| Alcacer do Sal to Oerlinghausen | 1,251.66 mi (2,014.35 km) |
| Alcacer do Sal to Oestrich-Winkel | 1,141.82 mi (1,837.57 km) |
| Alcacer do Sal to Offenburg | 1,076.56 mi (1,732.55 km) |
| Alcacer do Sal to Oftersheim | 1,136.55 mi (1,829.09 km) |
| Alcacer do Sal to Ohrdruf | 1,272.44 mi (2,047.80 km) |
| Alcacer do Sal to Ohringen | 1,163.95 mi (1,873.19 km) |
| Alcacer do Sal to Olbernhau | 1,362.21 mi (2,192.26 km) |
| Alcacer do Sal to Olching | 1,200.91 mi (1,932.68 km) |
| Alcacer do Sal to Oldenburg | 1,294.00 mi (2,082.48 km) |
| Alcacer do Sal to Oldenburg in Holstein | 1,428.00 mi (2,298.15 km) |
| Alcacer do Sal to Olfen | 1,199.77 mi (1,930.85 km) |
| Alcacer do Sal to Olpe | 1,181.26 mi (1,901.05 km) |
| Alcacer do Sal to Olsberg | 1,217.61 mi (1,959.56 km) |
| Alcacer do Sal to Oranienburg | 1,436.53 mi (2,311.87 km) |
| Alcacer do Sal to Ortenberg | 1,193.78 mi (1,921.20 km) |
