| Webster Groves to Smithville (Missouri) | 233.35 mi (375.54 km) |
| Webster Groves to Smyrna (Delaware) | 793.09 mi (1,276.36 km) |
| Webster Groves to Smyrna (Georgia) | 460.63 mi (741.32 km) |
| Webster Groves to Smyrna (Tennessee) | 277.46 mi (446.52 km) |
| Webster Groves to Snellville (Georgia) | 481.56 mi (774.99 km) |
| Webster Groves to Snoqualmie (Washington) | 1,691.15 mi (2,721.64 km) |
| Webster Groves to Snyder (Texas) | 717.56 mi (1,154.80 km) |
| Webster Groves to Socastee (South Carolina) | 717.16 mi (1,154.16 km) |
| Webster Groves to Socorro (Texas) | 1,017.09 mi (1,636.85 km) |
| Webster Groves to Soddy-Daisy (Tennessee) | 367.05 mi (590.71 km) |
| Webster Groves to Solana Beach (California) | 1,550.38 mi (2,495.09 km) |
| Webster Groves to Soledad (California) | 1,696.68 mi (2,730.55 km) |
| Webster Groves to Solon (Ohio) | 509.71 mi (820.31 km) |
| Webster Groves to Somers Point (New Jersey) | 846.60 mi (1,362.46 km) |
| Webster Groves to Somerset (Kentucky) | 330.10 mi (531.25 km) |
