| Duffel to Kaneohe (Hawaii) | 7,312.82 mi (11,768.85 km) |
| Duffel to Kankakee (Illinois) | 4,182.25 mi (6,730.69 km) |
| Duffel to Kannapolis (North Carolina) | 4,169.16 mi (6,709.62 km) |
| Duffel to Kansas City (Kansas) | 4,534.43 mi (7,297.45 km) |
| Duffel to Kansas City (Missouri) | 4,527.47 mi (7,286.26 km) |
| Duffel to Kapaa (Hawaii) | 7,285.38 mi (11,724.68 km) |
| Duffel to Kapolei (Hawaii) | 7,320.83 mi (11,781.73 km) |
| Duffel to Katy (Texas) | 5,058.90 mi (8,141.51 km) |
| Duffel to Kaukauna (Wisconsin) | 4,046.58 mi (6,512.33 km) |
| Duffel to Kaysville (Utah) | 5,013.12 mi (8,067.84 km) |
| Duffel to Kearney (Missouri) | 4,508.70 mi (7,256.05 km) |
| Duffel to Kearney (Nebraska) | 4,608.47 mi (7,416.62 km) |
| Duffel to Kearns (Utah) | 5,036.15 mi (8,104.90 km) |
| Duffel to Kearny (New Jersey) | 3,662.22 mi (5,893.77 km) |
| Duffel to Keene (New Hampshire) | 3,494.29 mi (5,623.51 km) |
