| Boadilla del Monte to Orbetello | 793.07 mi (1,276.33 km) |
| Boadilla del Monte to Oria | 1,128.01 mi (1,815.36 km) |
| Boadilla del Monte to Oristano | 658.69 mi (1,060.06 km) |
| Boadilla del Monte to Orta Nova | 1,023.18 mi (1,646.65 km) |
| Boadilla del Monte to Orte | 852.83 mi (1,372.50 km) |
| Boadilla del Monte to Ortona | 955.03 mi (1,536.98 km) |
| Boadilla del Monte to Orvieto | 840.35 mi (1,352.41 km) |
| Boadilla del Monte to Orzinuovi | 777.95 mi (1,251.99 km) |
| Boadilla del Monte to Osimo | 915.18 mi (1,472.84 km) |
| Boadilla del Monte to Ospitaletto | 788.21 mi (1,268.51 km) |
| Boadilla del Monte to Ostuni | 1,123.63 mi (1,808.32 km) |
| Boadilla del Monte to Ottaviano | 961.10 mi (1,546.74 km) |
| Boadilla del Monte to Ovada | 700.48 mi (1,127.32 km) |
| Boadilla del Monte to Ozieri | 676.16 mi (1,088.18 km) |
| Boadilla del Monte to Paceco | 893.93 mi (1,438.64 km) |
