| Santander to Opwijk | 639.01 mi (1,028.39 km) |
| Santander to Ostend | 621.33 mi (999.94 km) |
| Santander to Oud-Heverlee | 645.51 mi (1,038.84 km) |
| Santander to Oud-Turnhout | 679.77 mi (1,093.98 km) |
| Santander to Oudenaarde | 617.02 mi (993.00 km) |
| Santander to Oudenburg | 620.78 mi (999.05 km) |
| Santander to Oupeye | 668.41 mi (1,075.70 km) |
| Santander to Overijse | 639.08 mi (1,028.49 km) |
| Santander to Overpelt | 686.98 mi (1,105.58 km) |
| Santander to Paal | 670.79 mi (1,079.53 km) |
| Santander to Peer | 683.79 mi (1,100.45 km) |
| Santander to Pepinster | 667.03 mi (1,073.49 km) |
| Santander to Peruwelz | 598.35 mi (962.95 km) |
| Santander to Perwez | 639.08 mi (1,028.50 km) |
| Santander to Philippeville | 609.69 mi (981.20 km) |
