| Barcelona to Opwijk | 669.06 mi (1,076.74 km) |
| Barcelona to Ostend | 681.02 mi (1,095.99 km) |
| Barcelona to Oud-Heverlee | 663.69 mi (1,068.10 km) |
| Barcelona to Oud-Turnhout | 699.17 mi (1,125.21 km) |
| Barcelona to Oudenaarde | 657.65 mi (1,058.38 km) |
| Barcelona to Oudenburg | 678.30 mi (1,091.61 km) |
| Barcelona to Oupeye | 665.25 mi (1,070.62 km) |
| Barcelona to Overijse | 659.18 mi (1,060.85 km) |
| Barcelona to Overpelt | 696.67 mi (1,121.19 km) |
| Barcelona to Paal | 682.26 mi (1,098.00 km) |
| Barcelona to Peer | 691.44 mi (1,112.77 km) |
| Barcelona to Pepinster | 657.98 mi (1,058.92 km) |
| Barcelona to Peruwelz | 634.69 mi (1,021.43 km) |
| Barcelona to Perwez | 650.85 mi (1,047.44 km) |
| Barcelona to Philippeville | 619.78 mi (997.44 km) |
