| Dumfries to Orbetello | 1,098.43 mi (1,767.75 km) |
| Dumfries to Oria | 1,398.17 mi (2,250.14 km) |
| Dumfries to Oristano | 1,188.52 mi (1,912.75 km) |
| Dumfries to Orta Nova | 1,292.32 mi (2,079.78 km) |
| Dumfries to Orte | 1,129.98 mi (1,818.53 km) |
| Dumfries to Ortona | 1,195.59 mi (1,924.12 km) |
| Dumfries to Orvieto | 1,107.35 mi (1,782.11 km) |
| Dumfries to Orzinuovi | 893.74 mi (1,438.33 km) |
| Dumfries to Osimo | 1,105.15 mi (1,778.57 km) |
| Dumfries to Ospitaletto | 889.27 mi (1,431.14 km) |
| Dumfries to Ostuni | 1,383.72 mi (2,226.89 km) |
| Dumfries to Ottaviano | 1,282.59 mi (2,064.13 km) |
| Dumfries to Ovada | 901.22 mi (1,450.38 km) |
| Dumfries to Ozieri | 1,155.13 mi (1,859.01 km) |
| Dumfries to Paceco | 1,400.81 mi (2,254.39 km) |
