| Omaha to Oliveira de Frades | 4,364.41 mi (7,023.84 km) |
| Omaha to Oliveira do Bairro | 4,357.88 mi (7,013.33 km) |
| Omaha to Oliveira do Hospital | 4,391.97 mi (7,068.19 km) |
| Omaha to Ourem | 4,387.34 mi (7,060.74 km) |
| Omaha to Ovar | 4,338.99 mi (6,982.94 km) |
| Omaha to Pacos de Ferreira | 4,334.46 mi (6,975.65 km) |
| Omaha to Palmela | 4,413.25 mi (7,102.44 km) |
| Omaha to Paredes | 4,339.86 mi (6,984.33 km) |
| Omaha to Paredes de Coura | 4,303.61 mi (6,926.00 km) |
| Omaha to Penacova | 4,376.66 mi (7,043.56 km) |
| Omaha to Penafiel | 4,341.80 mi (6,987.45 km) |
| Omaha to Peniche | 4,362.75 mi (7,021.16 km) |
| Omaha to Peso da Regua | 4,365.56 mi (7,025.70 km) |
| Omaha to Pinhal Novo | 4,410.18 mi (7,097.50 km) |
| Omaha to Pinhel | 4,410.98 mi (7,098.79 km) |
