| Arrecife to Orbetello | 1,662.66 mi (2,675.79 km) |
| Arrecife to Oria | 1,928.57 mi (3,103.73 km) |
| Arrecife to Oristano | 1,464.84 mi (2,357.43 km) |
| Arrecife to Orta Nova | 1,848.47 mi (2,974.82 km) |
| Arrecife to Orte | 1,717.41 mi (2,763.90 km) |
| Arrecife to Ortona | 1,808.97 mi (2,911.26 km) |
| Arrecife to Orvieto | 1,712.18 mi (2,755.48 km) |
| Arrecife to Orzinuovi | 1,709.10 mi (2,750.53 km) |
| Arrecife to Osimo | 1,797.33 mi (2,892.53 km) |
| Arrecife to Ospitaletto | 1,720.69 mi (2,769.18 km) |
| Arrecife to Ostuni | 1,930.16 mi (3,106.29 km) |
| Arrecife to Ottaviano | 1,777.01 mi (2,859.82 km) |
| Arrecife to Ovada | 1,627.62 mi (2,619.40 km) |
| Arrecife to Ozieri | 1,504.19 mi (2,420.75 km) |
| Arrecife to Paceco | 1,621.25 mi (2,609.14 km) |
