| Portalegre to Oerlinghausen | 1,164.19 mi (1,873.59 km) |
| Portalegre to Oestrich-Winkel | 1,053.89 mi (1,696.07 km) |
| Portalegre to Offenburg | 988.67 mi (1,591.11 km) |
| Portalegre to Oftersheim | 1,048.58 mi (1,687.52 km) |
| Portalegre to Ohrdruf | 1,184.47 mi (1,906.22 km) |
| Portalegre to Ohringen | 1,076.05 mi (1,731.74 km) |
| Portalegre to Olbernhau | 1,274.33 mi (2,050.83 km) |
| Portalegre to Olching | 1,113.72 mi (1,792.36 km) |
| Portalegre to Oldenburg | 1,207.25 mi (1,942.88 km) |
| Portalegre to Oldenburg in Holstein | 1,341.05 mi (2,158.21 km) |
| Portalegre to Olfen | 1,112.53 mi (1,790.45 km) |
| Portalegre to Olpe | 1,093.61 mi (1,760.00 km) |
| Portalegre to Olsberg | 1,129.95 mi (1,818.49 km) |
| Portalegre to Oranienburg | 1,348.65 mi (2,170.44 km) |
| Portalegre to Ortenberg | 1,105.83 mi (1,779.66 km) |
