| Estremoz to Orbetello | 1,013.78 mi (1,631.52 km) |
| Estremoz to Oria | 1,341.26 mi (2,158.55 km) |
| Estremoz to Oristano | 865.75 mi (1,393.28 km) |
| Estremoz to Orta Nova | 1,239.38 mi (1,994.59 km) |
| Estremoz to Orte | 1,073.31 mi (1,727.32 km) |
| Estremoz to Ortona | 1,174.82 mi (1,890.69 km) |
| Estremoz to Orvieto | 1,061.67 mi (1,708.59 km) |
| Estremoz to Orzinuovi | 1,002.35 mi (1,613.13 km) |
| Estremoz to Osimo | 1,138.02 mi (1,831.46 km) |
| Estremoz to Ospitaletto | 1,012.51 mi (1,629.47 km) |
| Estremoz to Ostuni | 1,337.80 mi (2,152.98 km) |
| Estremoz to Ottaviano | 1,175.18 mi (1,891.28 km) |
| Estremoz to Ovada | 925.16 mi (1,488.90 km) |
| Estremoz to Ozieri | 888.29 mi (1,429.56 km) |
| Estremoz to Paceco | 1,089.36 mi (1,753.16 km) |
