| Santander to Nasaud | 1,386.56 mi (2,231.45 km) |
| Santander to Navodari | 1,604.71 mi (2,582.53 km) |
| Santander to Negresti-Oas | 1,342.02 mi (2,159.77 km) |
| Santander to Nehoiu | 1,483.21 mi (2,386.99 km) |
| Santander to Ocna Mures | 1,361.24 mi (2,190.71 km) |
| Santander to Odobesti | 1,517.18 mi (2,441.66 km) |
| Santander to Odorheiu Secuiesc | 1,430.14 mi (2,301.59 km) |
| Santander to Oltenita | 1,510.66 mi (2,431.17 km) |
| Santander to Onesti | 1,500.32 mi (2,414.52 km) |
| Santander to Oradea | 1,269.55 mi (2,043.14 km) |
| Santander to Orastie | 1,331.01 mi (2,142.05 km) |
| Santander to Oravita | 1,260.98 mi (2,029.35 km) |
| Santander to Orsova | 1,297.47 mi (2,088.07 km) |
| Santander to Otelu Rosu | 1,291.30 mi (2,078.15 km) |
| Santander to Otopeni | 1,478.28 mi (2,379.06 km) |
