| Willoughby to Kalispell (Montana) | 1,658.81 mi (2,669.60 km) |
| Willoughby to Kaneohe (Hawaii) | 4,561.87 mi (7,341.62 km) |
| Willoughby to Kankakee (Illinois) | 336.75 mi (541.95 km) |
| Willoughby to Kannapolis (North Carolina) | 428.28 mi (689.25 km) |
| Willoughby to Kansas City (Kansas) | 722.35 mi (1,162.51 km) |
| Willoughby to Kansas City (Missouri) | 712.66 mi (1,146.92 km) |
| Willoughby to Kapaa (Hawaii) | 4,612.86 mi (7,423.68 km) |
| Willoughby to Kapolei (Hawaii) | 4,578.83 mi (7,368.91 km) |
| Willoughby to Katy (Texas) | 1,148.38 mi (1,848.14 km) |
| Willoughby to Kaukauna (Wisconsin) | 391.25 mi (629.66 km) |
| Willoughby to Kaysville (Utah) | 1,576.45 mi (2,537.04 km) |
| Willoughby to Kearney (Missouri) | 697.88 mi (1,123.14 km) |
| Willoughby to Kearney (Nebraska) | 919.93 mi (1,480.49 km) |
| Willoughby to Kearns (Utah) | 1,585.20 mi (2,551.14 km) |
| Willoughby to Kearny (New Jersey) | 383.76 mi (617.61 km) |
