| Grenada to Orbetello | 5,185.74 mi (8,345.65 km) |
| Grenada to Oria | 5,535.60 mi (8,908.68 km) |
| Grenada to Oristano | 5,162.73 mi (8,308.62 km) |
| Grenada to Orta Nova | 5,420.64 mi (8,723.67 km) |
| Grenada to Orte | 5,235.30 mi (8,425.40 km) |
| Grenada to Ortona | 5,325.05 mi (8,569.84 km) |
| Grenada to Orvieto | 5,213.83 mi (8,390.84 km) |
| Grenada to Orzinuovi | 5,024.18 mi (8,085.63 km) |
| Grenada to Osimo | 5,242.90 mi (8,437.63 km) |
| Grenada to Ospitaletto | 5,024.48 mi (8,086.12 km) |
| Grenada to Ostuni | 5,523.93 mi (8,889.90 km) |
| Grenada to Ottaviano | 5,386.91 mi (8,669.39 km) |
| Grenada to Ovada | 4,996.89 mi (8,041.71 km) |
| Grenada to Ozieri | 5,156.67 mi (8,298.87 km) |
| Grenada to Paceco | 5,413.45 mi (8,712.11 km) |
