| Mealhada to Orbetello | 1,026.38 mi (1,651.80 km) |
| Mealhada to Oria | 1,366.57 mi (2,199.27 km) |
| Mealhada to Oristano | 899.29 mi (1,447.26 km) |
| Mealhada to Orta Nova | 1,260.25 mi (2,028.17 km) |
| Mealhada to Orte | 1,086.23 mi (1,748.11 km) |
| Mealhada to Ortona | 1,189.01 mi (1,913.52 km) |
| Mealhada to Orvieto | 1,072.55 mi (1,726.10 km) |
| Mealhada to Orzinuovi | 990.29 mi (1,593.72 km) |
| Mealhada to Osimo | 1,144.04 mi (1,841.15 km) |
| Mealhada to Ospitaletto | 999.49 mi (1,608.53 km) |
| Mealhada to Ostuni | 1,361.76 mi (2,191.54 km) |
| Mealhada to Ottaviano | 1,199.48 mi (1,930.38 km) |
| Mealhada to Ovada | 916.99 mi (1,475.75 km) |
| Mealhada to Ozieri | 915.80 mi (1,473.83 km) |
| Mealhada to Paceco | 1,134.09 mi (1,825.14 km) |
