| Estoril to Opole | 1,563.01 mi (2,515.41 km) |
| Estoril to Orzesze | 1,584.42 mi (2,549.87 km) |
| Estoril to Osowa | 1,693.09 mi (2,724.76 km) |
| Estoril to Ostroda | 1,724.74 mi (2,775.70 km) |
| Estoril to Ostroleka | 1,768.02 mi (2,845.36 km) |
| Estoril to Ostrow Mazowiecka | 1,774.32 mi (2,855.49 km) |
| Estoril to Ostrow Wielkopolski | 1,584.30 mi (2,549.68 km) |
| Estoril to Ostrowiec Swietokrzyski | 1,711.89 mi (2,755.01 km) |
| Estoril to Ostrzeszow | 1,582.55 mi (2,546.87 km) |
| Estoril to Oswiecim | 1,601.73 mi (2,577.73 km) |
| Estoril to Otwock | 1,732.87 mi (2,788.78 km) |
| Estoril to Ozarow Mazowiecki | 1,716.76 mi (2,762.87 km) |
| Estoril to Ozimek | 1,574.59 mi (2,534.06 km) |
| Estoril to Ozorkow | 1,650.55 mi (2,656.30 km) |
| Estoril to Pabianice | 1,646.33 mi (2,649.51 km) |
