| Sintra to Oerlinghausen | 1,256.33 mi (2,021.86 km) |
| Sintra to Oestrich-Winkel | 1,150.59 mi (1,851.69 km) |
| Sintra to Offenburg | 1,089.56 mi (1,753.47 km) |
| Sintra to Oftersheim | 1,147.77 mi (1,847.17 km) |
| Sintra to Ohrdruf | 1,282.28 mi (2,063.64 km) |
| Sintra to Ohringen | 1,176.72 mi (1,893.75 km) |
| Sintra to Olbernhau | 1,374.94 mi (2,212.75 km) |
| Sintra to Olching | 1,218.28 mi (1,960.63 km) |
| Sintra to Oldenburg | 1,295.43 mi (2,084.79 km) |
| Sintra to Oldenburg in Holstein | 1,430.08 mi (2,301.48 km) |
| Sintra to Olfen | 1,203.37 mi (1,936.63 km) |
| Sintra to Olpe | 1,187.17 mi (1,910.57 km) |
| Sintra to Olsberg | 1,223.54 mi (1,969.09 km) |
| Sintra to Oranienburg | 1,444.28 mi (2,324.34 km) |
| Sintra to Ortenberg | 1,202.93 mi (1,935.93 km) |
