| Madrid to Octeville | 644.19 mi (1,036.72 km) |
| Madrid to Oignies | 765.91 mi (1,232.62 km) |
| Madrid to Oissel | 659.48 mi (1,061.33 km) |
| Madrid to Olivet | 584.39 mi (940.48 km) |
| Madrid to Ollioules | 526.42 mi (847.19 km) |
| Madrid to Olonne-sur-Mer | 433.70 mi (697.96 km) |
| Madrid to Oloron-Sainte-Marie | 249.48 mi (401.49 km) |
| Madrid to Onet Village | 421.30 mi (678.02 km) |
| Madrid to Onnaing | 773.75 mi (1,245.24 km) |
| Madrid to Orange | 505.10 mi (812.87 km) |
| Madrid to Orchies | 771.41 mi (1,241.47 km) |
| Madrid to Orleans | 586.89 mi (944.50 km) |
| Madrid to Orly | 648.35 mi (1,043.42 km) |
| Madrid to Ormesson-sur-Marne | 654.17 mi (1,052.78 km) |
| Madrid to Orsay | 641.00 mi (1,031.59 km) |
