| Horsforth to Orbetello | 982.44 mi (1,581.08 km) |
| Horsforth to Oria | 1,283.82 mi (2,066.10 km) |
| Horsforth to Oristano | 1,074.60 mi (1,729.41 km) |
| Horsforth to Orta Nova | 1,177.33 mi (1,894.73 km) |
| Horsforth to Orte | 1,014.13 mi (1,632.08 km) |
| Horsforth to Ortona | 1,080.45 mi (1,738.82 km) |
| Horsforth to Orvieto | 991.49 mi (1,595.65 km) |
| Horsforth to Orzinuovi | 778.02 mi (1,252.11 km) |
| Horsforth to Osimo | 990.16 mi (1,593.51 km) |
| Horsforth to Ospitaletto | 773.68 mi (1,245.12 km) |
| Horsforth to Ostuni | 1,269.48 mi (2,043.03 km) |
| Horsforth to Ottaviano | 1,166.90 mi (1,877.95 km) |
| Horsforth to Ovada | 785.28 mi (1,263.78 km) |
| Horsforth to Ozieri | 1,040.51 mi (1,674.53 km) |
| Horsforth to Paceco | 1,285.17 mi (2,068.29 km) |
