| Quarteira to Orbetello | 1,088.08 mi (1,751.09 km) |
| Quarteira to Oria | 1,401.09 mi (2,254.84 km) |
| Quarteira to Oristano | 922.44 mi (1,484.52 km) |
| Quarteira to Orta Nova | 1,304.20 mi (2,098.90 km) |
| Quarteira to Orte | 1,146.75 mi (1,845.51 km) |
| Quarteira to Ortona | 1,246.25 mi (2,005.64 km) |
| Quarteira to Orvieto | 1,136.98 mi (1,829.79 km) |
| Quarteira to Orzinuovi | 1,096.04 mi (1,763.91 km) |
| Quarteira to Osimo | 1,216.76 mi (1,958.19 km) |
| Quarteira to Ospitaletto | 1,106.78 mi (1,781.19 km) |
| Quarteira to Ostuni | 1,398.96 mi (2,251.40 km) |
| Quarteira to Ottaviano | 1,237.28 mi (1,991.20 km) |
| Quarteira to Ovada | 1,016.77 mi (1,636.34 km) |
| Quarteira to Ozieri | 950.56 mi (1,529.78 km) |
| Quarteira to Paceco | 1,131.15 mi (1,820.41 km) |
