| Brussels to Olivenza | 1,008.19 mi (1,622.53 km) |
| Brussels to Olot | 605.13 mi (973.86 km) |
| Brussels to Onate | 626.62 mi (1,008.44 km) |
| Brussels to Onda | 784.26 mi (1,262.14 km) |
| Brussels to Onteniente | 865.11 mi (1,392.27 km) |
| Brussels to Orihuela | 919.00 mi (1,478.99 km) |
| Brussels to Osuna | 1,049.25 mi (1,688.61 km) |
| Brussels to Ourense | 823.89 mi (1,325.92 km) |
| Brussels to Oviedo | 704.13 mi (1,133.18 km) |
| Brussels to Paiporta | 822.07 mi (1,323.00 km) |
| Brussels to Pajara | 1,827.44 mi (2,940.97 km) |
| Brussels to Palafolls | 638.66 mi (1,027.83 km) |
| Brussels to Palafrugell | 619.53 mi (997.04 km) |
| Brussels to Palamos | 624.61 mi (1,005.21 km) |
| Brussels to Palencia | 741.31 mi (1,193.03 km) |
