| Sintra to Oberkirch | 1,097.81 mi (1,766.76 km) |
| Sintra to Obernburg am Main | 1,186.31 mi (1,909.18 km) |
| Sintra to Obernkirchen | 1,284.25 mi (2,066.79 km) |
| Sintra to Oberschleissheim | 1,230.19 mi (1,979.79 km) |
| Sintra to Oberstdorf | 1,151.96 mi (1,853.91 km) |
| Sintra to Obertraubling | 1,275.82 mi (2,053.24 km) |
| Sintra to Obertshausen | 1,183.56 mi (1,904.75 km) |
| Sintra to Oberursel | 1,179.57 mi (1,898.33 km) |
| Sintra to Ochsenfurt | 1,214.48 mi (1,954.51 km) |
| Sintra to Ochsenhausen | 1,157.52 mi (1,862.85 km) |
| Sintra to Ochtrup | 1,219.90 mi (1,963.24 km) |
| Sintra to Odenthal | 1,163.84 mi (1,873.02 km) |
| Sintra to Oelde | 1,233.48 mi (1,985.10 km) |
| Sintra to Oelsnitz | 1,321.67 mi (2,127.03 km) |
| Sintra to Oer-Erkenschwick | 1,195.70 mi (1,924.30 km) |
