| Aveiro to Orbetello | 1,032.42 mi (1,661.51 km) |
| Aveiro to Oria | 1,374.38 mi (2,211.85 km) |
| Aveiro to Oristano | 908.89 mi (1,462.72 km) |
| Aveiro to Orta Nova | 1,267.42 mi (2,039.71 km) |
| Aveiro to Orte | 1,092.24 mi (1,757.80 km) |
| Aveiro to Ortona | 1,195.13 mi (1,923.38 km) |
| Aveiro to Orvieto | 1,078.24 mi (1,735.26 km) |
| Aveiro to Orzinuovi | 992.14 mi (1,596.70 km) |
| Aveiro to Osimo | 1,148.83 mi (1,848.86 km) |
| Aveiro to Ospitaletto | 1,001.17 mi (1,611.22 km) |
| Aveiro to Ostuni | 1,369.36 mi (2,203.77 km) |
| Aveiro to Ottaviano | 1,207.27 mi (1,942.91 km) |
| Aveiro to Ovada | 919.64 mi (1,480.01 km) |
| Aveiro to Ozieri | 924.42 mi (1,487.71 km) |
| Aveiro to Paceco | 1,145.18 mi (1,842.99 km) |
