| Sintra to Smyrna (Delaware) | 3,468.94 mi (5,582.72 km) |
| Sintra to Smyrna (Georgia) | 4,075.59 mi (6,559.02 km) |
| Sintra to Smyrna (Tennessee) | 4,106.94 mi (6,609.49 km) |
| Sintra to Snellville (Georgia) | 4,049.93 mi (6,517.73 km) |
| Sintra to Snoqualmie (Washington) | 5,172.19 mi (8,323.84 km) |
| Sintra to Snyder (Texas) | 4,923.89 mi (7,924.24 km) |
| Sintra to Socastee (South Carolina) | 3,801.13 mi (6,117.33 km) |
| Sintra to Socorro (Texas) | 5,220.98 mi (8,402.36 km) |
| Sintra to Soddy-Daisy (Tennessee) | 4,062.97 mi (6,538.72 km) |
| Sintra to Solana Beach (California) | 5,659.77 mi (9,108.52 km) |
| Sintra to Soledad (California) | 5,671.06 mi (9,126.69 km) |
| Sintra to Solon (Ohio) | 3,698.33 mi (5,951.89 km) |
| Sintra to Somers Point (New Jersey) | 3,418.57 mi (5,501.66 km) |
| Sintra to Somerset (Kentucky) | 3,977.07 mi (6,400.48 km) |
| Sintra to Somerset (New Jersey) | 3,383.93 mi (5,445.90 km) |
