| South Portland to Kalispell (Montana) | 2,110.54 mi (3,396.59 km) |
| South Portland to Kaneohe (Hawaii) | 5,089.89 mi (8,191.38 km) |
| South Portland to Kankakee (Illinois) | 912.22 mi (1,468.07 km) |
| South Portland to Kannapolis (North Carolina) | 787.17 mi (1,266.83 km) |
| South Portland to Kansas City (Kansas) | 1,300.39 mi (2,092.77 km) |
| South Portland to Kansas City (Missouri) | 1,290.91 mi (2,077.52 km) |
| South Portland to Kapaa (Hawaii) | 5,134.17 mi (8,262.64 km) |
| South Portland to Kapolei (Hawaii) | 5,106.34 mi (8,217.86 km) |
| South Portland to Katy (Texas) | 1,696.63 mi (2,730.46 km) |
| South Portland to Kaukauna (Wisconsin) | 893.38 mi (1,437.76 km) |
| South Portland to Kaysville (Utah) | 2,112.97 mi (3,400.50 km) |
| South Portland to Kearney (Missouri) | 1,275.39 mi (2,052.54 km) |
| South Portland to Kearney (Nebraska) | 1,480.86 mi (2,383.21 km) |
| South Portland to Kearns (Utah) | 2,124.73 mi (3,419.43 km) |
| South Portland to Kearny (New Jersey) | 279.23 mi (449.37 km) |
