| Southborough to Kaneohe (Hawaii) | 7,248.58 mi (11,665.47 km) |
| Southborough to Kankakee (Illinois) | 4,018.81 mi (6,467.66 km) |
| Southborough to Kannapolis (North Carolina) | 3,994.09 mi (6,427.87 km) |
| Southborough to Kansas City (Kansas) | 4,375.04 mi (7,040.95 km) |
| Southborough to Kansas City (Missouri) | 4,367.89 mi (7,029.44 km) |
| Southborough to Kapaa (Hawaii) | 7,226.05 mi (11,629.20 km) |
| Southborough to Kapolei (Hawaii) | 7,257.33 mi (11,679.55 km) |
| Southborough to Katy (Texas) | 4,890.66 mi (7,870.76 km) |
| Southborough to Kaukauna (Wisconsin) | 3,887.79 mi (6,256.80 km) |
| Southborough to Kaysville (Utah) | 4,876.74 mi (7,848.35 km) |
| Southborough to Kearney (Missouri) | 4,349.22 mi (6,999.39 km) |
| Southborough to Kearney (Nebraska) | 4,455.70 mi (7,170.76 km) |
| Southborough to Kearns (Utah) | 4,899.34 mi (7,884.73 km) |
| Southborough to Kearny (New Jersey) | 3,487.87 mi (5,613.19 km) |
| Southborough to Keene (New Hampshire) | 3,321.19 mi (5,344.94 km) |
