| Santander to Oberkirch | 668.46 mi (1,075.78 km) |
| Santander to Obernburg am Main | 754.07 mi (1,213.56 km) |
| Santander to Obernkirchen | 851.28 mi (1,370.01 km) |
| Santander to Oberschleissheim | 808.41 mi (1,301.01 km) |
| Santander to Oberstdorf | 733.96 mi (1,181.19 km) |
| Santander to Obertraubling | 850.76 mi (1,369.17 km) |
| Santander to Obertshausen | 750.65 mi (1,208.05 km) |
| Santander to Oberursel | 746.32 mi (1,201.08 km) |
| Santander to Ochsenfurt | 783.68 mi (1,261.22 km) |
| Santander to Ochsenhausen | 733.99 mi (1,181.25 km) |
| Santander to Ochtrup | 788.78 mi (1,269.42 km) |
| Santander to Odenthal | 730.65 mi (1,175.87 km) |
| Santander to Oelde | 800.62 mi (1,288.47 km) |
| Santander to Oelsnitz | 890.78 mi (1,433.57 km) |
| Santander to Oer-Erkenschwick | 763.32 mi (1,228.45 km) |
