| West Mifflin to Smithville (Missouri) | 779.70 mi (1,254.81 km) |
| West Mifflin to Smyrna (Delaware) | 239.65 mi (385.69 km) |
| West Mifflin to Smyrna (Georgia) | 515.44 mi (829.52 km) |
| West Mifflin to Smyrna (Tennessee) | 470.15 mi (756.63 km) |
| West Mifflin to Snellville (Georgia) | 502.60 mi (808.86 km) |
| West Mifflin to Snoqualmie (Washington) | 2,116.78 mi (3,406.63 km) |
| West Mifflin to Snyder (Texas) | 1,275.90 mi (2,053.36 km) |
| West Mifflin to Socastee (South Carolina) | 463.57 mi (746.05 km) |
| West Mifflin to Socorro (Texas) | 1,583.91 mi (2,549.05 km) |
| West Mifflin to Soddy-Daisy (Tennessee) | 454.64 mi (731.67 km) |
| West Mifflin to Solana Beach (California) | 2,114.61 mi (3,403.13 km) |
| West Mifflin to Soledad (California) | 2,239.31 mi (3,603.82 km) |
| West Mifflin to Solon (Ohio) | 107.05 mi (172.29 km) |
| West Mifflin to Somers Point (New Jersey) | 290.23 mi (467.08 km) |
| West Mifflin to Somerset (Kentucky) | 339.73 mi (546.75 km) |
