| Willoughby to Fortuna (California) | 2,202.60 mi (3,544.73 km) |
| Willoughby to Fortuna Foothills (Arizona) | 1,906.12 mi (3,067.60 km) |
| Willoughby to Foster City (California) | 2,172.91 mi (3,496.96 km) |
| Willoughby to Fostoria (Ohio) | 109.13 mi (175.63 km) |
| Willoughby to Fountain (Colorado) | 1,241.81 mi (1,998.50 km) |
| Willoughby to Fountain Hills (Arizona) | 1,739.69 mi (2,799.75 km) |
| Willoughby to Fountain Inn (South Carolina) | 481.91 mi (775.56 km) |
| Willoughby to Fountain Valley (California) | 2,055.35 mi (3,307.76 km) |
| Willoughby to Fountainebleau (Florida) | 1,098.43 mi (1,767.76 km) |
| Willoughby to Four Corners (Oregon) | 2,079.75 mi (3,347.03 km) |
| Willoughby to Four Corners (Texas) | 1,147.88 mi (1,847.33 km) |
| Willoughby to Four Square Mile (Colorado) | 1,234.19 mi (1,986.24 km) |
| Willoughby to Fox Crossing (Wisconsin) | 399.22 mi (642.49 km) |
| Willoughby to Fox Lake (Illinois) | 351.76 mi (566.11 km) |
| Willoughby to Framingham (Massachusetts) | 513.93 mi (827.09 km) |
