| Drogheda to Oria | 1,439.00 mi (2,315.84 km) |
| Drogheda to Oristano | 1,182.19 mi (1,902.55 km) |
| Drogheda to Orta Nova | 1,328.87 mi (2,138.61 km) |
| Drogheda to Orte | 1,156.55 mi (1,861.29 km) |
| Drogheda to Ortona | 1,231.34 mi (1,981.65 km) |
| Drogheda to Orvieto | 1,133.90 mi (1,824.84 km) |
| Drogheda to Orzinuovi | 925.19 mi (1,488.95 km) |
| Drogheda to Osimo | 1,142.81 mi (1,839.17 km) |
| Drogheda to Ospitaletto | 922.64 mi (1,484.84 km) |
| Drogheda to Ostuni | 1,425.38 mi (2,293.93 km) |
| Drogheda to Ottaviano | 1,311.31 mi (2,110.35 km) |
| Drogheda to Ovada | 919.71 mi (1,480.13 km) |
| Drogheda to Ozieri | 1,154.01 mi (1,857.19 km) |
| Drogheda to Paceco | 1,408.31 mi (2,266.46 km) |
| Drogheda to Pachino | 1,559.05 mi (2,509.06 km) |
