| Madrid to Nasaud | 1,469.34 mi (2,364.68 km) |
| Madrid to Navodari | 1,660.53 mi (2,672.37 km) |
| Madrid to Negresti-Oas | 1,431.07 mi (2,303.08 km) |
| Madrid to Nehoiu | 1,547.41 mi (2,490.32 km) |
| Madrid to Ocna Mures | 1,435.55 mi (2,310.30 km) |
| Madrid to Odobesti | 1,585.34 mi (2,551.36 km) |
| Madrid to Odorheiu Secuiesc | 1,503.39 mi (2,419.47 km) |
| Madrid to Oltenita | 1,563.13 mi (2,515.62 km) |
| Madrid to Onesti | 1,572.94 mi (2,531.40 km) |
| Madrid to Oradea | 1,351.81 mi (2,175.52 km) |
| Madrid to Orastie | 1,400.04 mi (2,253.14 km) |
| Madrid to Oravita | 1,321.62 mi (2,126.94 km) |
| Madrid to Orsova | 1,354.71 mi (2,180.19 km) |
| Madrid to Otelu Rosu | 1,357.03 mi (2,183.93 km) |
| Madrid to Otopeni | 1,534.83 mi (2,470.07 km) |
