| Olesa de Montserrat to Nasaud | 1,174.66 mi (1,890.43 km) |
| Olesa de Montserrat to Navodari | 1,359.01 mi (2,187.11 km) |
| Olesa de Montserrat to Negresti-Oas | 1,139.15 mi (1,833.29 km) |
| Olesa de Montserrat to Nehoiu | 1,247.27 mi (2,007.29 km) |
| Olesa de Montserrat to Ocna Mures | 1,138.18 mi (1,831.73 km) |
| Olesa de Montserrat to Odobesti | 1,285.92 mi (2,069.50 km) |
| Olesa de Montserrat to Odorheiu Secuiesc | 1,205.46 mi (1,940.01 km) |
| Olesa de Montserrat to Oltenita | 1,261.38 mi (2,030.00 km) |
| Olesa de Montserrat to Onesti | 1,274.63 mi (2,051.32 km) |
| Olesa de Montserrat to Oradea | 1,057.57 mi (1,701.99 km) |
| Olesa de Montserrat to Orastie | 1,101.35 mi (1,772.45 km) |
| Olesa de Montserrat to Oravita | 1,021.35 mi (1,643.70 km) |
| Olesa de Montserrat to Orsova | 1,053.79 mi (1,695.91 km) |
| Olesa de Montserrat to Otelu Rosu | 1,057.70 mi (1,702.20 km) |
| Olesa de Montserrat to Otopeni | 1,233.52 mi (1,985.17 km) |
