| Biddeford to Orbetello | 3,951.31 mi (6,359.01 km) |
| Biddeford to Oria | 4,302.78 mi (6,924.66 km) |
| Biddeford to Oristano | 3,926.43 mi (6,318.98 km) |
| Biddeford to Orta Nova | 4,187.55 mi (6,739.22 km) |
| Biddeford to Orte | 4,001.54 mi (6,439.85 km) |
| Biddeford to Ortona | 4,092.49 mi (6,586.22 km) |
| Biddeford to Orvieto | 3,980.24 mi (6,405.58 km) |
| Biddeford to Orzinuovi | 3,793.47 mi (6,105.00 km) |
| Biddeford to Osimo | 4,011.49 mi (6,455.87 km) |
| Biddeford to Ospitaletto | 3,794.20 mi (6,106.18 km) |
| Biddeford to Ostuni | 4,291.41 mi (6,906.35 km) |
| Biddeford to Ottaviano | 4,152.46 mi (6,682.74 km) |
| Biddeford to Ovada | 3,763.90 mi (6,057.42 km) |
| Biddeford to Ozieri | 3,920.39 mi (6,309.26 km) |
| Biddeford to Paceco | 4,177.14 mi (6,722.46 km) |
