| Grimbergen to Navodari | 1,210.31 mi (1,947.80 km) |
| Grimbergen to Negresti-Oas | 879.20 mi (1,414.94 km) |
| Grimbergen to Nehoiu | 1,076.74 mi (1,732.84 km) |
| Grimbergen to Ocna Mures | 939.29 mi (1,511.65 km) |
| Grimbergen to Odobesti | 1,095.83 mi (1,763.57 km) |
| Grimbergen to Odorheiu Secuiesc | 1,003.22 mi (1,614.53 km) |
| Grimbergen to Oltenita | 1,135.40 mi (1,827.24 km) |
| Grimbergen to Onesti | 1,067.90 mi (1,718.61 km) |
| Grimbergen to Oradea | 836.11 mi (1,345.59 km) |
| Grimbergen to Orastie | 928.75 mi (1,494.68 km) |
| Grimbergen to Oravita | 894.78 mi (1,440.01 km) |
| Grimbergen to Orsova | 935.81 mi (1,506.04 km) |
| Grimbergen to Otelu Rosu | 904.74 mi (1,456.04 km) |
| Grimbergen to Otopeni | 1,094.68 mi (1,761.72 km) |
| Grimbergen to Ovidiu | 1,209.85 mi (1,947.07 km) |
