| Willoughby to Johnstown (Pennsylvania) | 158.64 mi (255.30 km) |
| Willoughby to Joliet (Illinois) | 348.44 mi (560.75 km) |
| Willoughby to Jonesboro (Arkansas) | 640.93 mi (1,031.47 km) |
| Willoughby to Joplin (Missouri) | 766.36 mi (1,233.34 km) |
| Willoughby to Joppatowne (Maryland) | 306.86 mi (493.84 km) |
| Willoughby to Juana Díaz (Puerto Rico) | 1,852.35 mi (2,981.07 km) |
| Willoughby to Junction City (Kansas) | 831.94 mi (1,338.89 km) |
| Willoughby to Juneau (Alaska) | 2,528.39 mi (4,069.06 km) |
| Willoughby to Jupiter (Florida) | 1,020.11 mi (1,641.71 km) |
| Willoughby to Jupiter Farms (Florida) | 1,019.54 mi (1,640.80 km) |
| Willoughby to Jurupa Valley (California) | 2,021.75 mi (3,253.69 km) |
| Willoughby to Justice (Illinois) | 331.52 mi (533.53 km) |
| Willoughby to Kahului (Hawaii) | 4,516.19 mi (7,268.11 km) |
| Willoughby to Kailua (Hawaii) | 4,559.87 mi (7,338.40 km) |
| Willoughby to Kalamazoo (Michigan) | 219.08 mi (352.57 km) |
