| Port Royal to Orbetello | 4,843.76 mi (7,795.28 km) |
| Port Royal to Oria | 5,199.94 mi (8,368.49 km) |
| Port Royal to Oristano | 4,797.33 mi (7,720.56 km) |
| Port Royal to Orta Nova | 5,084.34 mi (8,182.45 km) |
| Port Royal to Orte | 4,896.69 mi (7,880.46 km) |
| Port Royal to Ortona | 4,991.44 mi (8,032.95 km) |
| Port Royal to Orvieto | 4,876.15 mi (7,847.41 km) |
| Port Royal to Orzinuovi | 4,698.92 mi (7,562.18 km) |
| Port Royal to Osimo | 4,914.14 mi (7,908.54 km) |
| Port Royal to Ospitaletto | 4,700.67 mi (7,565.00 km) |
| Port Royal to Ostuni | 5,189.57 mi (8,351.81 km) |
| Port Royal to Ottaviano | 5,043.89 mi (8,117.36 km) |
| Port Royal to Ovada | 4,663.04 mi (7,504.44 km) |
| Port Royal to Ozieri | 4,796.69 mi (7,719.53 km) |
| Port Royal to Paceco | 5,047.08 mi (8,122.49 km) |
