| Estoril to Odessa (Texas) | 5,028.02 mi (8,091.81 km) |
| Estoril to Ogden (Utah) | 5,076.87 mi (8,170.44 km) |
| Estoril to Oildale (California) | 5,626.98 mi (9,055.75 km) |
| Estoril to Ojus (Florida) | 4,123.28 mi (6,635.77 km) |
| Estoril to Okemos (Michigan) | 3,805.93 mi (6,125.06 km) |
| Estoril to Oklahoma City (Oklahoma) | 4,659.32 mi (7,498.45 km) |
| Estoril to Okmulgee (Oklahoma) | 4,582.17 mi (7,374.28 km) |
| Estoril to Olathe (Kansas) | 4,410.33 mi (7,097.74 km) |
| Estoril to Old Jamestown (Missouri) | 4,198.29 mi (6,756.50 km) |
| Estoril to Oldsmar (Florida) | 4,180.77 mi (6,728.30 km) |
| Estoril to Olean (New York) | 3,539.04 mi (5,695.53 km) |
| Estoril to Olive Branch (Mississippi) | 4,306.35 mi (6,930.39 km) |
| Estoril to Olivehurst (California) | 5,559.38 mi (8,946.95 km) |
| Estoril to Olney (Maryland) | 3,547.39 mi (5,708.98 km) |
| Estoril to Olympia (Washington) | 5,236.12 mi (8,426.72 km) |
