| Opatija to Oestrich-Winkel | 435.47 mi (700.82 km) |
| Opatija to Offenburg | 370.22 mi (595.81 km) |
| Opatija to Oftersheim | 386.29 mi (621.68 km) |
| Opatija to Ohrdruf | 413.70 mi (665.79 km) |
| Opatija to Ohringen | 349.17 mi (561.94 km) |
| Opatija to Olbernhau | 371.19 mi (597.38 km) |
| Opatija to Olching | 243.20 mi (391.39 km) |
| Opatija to Oldenburg | 604.97 mi (973.60 km) |
| Opatija to Oldenburg in Holstein | 637.79 mi (1,026.43 km) |
| Opatija to Olfen | 542.34 mi (872.81 km) |
| Opatija to Olpe | 492.53 mi (792.64 km) |
| Opatija to Olsberg | 493.79 mi (794.68 km) |
| Opatija to Oranienburg | 514.99 mi (828.79 km) |
| Opatija to Ortenberg | 423.52 mi (681.60 km) |
| Opatija to Oschatz | 415.89 mi (669.31 km) |
