| Rennes to Navodari | 1,461.86 mi (2,352.64 km) |
| Rennes to Negresti-Oas | 1,155.74 mi (1,859.98 km) |
| Rennes to Nehoiu | 1,331.35 mi (2,142.60 km) |
| Rennes to Ocna Mures | 1,198.11 mi (1,928.17 km) |
| Rennes to Odobesti | 1,357.70 mi (2,185.00 km) |
| Rennes to Odorheiu Secuiesc | 1,265.82 mi (2,037.14 km) |
| Rennes to Oltenita | 1,376.59 mi (2,215.40 km) |
| Rennes to Onesti | 1,334.31 mi (2,147.36 km) |
| Rennes to Oradea | 1,097.71 mi (1,766.59 km) |
| Rennes to Orastie | 1,177.88 mi (1,895.61 km) |
| Rennes to Oravita | 1,125.22 mi (1,810.87 km) |
| Rennes to Orsova | 1,165.32 mi (1,875.41 km) |
| Rennes to Otelu Rosu | 1,145.56 mi (1,843.59 km) |
| Rennes to Otopeni | 1,338.94 mi (2,154.81 km) |
| Rennes to Ovidiu | 1,460.68 mi (2,350.73 km) |
