| Gretna to Kaneohe (Hawaii) | 4,201.54 mi (6,761.73 km) |
| Gretna to Kankakee (Illinois) | 782.93 mi (1,260.01 km) |
| Gretna to Kannapolis (North Carolina) | 668.30 mi (1,075.52 km) |
| Gretna to Kansas City (Kansas) | 690.09 mi (1,110.60 km) |
| Gretna to Kansas City (Missouri) | 686.02 mi (1,104.04 km) |
| Gretna to Kapaa (Hawaii) | 4,275.03 mi (6,880.00 km) |
| Gretna to Kapolei (Hawaii) | 4,219.74 mi (6,791.02 km) |
| Gretna to Katy (Texas) | 346.67 mi (557.90 km) |
| Gretna to Kaukauna (Wisconsin) | 997.48 mi (1,605.29 km) |
| Gretna to Kaysville (Utah) | 1,445.58 mi (2,326.44 km) |
| Gretna to Kearney (Missouri) | 696.79 mi (1,121.37 km) |
| Gretna to Kearney (Nebraska) | 901.75 mi (1,451.22 km) |
| Gretna to Kearns (Utah) | 1,437.75 mi (2,313.83 km) |
| Gretna to Kearny (New Jersey) | 1,166.13 mi (1,876.71 km) |
| Gretna to Keene (New Hampshire) | 1,331.04 mi (2,142.10 km) |
