| Quarteira to Oerlinghausen | 1,313.25 mi (2,113.47 km) |
| Quarteira to Oestrich-Winkel | 1,198.56 mi (1,928.89 km) |
| Quarteira to Offenburg | 1,127.82 mi (1,815.05 km) |
| Quarteira to Oftersheim | 1,190.02 mi (1,915.16 km) |
| Quarteira to Ohrdruf | 1,327.34 mi (2,136.15 km) |
| Quarteira to Ohringen | 1,215.18 mi (1,955.65 km) |
| Quarteira to Olbernhau | 1,412.87 mi (2,273.79 km) |
| Quarteira to Olching | 1,245.28 mi (2,004.08 km) |
| Quarteira to Oldenburg | 1,359.33 mi (2,187.64 km) |
| Quarteira to Oldenburg in Holstein | 1,492.30 mi (2,401.63 km) |
| Quarteira to Olfen | 1,262.82 mi (2,032.31 km) |
| Quarteira to Olpe | 1,241.52 mi (1,998.04 km) |
| Quarteira to Olsberg | 1,277.75 mi (2,056.34 km) |
| Quarteira to Oranienburg | 1,493.77 mi (2,403.99 km) |
| Quarteira to Ortenberg | 1,249.84 mi (2,011.43 km) |
