| Difficult Run to Fenton | 3,564.73 mi (5,736.87 km) |
| Difficult Run to Fern Down | 3,619.78 mi (5,825.47 km) |
| Difficult Run to Ferryhill | 3,556.74 mi (5,724.02 km) |
| Difficult Run to Finchley | 3,673.08 mi (5,911.25 km) |
| Difficult Run to Fleet | 3,653.07 mi (5,879.05 km) |
| Difficult Run to Fleetwood | 3,513.72 mi (5,654.78 km) |
| Difficult Run to Flint | 3,521.00 mi (5,666.49 km) |
| Difficult Run to Flitwick | 3,651.74 mi (5,876.90 km) |
| Difficult Run to Flixton | 3,546.90 mi (5,708.19 km) |
| Difficult Run to Folkestone | 3,739.99 mi (6,018.93 km) |
| Difficult Run to Forfar | 3,473.24 mi (5,589.64 km) |
| Difficult Run to Formby | 3,518.09 mi (5,661.82 km) |
| Difficult Run to Forres | 3,432.36 mi (5,523.85 km) |
| Difficult Run to Fort William | 3,388.54 mi (5,453.32 km) |
| Difficult Run to Fraserburgh | 3,489.51 mi (5,615.83 km) |
