| Southborough to San Diego (California) | 5,502.39 mi (8,855.24 km) |
| Southborough to San Diego Country Estates (California) | 5,481.24 mi (8,821.21 km) |
| Southborough to San Dimas (California) | 5,451.96 mi (8,774.09 km) |
| Southborough to San Fernando (California) | 5,461.80 mi (8,789.92 km) |
| Southborough to San Francisco (California) | 5,385.00 mi (8,666.31 km) |
| Southborough to San Gabriel (California) | 5,462.06 mi (8,790.34 km) |
| Southborough to San Germán (Puerto Rico) | 4,273.69 mi (6,877.84 km) |
| Southborough to San Jacinto (California) | 5,443.16 mi (8,759.93 km) |
| Southborough to San Jose (California) | 5,393.70 mi (8,680.33 km) |
| Southborough to San Juan (Puerto Rico) | 4,214.80 mi (6,783.06 km) |
| Southborough to San Juan (Texas) | 5,171.45 mi (8,322.64 km) |
| Southborough to San Juan Capistrano (California) | 5,481.62 mi (8,821.81 km) |
| Southborough to San Leandro (California) | 5,379.39 mi (8,657.29 km) |
| Southborough to San Lorenzo (California) | 5,380.58 mi (8,659.21 km) |
| Southborough to San Luis (Arizona) | 5,441.23 mi (8,756.81 km) |
