| Duffel to Frederick (Maryland) | 3,853.85 mi (6,202.17 km) |
| Duffel to Fredericksburg (Texas) | 5,149.95 mi (8,288.05 km) |
| Duffel to Fredericksburg (Virginia) | 3,908.77 mi (6,290.56 km) |
| Duffel to Frederickson (Washington) | 4,956.23 mi (7,976.28 km) |
| Duffel to Freeport (Illinois) | 4,191.03 mi (6,744.80 km) |
| Duffel to Freeport (New York) | 3,645.05 mi (5,866.13 km) |
| Duffel to Freeport (Texas) | 5,085.06 mi (8,183.62 km) |
| Duffel to Fremont (California) | 5,510.73 mi (8,868.66 km) |
| Duffel to Fremont (Nebraska) | 4,479.75 mi (7,209.46 km) |
| Duffel to Fremont (Ohio) | 3,989.88 mi (6,421.10 km) |
| Duffel to French Valley (California) | 5,596.61 mi (9,006.88 km) |
| Duffel to Fresno (California) | 5,491.84 mi (8,838.26 km) |
| Duffel to Fresno (Texas) | 5,058.17 mi (8,140.33 km) |
| Duffel to Fridley (Minnesota) | 4,186.09 mi (6,736.86 km) |
| Duffel to Friendly (Maryland) | 3,866.48 mi (6,222.50 km) |
