| Willoughby to Frederick (Colorado) | 1,231.64 mi (1,982.13 km) |
| Willoughby to Frederick (Maryland) | 259.47 mi (417.58 km) |
| Willoughby to Fredericksburg (Texas) | 1,249.75 mi (2,011.28 km) |
| Willoughby to Fredericksburg (Virginia) | 310.70 mi (500.02 km) |
| Willoughby to Frederickson (Washington) | 2,033.29 mi (3,272.26 km) |
| Willoughby to Freeport (Illinois) | 424.76 mi (683.59 km) |
| Willoughby to Freeport (New York) | 412.64 mi (664.08 km) |
| Willoughby to Freeport (Texas) | 1,175.45 mi (1,891.70 km) |
| Willoughby to Fremont (California) | 2,159.15 mi (3,474.81 km) |
| Willoughby to Fremont (Nebraska) | 778.92 mi (1,253.55 km) |
| Willoughby to Fremont (Ohio) | 90.58 mi (145.77 km) |
| Willoughby to French Valley (California) | 2,015.24 mi (3,243.21 km) |
| Willoughby to Fresno (California) | 2,064.78 mi (3,322.94 km) |
| Willoughby to Fresno (Texas) | 1,147.75 mi (1,847.12 km) |
| Willoughby to Fridley (Minnesota) | 640.16 mi (1,030.25 km) |
