| Barcelona to Oerlinghausen | 792.60 mi (1,275.57 km) |
| Barcelona to Oestrich-Winkel | 657.91 mi (1,058.80 km) |
| Barcelona to Offenburg | 564.31 mi (908.17 km) |
| Barcelona to Oftersheim | 632.97 mi (1,018.66 km) |
| Barcelona to Ohrdruf | 769.50 mi (1,238.40 km) |
| Barcelona to Ohringen | 646.19 mi (1,039.95 km) |
| Barcelona to Olbernhau | 833.57 mi (1,341.50 km) |
| Barcelona to Olching | 649.29 mi (1,044.94 km) |
| Barcelona to Oldenburg | 859.76 mi (1,383.65 km) |
| Barcelona to Oldenburg in Holstein | 977.85 mi (1,573.70 km) |
| Barcelona to Olfen | 755.18 mi (1,215.34 km) |
| Barcelona to Olpe | 717.99 mi (1,155.49 km) |
| Barcelona to Olsberg | 750.78 mi (1,208.26 km) |
| Barcelona to Oranienburg | 940.13 mi (1,512.99 km) |
| Barcelona to Ortenberg | 702.06 mi (1,129.86 km) |
