| Willoughby to Indianapolis (Indiana) | 279.64 mi (450.04 km) |
| Willoughby to Indianola (Iowa) | 628.83 mi (1,012.00 km) |
| Willoughby to Indio (California) | 1,966.19 mi (3,164.27 km) |
| Willoughby to Inglewood (California) | 2,068.14 mi (3,328.35 km) |
| Willoughby to Inkster (Michigan) | 107.67 mi (173.27 km) |
| Willoughby to Inver Grove Heights (Minnesota) | 625.57 mi (1,006.75 km) |
| Willoughby to Inwood (New York) | 404.59 mi (651.13 km) |
| Willoughby to Iona (Florida) | 1,045.84 mi (1,683.12 km) |
| Willoughby to Ionia (Michigan) | 208.58 mi (335.67 km) |
| Willoughby to Iowa City (Iowa) | 522.26 mi (840.50 km) |
| Willoughby to Irmo (South Carolina) | 521.38 mi (839.07 km) |
| Willoughby to Irondale (Alabama) | 629.00 mi (1,012.28 km) |
| Willoughby to Ironton (Ohio) | 225.34 mi (362.66 km) |
| Willoughby to Irvine (California) | 2,047.21 mi (3,294.67 km) |
| Willoughby to Irving (Texas) | 1,046.68 mi (1,684.47 km) |
