| Letchworth to Orbetello | 848.11 mi (1,364.90 km) |
| Letchworth to Oria | 1,159.38 mi (1,865.84 km) |
| Letchworth to Oristano | 934.02 mi (1,503.16 km) |
| Letchworth to Orta Nova | 1,050.53 mi (1,690.66 km) |
| Letchworth to Orte | 882.37 mi (1,420.03 km) |
| Letchworth to Ortona | 953.15 mi (1,533.94 km) |
| Letchworth to Orvieto | 859.68 mi (1,383.53 km) |
| Letchworth to Orzinuovi | 648.06 mi (1,042.96 km) |
| Letchworth to Osimo | 863.79 mi (1,390.13 km) |
| Letchworth to Ospitaletto | 644.70 mi (1,037.54 km) |
| Letchworth to Ostuni | 1,145.51 mi (1,843.51 km) |
| Letchworth to Ottaviano | 1,036.30 mi (1,667.77 km) |
| Letchworth to Ovada | 649.80 mi (1,045.74 km) |
| Letchworth to Ozieri | 900.61 mi (1,449.39 km) |
| Letchworth to Paceco | 1,147.39 mi (1,846.55 km) |
