| Estoril to Silver Firs (Washington) | 5,172.19 mi (8,323.83 km) |
| Estoril to Silver Spring (Maryland) | 3,548.67 mi (5,711.03 km) |
| Estoril to Silver Springs Shores (Florida) | 4,109.29 mi (6,613.26 km) |
| Estoril to Silverdale (Washington) | 5,199.70 mi (8,368.12 km) |
| Estoril to Silverton (Oregon) | 5,327.33 mi (8,573.52 km) |
| Estoril to Simi Valley (California) | 5,668.86 mi (9,123.15 km) |
| Estoril to Simpsonville (South Carolina) | 3,935.39 mi (6,333.41 km) |
| Estoril to Sioux City (Iowa) | 4,359.01 mi (7,015.15 km) |
| Estoril to Sioux Falls (South Dakota) | 4,339.20 mi (6,983.27 km) |
| Estoril to Skokie (Illinois) | 3,979.79 mi (6,404.85 km) |
| Estoril to Sleepy Hollow (New York) | 3,341.39 mi (5,377.45 km) |
| Estoril to Slidell (Louisiana) | 4,467.82 mi (7,190.26 km) |
| Estoril to Smithfield (North Carolina) | 3,713.43 mi (5,976.18 km) |
| Estoril to Smithfield (Utah) | 5,045.63 mi (8,120.16 km) |
| Estoril to Smithville (Missouri) | 4,381.48 mi (7,051.30 km) |
