| Quarteira to Oswego (Illinois) | 4,136.76 mi (6,657.47 km) |
| Quarteira to Oswego (New York) | 3,531.43 mi (5,683.29 km) |
| Quarteira to Otsego (Minnesota) | 4,272.01 mi (6,875.14 km) |
| Quarteira to Ottawa (Illinois) | 4,169.22 mi (6,709.71 km) |
| Quarteira to Ottawa (Kansas) | 4,559.25 mi (7,337.40 km) |
| Quarteira to Ottumwa (Iowa) | 4,347.32 mi (6,996.34 km) |
| Quarteira to Overland (Missouri) | 4,323.19 mi (6,957.50 km) |
| Quarteira to Overland Park (Kansas) | 4,522.44 mi (7,278.16 km) |
| Quarteira to Overlea (Maryland) | 3,624.93 mi (5,833.76 km) |
| Quarteira to Oviedo (Florida) | 4,178.41 mi (6,724.51 km) |
| Quarteira to Owasso (Oklahoma) | 4,665.68 mi (7,508.69 km) |
| Quarteira to Owatonna (Minnesota) | 4,290.01 mi (6,904.10 km) |
| Quarteira to Owensboro (Kentucky) | 4,194.30 mi (6,750.08 km) |
| Quarteira to Owings Mills (Maryland) | 3,637.45 mi (5,853.91 km) |
| Quarteira to Owosso (Michigan) | 3,905.74 mi (6,285.69 km) |
