| Alella to Oerlinghausen | 783.15 mi (1,260.36 km) |
| Alella to Oestrich-Winkel | 648.32 mi (1,043.38 km) |
| Alella to Offenburg | 554.54 mi (892.45 km) |
| Alella to Oftersheim | 623.22 mi (1,002.98 km) |
| Alella to Ohrdruf | 759.70 mi (1,222.62 km) |
| Alella to Ohringen | 636.35 mi (1,024.10 km) |
| Alella to Olbernhau | 823.65 mi (1,325.53 km) |
| Alella to Olching | 639.37 mi (1,028.96 km) |
| Alella to Oldenburg | 850.51 mi (1,368.76 km) |
| Alella to Oldenburg in Holstein | 968.36 mi (1,558.43 km) |
| Alella to Olfen | 745.91 mi (1,200.43 km) |
| Alella to Olpe | 708.56 mi (1,140.31 km) |
| Alella to Olsberg | 741.28 mi (1,192.97 km) |
| Alella to Oranienburg | 930.31 mi (1,497.19 km) |
| Alella to Ortenberg | 692.37 mi (1,114.27 km) |
