| Hoeilaart to Olivenza | 1,006.93 mi (1,620.50 km) |
| Hoeilaart to Olot | 600.49 mi (966.40 km) |
| Hoeilaart to Onate | 624.76 mi (1,005.46 km) |
| Hoeilaart to Onda | 780.60 mi (1,256.26 km) |
| Hoeilaart to Onteniente | 861.44 mi (1,386.35 km) |
| Hoeilaart to Orihuela | 915.36 mi (1,473.13 km) |
| Hoeilaart to Osuna | 1,046.98 mi (1,684.96 km) |
| Hoeilaart to Ourense | 824.09 mi (1,326.25 km) |
| Hoeilaart to Oviedo | 704.01 mi (1,132.99 km) |
| Hoeilaart to Paiporta | 818.40 mi (1,317.09 km) |
| Hoeilaart to Pajara | 1,826.26 mi (2,939.08 km) |
| Hoeilaart to Palafolls | 633.86 mi (1,020.10 km) |
| Hoeilaart to Palafrugell | 614.55 mi (989.03 km) |
| Hoeilaart to Palamos | 619.64 mi (997.22 km) |
| Hoeilaart to Palencia | 740.08 mi (1,191.04 km) |
