| Portimao to Oerlinghausen | 1,322.55 mi (2,128.43 km) |
| Portimao to Oestrich-Winkel | 1,209.28 mi (1,946.15 km) |
| Portimao to Offenburg | 1,140.04 mi (1,834.72 km) |
| Portimao to Oftersheim | 1,201.67 mi (1,933.90 km) |
| Portimao to Ohrdruf | 1,338.65 mi (2,154.34 km) |
| Portimao to Ohringen | 1,227.45 mi (1,975.39 km) |
| Portimao to Olbernhau | 1,425.36 mi (2,293.89 km) |
| Portimao to Olching | 1,259.30 mi (2,026.64 km) |
| Portimao to Oldenburg | 1,367.41 mi (2,200.64 km) |
| Portimao to Oldenburg in Holstein | 1,500.77 mi (2,415.25 km) |
| Portimao to Olfen | 1,271.63 mi (2,046.49 km) |
| Portimao to Olpe | 1,251.21 mi (2,013.63 km) |
| Portimao to Olsberg | 1,287.49 mi (2,072.01 km) |
| Portimao to Oranienburg | 1,504.45 mi (2,421.18 km) |
| Portimao to Ortenberg | 1,260.79 mi (2,029.04 km) |
