| Grimbergen to Olivenza | 1,013.74 mi (1,631.45 km) |
| Grimbergen to Olot | 611.25 mi (983.71 km) |
| Grimbergen to Onate | 632.37 mi (1,017.69 km) |
| Grimbergen to Onda | 790.36 mi (1,271.96 km) |
| Grimbergen to Onteniente | 871.22 mi (1,402.09 km) |
| Grimbergen to Orihuela | 925.10 mi (1,488.81 km) |
| Grimbergen to Osuna | 1,055.11 mi (1,698.04 km) |
| Grimbergen to Ourense | 828.82 mi (1,333.86 km) |
| Grimbergen to Oviedo | 709.22 mi (1,141.37 km) |
| Grimbergen to Paiporta | 828.18 mi (1,332.82 km) |
| Grimbergen to Pajara | 1,832.95 mi (2,949.84 km) |
| Grimbergen to Palafolls | 644.77 mi (1,037.66 km) |
| Grimbergen to Palafrugell | 625.62 mi (1,006.84 km) |
| Grimbergen to Palamos | 630.70 mi (1,015.01 km) |
| Grimbergen to Palencia | 746.86 mi (1,201.95 km) |
