| Prestonpans to Orbetello | 1,127.54 mi (1,814.60 km) |
| Prestonpans to Oria | 1,417.04 mi (2,280.51 km) |
| Prestonpans to Oristano | 1,227.61 mi (1,975.65 km) |
| Prestonpans to Orta Nova | 1,313.52 mi (2,113.91 km) |
| Prestonpans to Orte | 1,156.29 mi (1,860.87 km) |
| Prestonpans to Ortona | 1,217.56 mi (1,959.48 km) |
| Prestonpans to Orvieto | 1,133.78 mi (1,824.65 km) |
| Prestonpans to Orzinuovi | 919.38 mi (1,479.60 km) |
| Prestonpans to Osimo | 1,126.70 mi (1,813.25 km) |
| Prestonpans to Ospitaletto | 914.11 mi (1,471.12 km) |
| Prestonpans to Ostuni | 1,402.25 mi (2,256.71 km) |
| Prestonpans to Ottaviano | 1,307.30 mi (2,103.90 km) |
| Prestonpans to Ovada | 932.27 mi (1,500.34 km) |
| Prestonpans to Ozieri | 1,192.43 mi (1,919.03 km) |
| Prestonpans to Paceco | 1,433.92 mi (2,307.67 km) |
