| Rouen to Oria | 1,014.01 mi (1,631.90 km) |
| Rouen to Oristano | 754.17 mi (1,213.72 km) |
| Rouen to Orta Nova | 901.57 mi (1,450.93 km) |
| Rouen to Orte | 724.75 mi (1,166.37 km) |
| Rouen to Ortona | 804.20 mi (1,294.23 km) |
| Rouen to Orvieto | 702.21 mi (1,130.09 km) |
| Rouen to Orzinuovi | 498.48 mi (802.23 km) |
| Rouen to Osimo | 717.96 mi (1,155.44 km) |
| Rouen to Ospitaletto | 497.53 mi (800.70 km) |
| Rouen to Ostuni | 1,001.15 mi (1,611.19 km) |
| Rouen to Ottaviano | 879.77 mi (1,415.85 km) |
| Rouen to Ovada | 486.17 mi (782.42 km) |
| Rouen to Ozieri | 722.99 mi (1,163.53 km) |
| Rouen to Paceco | 974.64 mi (1,568.53 km) |
| Rouen to Pachino | 1,124.50 mi (1,809.71 km) |
