| Friendswood to Orbetello | 5,618.50 mi (9,042.09 km) |
| Friendswood to Oria | 5,968.28 mi (9,605.02 km) |
| Friendswood to Oristano | 5,594.74 mi (9,003.87 km) |
| Friendswood to Orta Nova | 5,853.34 mi (9,420.04 km) |
| Friendswood to Orte | 5,668.04 mi (9,121.83 km) |
| Friendswood to Ortona | 5,757.71 mi (9,266.15 km) |
| Friendswood to Orvieto | 5,646.56 mi (9,087.27 km) |
| Friendswood to Orzinuovi | 5,456.67 mi (8,781.66 km) |
| Friendswood to Osimo | 5,675.46 mi (9,133.77 km) |
| Friendswood to Ospitaletto | 5,456.92 mi (8,782.06 km) |
| Friendswood to Ostuni | 5,956.59 mi (9,586.20 km) |
| Friendswood to Ottaviano | 5,819.66 mi (9,365.84 km) |
| Friendswood to Ovada | 5,429.59 mi (8,738.09 km) |
| Friendswood to Ozieri | 5,588.98 mi (8,994.60 km) |
| Friendswood to Paceco | 5,845.48 mi (9,407.39 km) |
