| Cascais to Opole | 1,563.95 mi (2,516.93 km) |
| Cascais to Orzesze | 1,585.37 mi (2,551.40 km) |
| Cascais to Osowa | 1,693.96 mi (2,726.16 km) |
| Cascais to Ostroda | 1,725.63 mi (2,777.14 km) |
| Cascais to Ostroleka | 1,768.94 mi (2,846.83 km) |
| Cascais to Ostrow Mazowiecka | 1,775.24 mi (2,856.97 km) |
| Cascais to Ostrow Wielkopolski | 1,585.22 mi (2,551.16 km) |
| Cascais to Ostrowiec Swietokrzyski | 1,712.83 mi (2,756.54 km) |
| Cascais to Ostrzeszow | 1,583.48 mi (2,548.36 km) |
| Cascais to Oswiecim | 1,602.69 mi (2,579.27 km) |
| Cascais to Otwock | 1,733.80 mi (2,790.28 km) |
| Cascais to Ozarow Mazowiecki | 1,717.69 mi (2,764.35 km) |
| Cascais to Ozimek | 1,575.53 mi (2,535.58 km) |
| Cascais to Ozorkow | 1,651.47 mi (2,657.78 km) |
| Cascais to Pabianice | 1,647.26 mi (2,651.01 km) |
