| Hoek van Holland to Navodari | 1,238.63 mi (1,993.39 km) |
| Hoek van Holland to Negresti-Oas | 900.91 mi (1,449.87 km) |
| Hoek van Holland to Nehoiu | 1,104.97 mi (1,778.27 km) |
| Hoek van Holland to Ocna Mures | 967.25 mi (1,556.64 km) |
| Hoek van Holland to Odobesti | 1,121.36 mi (1,804.65 km) |
| Hoek van Holland to Odorheiu Secuiesc | 1,029.22 mi (1,656.37 km) |
| Hoek van Holland to Oltenita | 1,167.55 mi (1,879.00 km) |
| Hoek van Holland to Onesti | 1,091.94 mi (1,757.31 km) |
| Hoek van Holland to Oradea | 864.19 mi (1,390.77 km) |
| Hoek van Holland to Orastie | 960.13 mi (1,545.18 km) |
| Hoek van Holland to Oravita | 932.27 mi (1,500.35 km) |
| Hoek van Holland to Orsova | 973.14 mi (1,566.11 km) |
| Hoek van Holland to Otelu Rosu | 939.04 mi (1,511.23 km) |
| Hoek van Holland to Otopeni | 1,126.18 mi (1,812.42 km) |
| Hoek van Holland to Ovidiu | 1,238.43 mi (1,993.06 km) |
