| Willoughby to Kingsville (Texas) | 1,348.06 mi (2,169.50 km) |
| Willoughby to Kinston (North Carolina) | 486.05 mi (782.21 km) |
| Willoughby to Kirkland (Washington) | 2,023.17 mi (3,255.99 km) |
| Willoughby to Kirksville (Missouri) | 591.06 mi (951.21 km) |
| Willoughby to Kirkwood (Missouri) | 520.88 mi (838.27 km) |
| Willoughby to Kiryas Joel (New York) | 375.26 mi (603.92 km) |
| Willoughby to Kissimmee (Florida) | 921.83 mi (1,483.54 km) |
| Willoughby to Klamath Falls (Oregon) | 2,055.60 mi (3,308.16 km) |
| Willoughby to Knightdale (North Carolina) | 433.84 mi (698.20 km) |
| Willoughby to Knik-Fairview (Alaska) | 3,057.24 mi (4,920.16 km) |
| Willoughby to Knoxville (Tennessee) | 415.35 mi (668.43 km) |
| Willoughby to Kokomo (Indiana) | 259.05 mi (416.90 km) |
| Willoughby to Kuna (Idaho) | 1,771.67 mi (2,851.23 km) |
| Willoughby to Kyle (Texas) | 1,220.98 mi (1,964.98 km) |
| Willoughby to La Cañada Flintridge (California) | 2,053.13 mi (3,304.19 km) |
