| Boadilla del Monte to Nasaud | 1,477.63 mi (2,378.01 km) |
| Boadilla del Monte to Navodari | 1,669.25 mi (2,686.40 km) |
| Boadilla del Monte to Negresti-Oas | 1,439.23 mi (2,316.21 km) |
| Boadilla del Monte to Nehoiu | 1,556.01 mi (2,504.16 km) |
| Boadilla del Monte to Ocna Mures | 1,443.98 mi (2,323.87 km) |
| Boadilla del Monte to Odobesti | 1,593.89 mi (2,565.12 km) |
| Boadilla del Monte to Odorheiu Secuiesc | 1,511.85 mi (2,433.08 km) |
| Boadilla del Monte to Oltenita | 1,571.88 mi (2,529.70 km) |
| Boadilla del Monte to Onesti | 1,581.42 mi (2,545.04 km) |
| Boadilla del Monte to Oradea | 1,360.08 mi (2,188.84 km) |
| Boadilla del Monte to Orastie | 1,408.54 mi (2,266.83 km) |
| Boadilla del Monte to Oravita | 1,330.23 mi (2,140.80 km) |
| Boadilla del Monte to Orsova | 1,363.37 mi (2,194.14 km) |
| Boadilla del Monte to Otelu Rosu | 1,365.58 mi (2,197.68 km) |
| Boadilla del Monte to Otopeni | 1,543.53 mi (2,484.07 km) |
