| Sintra to Opole | 1,558.31 mi (2,507.86 km) |
| Sintra to Orzesze | 1,579.86 mi (2,542.54 km) |
| Sintra to Osowa | 1,687.78 mi (2,716.22 km) |
| Sintra to Ostroda | 1,719.61 mi (2,767.45 km) |
| Sintra to Ostroleka | 1,763.06 mi (2,837.37 km) |
| Sintra to Ostrow Mazowiecka | 1,769.41 mi (2,847.59 km) |
| Sintra to Ostrow Wielkopolski | 1,579.41 mi (2,541.82 km) |
| Sintra to Ostrowiec Swietokrzyski | 1,707.29 mi (2,747.62 km) |
| Sintra to Ostrzeszow | 1,577.71 mi (2,539.08 km) |
| Sintra to Oswiecim | 1,597.22 mi (2,570.48 km) |
| Sintra to Otwock | 1,728.05 mi (2,781.03 km) |
| Sintra to Ozarow Mazowiecki | 1,711.91 mi (2,755.06 km) |
| Sintra to Ozimek | 1,569.91 mi (2,526.53 km) |
| Sintra to Ozorkow | 1,645.68 mi (2,648.46 km) |
| Sintra to Pabianice | 1,641.52 mi (2,641.77 km) |
