| Brussels to Navodari | 1,210.32 mi (1,947.82 km) |
| Brussels to Negresti-Oas | 879.88 mi (1,416.03 km) |
| Brussels to Nehoiu | 1,076.78 mi (1,732.91 km) |
| Brussels to Ocna Mures | 939.39 mi (1,511.80 km) |
| Brussels to Odobesti | 1,096.12 mi (1,764.03 km) |
| Brussels to Odorheiu Secuiesc | 1,003.48 mi (1,614.95 km) |
| Brussels to Oltenita | 1,135.06 mi (1,826.71 km) |
| Brussels to Onesti | 1,068.32 mi (1,719.30 km) |
| Brussels to Oradea | 836.23 mi (1,345.78 km) |
| Brussels to Orastie | 928.53 mi (1,494.32 km) |
| Brussels to Oravita | 893.98 mi (1,438.73 km) |
| Brussels to Orsova | 935.02 mi (1,504.77 km) |
| Brussels to Otelu Rosu | 904.25 mi (1,455.26 km) |
| Brussels to Otopeni | 1,094.42 mi (1,761.30 km) |
| Brussels to Ovidiu | 1,209.84 mi (1,947.05 km) |
