| Prospect Heights to Kalispell (Montana) | 1,345.95 mi (2,166.10 km) |
| Prospect Heights to Kaneohe (Hawaii) | 4,225.13 mi (6,799.68 km) |
| Prospect Heights to Kankakee (Illinois) | 69.30 mi (111.53 km) |
| Prospect Heights to Kannapolis (North Carolina) | 602.55 mi (969.70 km) |
| Prospect Heights to Kansas City (Kansas) | 412.45 mi (663.77 km) |
| Prospect Heights to Kansas City (Missouri) | 403.83 mi (649.91 km) |
| Prospect Heights to Kapaa (Hawaii) | 4,276.32 mi (6,882.07 km) |
| Prospect Heights to Kapolei (Hawaii) | 4,242.09 mi (6,826.98 km) |
| Prospect Heights to Katy (Texas) | 957.84 mi (1,541.49 km) |
| Prospect Heights to Kaukauna (Wisconsin) | 151.13 mi (243.21 km) |
| Prospect Heights to Kaysville (Utah) | 1,239.78 mi (1,995.23 km) |
| Prospect Heights to Kearney (Missouri) | 386.54 mi (622.07 km) |
| Prospect Heights to Kearney (Nebraska) | 585.82 mi (942.79 km) |
| Prospect Heights to Kearns (Utah) | 1,248.45 mi (2,009.19 km) |
| Prospect Heights to Kearny (New Jersey) | 720.50 mi (1,159.54 km) |
