| Rotterdam to Navodari | 1,222.20 mi (1,966.95 km) |
| Rotterdam to Negresti-Oas | 884.54 mi (1,423.53 km) |
| Rotterdam to Nehoiu | 1,088.54 mi (1,751.83 km) |
| Rotterdam to Ocna Mures | 950.82 mi (1,530.20 km) |
| Rotterdam to Odobesti | 1,104.94 mi (1,778.23 km) |
| Rotterdam to Odorheiu Secuiesc | 1,012.80 mi (1,629.94 km) |
| Rotterdam to Oltenita | 1,151.15 mi (1,852.60 km) |
| Rotterdam to Onesti | 1,075.54 mi (1,730.92 km) |
| Rotterdam to Oradea | 847.76 mi (1,364.33 km) |
| Rotterdam to Orastie | 943.73 mi (1,518.78 km) |
| Rotterdam to Oravita | 916.02 mi (1,474.19 km) |
| Rotterdam to Orsova | 956.88 mi (1,539.94 km) |
| Rotterdam to Otelu Rosu | 922.69 mi (1,484.92 km) |
| Rotterdam to Otopeni | 1,109.77 mi (1,786.01 km) |
| Rotterdam to Ovidiu | 1,222.00 mi (1,966.61 km) |
