| Caldas da Rainha to Oerlinghausen | 1,214.93 mi (1,955.24 km) |
| Caldas da Rainha to Oestrich-Winkel | 1,110.51 mi (1,787.19 km) |
| Caldas da Rainha to Offenburg | 1,051.09 mi (1,691.57 km) |
| Caldas da Rainha to Oftersheim | 1,108.58 mi (1,784.08 km) |
| Caldas da Rainha to Ohrdruf | 1,242.51 mi (1,999.63 km) |
| Caldas da Rainha to Ohringen | 1,138.10 mi (1,831.60 km) |
| Caldas da Rainha to Olbernhau | 1,336.20 mi (2,150.41 km) |
| Caldas da Rainha to Olching | 1,181.63 mi (1,901.65 km) |
| Caldas da Rainha to Oldenburg | 1,253.19 mi (2,016.81 km) |
| Caldas da Rainha to Oldenburg in Holstein | 1,387.95 mi (2,233.69 km) |
| Caldas da Rainha to Olfen | 1,161.69 mi (1,869.56 km) |
| Caldas da Rainha to Olpe | 1,146.16 mi (1,844.57 km) |
| Caldas da Rainha to Olsberg | 1,182.52 mi (1,903.07 km) |
| Caldas da Rainha to Oranienburg | 1,403.73 mi (2,259.09 km) |
| Caldas da Rainha to Ortenberg | 1,162.95 mi (1,871.59 km) |
