| Oliveira de Frades to Oerlinghausen | 1,113.02 mi (1,791.22 km) |
| Oliveira de Frades to Oestrich-Winkel | 1,010.51 mi (1,626.26 km) |
| Oliveira de Frades to Offenburg | 953.81 mi (1,535.01 km) |
| Oliveira de Frades to Oftersheim | 1,010.00 mi (1,625.44 km) |
| Oliveira de Frades to Ohrdruf | 1,142.92 mi (1,839.35 km) |
| Oliveira de Frades to Ohringen | 1,040.49 mi (1,674.50 km) |
| Oliveira de Frades to Olbernhau | 1,238.24 mi (1,992.76 km) |
| Oliveira de Frades to Olching | 1,087.48 mi (1,750.14 km) |
| Oliveira de Frades to Oldenburg | 1,150.31 mi (1,851.24 km) |
| Oliveira de Frades to Oldenburg in Holstein | 1,285.18 mi (2,068.29 km) |
| Oliveira de Frades to Olfen | 1,059.45 mi (1,705.02 km) |
| Oliveira de Frades to Olpe | 1,044.78 mi (1,681.41 km) |
| Oliveira de Frades to Olsberg | 1,081.11 mi (1,739.87 km) |
| Oliveira de Frades to Oranienburg | 1,302.94 mi (2,096.87 km) |
| Oliveira de Frades to Ortenberg | 1,063.09 mi (1,710.88 km) |
