| Hoeilaart to Navodari | 1,204.26 mi (1,938.08 km) |
| Hoeilaart to Negresti-Oas | 874.34 mi (1,407.12 km) |
| Hoeilaart to Nehoiu | 1,070.75 mi (1,723.21 km) |
| Hoeilaart to Ocna Mures | 933.41 mi (1,502.17 km) |
| Hoeilaart to Odobesti | 1,090.27 mi (1,754.62 km) |
| Hoeilaart to Odorheiu Secuiesc | 997.62 mi (1,605.51 km) |
| Hoeilaart to Oltenita | 1,128.78 mi (1,816.59 km) |
| Hoeilaart to Onesti | 1,062.58 mi (1,710.05 km) |
| Hoeilaart to Oradea | 830.26 mi (1,336.18 km) |
| Hoeilaart to Orastie | 922.33 mi (1,484.34 km) |
| Hoeilaart to Oravita | 887.42 mi (1,428.16 km) |
| Hoeilaart to Orsova | 928.46 mi (1,494.20 km) |
| Hoeilaart to Otelu Rosu | 897.87 mi (1,444.99 km) |
| Hoeilaart to Otopeni | 1,088.18 mi (1,751.25 km) |
| Hoeilaart to Ovidiu | 1,203.77 mi (1,937.28 km) |
