| Haarlem to Navodari | 1,226.03 mi (1,973.10 km) |
| Haarlem to Negresti-Oas | 885.73 mi (1,425.44 km) |
| Haarlem to Nehoiu | 1,092.48 mi (1,758.17 km) |
| Haarlem to Ocna Mures | 954.86 mi (1,536.69 km) |
| Haarlem to Odobesti | 1,107.56 mi (1,782.45 km) |
| Haarlem to Odorheiu Secuiesc | 1,015.79 mi (1,634.75 km) |
| Haarlem to Oltenita | 1,156.92 mi (1,861.88 km) |
| Haarlem to Onesti | 1,077.51 mi (1,734.08 km) |
| Haarlem to Oradea | 852.06 mi (1,371.25 km) |
| Haarlem to Orastie | 949.43 mi (1,527.96 km) |
| Haarlem to Oravita | 924.78 mi (1,488.29 km) |
| Haarlem to Orsova | 965.48 mi (1,553.79 km) |
| Haarlem to Otelu Rosu | 929.85 mi (1,496.45 km) |
| Haarlem to Otopeni | 1,115.27 mi (1,794.86 km) |
| Haarlem to Ovidiu | 1,225.94 mi (1,972.96 km) |
