| Quarteira to Odessa (Texas) | 5,143.35 mi (8,277.42 km) |
| Quarteira to Ogden (Utah) | 5,203.96 mi (8,374.97 km) |
| Quarteira to Oildale (California) | 5,753.37 mi (9,259.15 km) |
| Quarteira to Ojus (Florida) | 4,214.57 mi (6,782.69 km) |
| Quarteira to Okemos (Michigan) | 3,924.39 mi (6,315.70 km) |
| Quarteira to Oklahoma City (Oklahoma) | 4,775.60 mi (7,685.59 km) |
| Quarteira to Okmulgee (Oklahoma) | 4,697.81 mi (7,560.40 km) |
| Quarteira to Olathe (Kansas) | 4,528.83 mi (7,288.44 km) |
| Quarteira to Old Jamestown (Missouri) | 4,314.67 mi (6,943.79 km) |
| Quarteira to Oldsmar (Florida) | 4,277.60 mi (6,884.14 km) |
| Quarteira to Olean (New York) | 3,654.48 mi (5,881.31 km) |
| Quarteira to Olive Branch (Mississippi) | 4,417.86 mi (7,109.86 km) |
| Quarteira to Olivehurst (California) | 5,688.46 mi (9,154.69 km) |
| Quarteira to Olney (Maryland) | 3,657.98 mi (5,886.95 km) |
| Quarteira to Olympia (Washington) | 5,368.16 mi (8,639.22 km) |
