| Willimantic to Siloam Springs (Arkansas) | 1,254.58 mi (2,019.04 km) |
| Willimantic to Silver Firs (Washington) | 2,441.46 mi (3,929.15 km) |
| Willimantic to Silver Spring (Maryland) | 315.01 mi (506.95 km) |
| Willimantic to Silver Springs Shores (Florida) | 1,029.48 mi (1,656.79 km) |
| Willimantic to Silverdale (Washington) | 2,468.09 mi (3,972.00 km) |
| Willimantic to Silverton (Oregon) | 2,509.01 mi (4,037.86 km) |
| Willimantic to Simi Valley (California) | 2,553.95 mi (4,110.19 km) |
| Willimantic to Simpsonville (South Carolina) | 727.41 mi (1,170.65 km) |
| Willimantic to Sioux City (Iowa) | 1,236.37 mi (1,989.75 km) |
| Willimantic to Sioux Falls (South Dakota) | 1,248.27 mi (2,008.89 km) |
| Willimantic to Skokie (Illinois) | 798.09 mi (1,284.40 km) |
| Willimantic to Sleepy Hollow (New York) | 96.25 mi (154.89 km) |
| Willimantic to Slidell (Louisiana) | 1,255.88 mi (2,021.15 km) |
| Willimantic to Smithfield (North Carolina) | 541.47 mi (871.41 km) |
| Willimantic to Smithfield (Utah) | 2,022.77 mi (3,255.33 km) |
