |
| Idanha-a-Nova to Silverdale (Washington) | 5,208.32 mi (8,381.98 km) |
| Idanha-a-Nova to Silverton (Oregon) | 5,340.77 mi (8,595.15 km) |
| Idanha-a-Nova to Simi Valley (California) | 5,707.02 mi (9,184.56 km) |
| Idanha-a-Nova to Simpsonville (South Carolina) | 4,014.26 mi (6,460.33 km) |
| Idanha-a-Nova to Sioux City (Iowa) | 4,406.87 mi (7,092.17 km) |
| Idanha-a-Nova to Sioux Falls (South Dakota) | 4,384.35 mi (7,055.92 km) |
| Idanha-a-Nova to Skokie (Illinois) | 4,036.76 mi (6,496.54 km) |
| Idanha-a-Nova to Sleepy Hollow (New York) | 3,412.21 mi (5,491.42 km) |
| Idanha-a-Nova to Slidell (Louisiana) | 4,548.13 mi (7,319.51 km) |
| Idanha-a-Nova to Smithfield (North Carolina) | 3,794.22 mi (6,106.21 km) |
| Idanha-a-Nova to Smithfield (Utah) | 5,078.39 mi (8,172.88 km) |
| Idanha-a-Nova to Smithville (Missouri) | 4,438.07 mi (7,142.38 km) |
