| Dun Dealgan to Oria | 1,450.98 mi (2,335.12 km) |
| Dun Dealgan to Oristano | 1,198.71 mi (1,929.14 km) |
| Dun Dealgan to Orta Nova | 1,341.28 mi (2,158.58 km) |
| Dun Dealgan to Orte | 1,169.94 mi (1,882.84 km) |
| Dun Dealgan to Ortona | 1,243.78 mi (2,001.66 km) |
| Dun Dealgan to Orvieto | 1,147.28 mi (1,846.37 km) |
| Dun Dealgan to Orzinuovi | 937.83 mi (1,509.29 km) |
| Dun Dealgan to Osimo | 1,154.96 mi (1,858.73 km) |
| Dun Dealgan to Ospitaletto | 935.06 mi (1,504.83 km) |
| Dun Dealgan to Ostuni | 1,437.26 mi (2,313.04 km) |
| Dun Dealgan to Ottaviano | 1,324.58 mi (2,131.70 km) |
| Dun Dealgan to Ovada | 933.72 mi (1,502.68 km) |
| Dun Dealgan to Ozieri | 1,170.07 mi (1,883.05 km) |
| Dun Dealgan to Paceco | 1,423.75 mi (2,291.30 km) |
| Dun Dealgan to Pachino | 1,573.85 mi (2,532.86 km) |
