| Portalegre to Opole | 1,454.87 mi (2,341.39 km) |
| Portalegre to Orzesze | 1,475.16 mi (2,374.05 km) |
| Portalegre to Osowa | 1,591.60 mi (2,561.43 km) |
| Portalegre to Ostroda | 1,620.97 mi (2,608.69 km) |
| Portalegre to Ostroleka | 1,662.37 mi (2,675.32 km) |
| Portalegre to Ostrow Mazowiecka | 1,668.08 mi (2,684.52 km) |
| Portalegre to Ostrow Wielkopolski | 1,477.90 mi (2,378.46 km) |
| Portalegre to Ostrowiec Swietokrzyski | 1,602.93 mi (2,579.67 km) |
| Portalegre to Ostrzeszow | 1,475.69 mi (2,374.89 km) |
| Portalegre to Oswiecim | 1,492.16 mi (2,401.40 km) |
| Portalegre to Otwock | 1,625.76 mi (2,616.41 km) |
| Portalegre to Ozarow Mazowiecki | 1,610.00 mi (2,591.05 km) |
| Portalegre to Ozimek | 1,466.36 mi (2,359.87 km) |
| Portalegre to Ozorkow | 1,544.01 mi (2,484.84 km) |
| Portalegre to Pabianice | 1,539.21 mi (2,477.12 km) |
