| Willoughby to Isabela (Puerto Rico) | 1,810.06 mi (2,913.01 km) |
| Willoughby to Iselin (New Jersey) | 376.46 mi (605.86 km) |
| Willoughby to Isla Vista (California) | 2,132.88 mi (3,432.53 km) |
| Willoughby to Issaquah (Washington) | 2,016.44 mi (3,245.15 km) |
| Willoughby to Ithaca (New York) | 257.62 mi (414.60 km) |
| Willoughby to Ives Estates (Florida) | 1,085.82 mi (1,747.45 km) |
| Willoughby to Jackson (Michigan) | 159.36 mi (256.47 km) |
| Willoughby to Jackson (Mississippi) | 806.31 mi (1,297.63 km) |
| Willoughby to Jackson (Missouri) | 528.77 mi (850.98 km) |
| Willoughby to Jackson (Tennessee) | 575.76 mi (926.60 km) |
| Willoughby to Jackson (Wyoming) | 1,492.07 mi (2,401.26 km) |
| Willoughby to Jacksonville (Alabama) | 591.07 mi (951.24 km) |
| Willoughby to Jacksonville (Arkansas) | 745.20 mi (1,199.29 km) |
| Willoughby to Jacksonville (Florida) | 781.84 mi (1,258.25 km) |
| Willoughby to Jacksonville (Illinois) | 480.61 mi (773.47 km) |
