| Estoril to Oswego (Illinois) | 4,018.00 mi (6,466.34 km) |
| Estoril to Oswego (New York) | 3,414.78 mi (5,495.56 km) |
| Estoril to Otsego (Minnesota) | 4,147.89 mi (6,675.38 km) |
| Estoril to Ottawa (Illinois) | 4,050.63 mi (6,518.87 km) |
| Estoril to Ottawa (Kansas) | 4,440.84 mi (7,146.84 km) |
| Estoril to Ottumwa (Iowa) | 4,227.66 mi (6,803.76 km) |
| Estoril to Overland (Missouri) | 4,206.93 mi (6,770.41 km) |
| Estoril to Overland Park (Kansas) | 4,404.00 mi (7,087.55 km) |
| Estoril to Overlea (Maryland) | 3,514.27 mi (5,655.66 km) |
| Estoril to Oviedo (Florida) | 4,081.80 mi (6,569.03 km) |
| Estoril to Owasso (Oklahoma) | 4,549.41 mi (7,321.56 km) |
| Estoril to Owatonna (Minnesota) | 4,167.06 mi (6,706.23 km) |
| Estoril to Owensboro (Kentucky) | 4,080.74 mi (6,567.32 km) |
| Estoril to Owings Mills (Maryland) | 3,526.59 mi (5,675.49 km) |
| Estoril to Owosso (Michigan) | 3,787.03 mi (6,094.64 km) |
