| Douarnenez to Oria | 1,200.49 mi (1,932.01 km) |
| Douarnenez to Oristano | 853.76 mi (1,373.99 km) |
| Douarnenez to Orta Nova | 1,085.05 mi (1,746.21 km) |
| Douarnenez to Orte | 898.59 mi (1,446.14 km) |
| Douarnenez to Ortona | 990.85 mi (1,594.62 km) |
| Douarnenez to Orvieto | 877.38 mi (1,412.00 km) |
| Douarnenez to Orzinuovi | 699.30 mi (1,125.42 km) |
| Douarnenez to Osimo | 912.85 mi (1,469.10 km) |
| Douarnenez to Ospitaletto | 701.99 mi (1,129.74 km) |
| Douarnenez to Ostuni | 1,189.53 mi (1,914.36 km) |
| Douarnenez to Ottaviano | 1,049.79 mi (1,689.47 km) |
| Douarnenez to Ovada | 662.09 mi (1,065.52 km) |
| Douarnenez to Ozieri | 836.57 mi (1,346.33 km) |
| Douarnenez to Paceco | 1,097.84 mi (1,766.81 km) |
| Douarnenez to Pachino | 1,258.89 mi (2,025.99 km) |
