| Webster Groves to Stony Brook (New York) | 927.50 mi (1,492.67 km) |
| Webster Groves to Storm Lake (Iowa) | 378.07 mi (608.44 km) |
| Webster Groves to Storrs (Connecticut) | 978.97 mi (1,575.50 km) |
| Webster Groves to Stoughton (Wisconsin) | 305.46 mi (491.58 km) |
| Webster Groves to Stow (Ohio) | 505.36 mi (813.30 km) |
| Webster Groves to Streamwood (Illinois) | 263.52 mi (424.10 km) |
| Webster Groves to Streator (Illinois) | 193.09 mi (310.75 km) |
| Webster Groves to Streetsboro (Ohio) | 511.10 mi (822.53 km) |
| Webster Groves to Strongsville (Ohio) | 488.89 mi (786.79 km) |
| Webster Groves to Stuart (Florida) | 980.12 mi (1,577.35 km) |
| Webster Groves to Stuarts Draft (Virginia) | 614.59 mi (989.08 km) |
| Webster Groves to Sturgis (Michigan) | 342.14 mi (550.63 km) |
| Webster Groves to Suamico (Wisconsin) | 434.25 mi (698.85 km) |
| Webster Groves to Sudley (Virginia) | 693.04 mi (1,115.35 km) |
| Webster Groves to Suffern (New York) | 876.14 mi (1,410.02 km) |
