| Llantrisant to Fortuna Foothills (Arizona) | 5,280.24 mi (8,497.73 km) |
| Llantrisant to Foster City (California) | 5,262.67 mi (8,469.45 km) |
| Llantrisant to Fostoria (Ohio) | 3,688.74 mi (5,936.45 km) |
| Llantrisant to Fountain (Colorado) | 4,613.92 mi (7,425.38 km) |
| Llantrisant to Fountain Hills (Arizona) | 5,135.18 mi (8,264.27 km) |
| Llantrisant to Fountain Inn (South Carolina) | 3,937.25 mi (6,336.39 km) |
| Llantrisant to Fountain Valley (California) | 5,342.63 mi (8,598.13 km) |
| Llantrisant to Fountainebleau (Florida) | 4,296.03 mi (6,913.79 km) |
| Llantrisant to Four Corners (Oregon) | 4,863.79 mi (7,827.51 km) |
| Llantrisant to Four Corners (Texas) | 4,734.67 mi (7,619.71 km) |
| Llantrisant to Four Square Mile (Colorado) | 4,570.02 mi (7,354.74 km) |
| Llantrisant to Fox Crossing (Wisconsin) | 3,748.51 mi (6,032.64 km) |
| Llantrisant to Fox Lake (Illinois) | 3,818.36 mi (6,145.06 km) |
| Llantrisant to Framingham (Massachusetts) | 3,154.68 mi (5,076.97 km) |
| Llantrisant to Franconia (Virginia) | 3,541.90 mi (5,700.14 km) |
