| Ostrava to Oignies | 677.51 mi (1,090.35 km) |
| Ostrava to Oissel | 769.52 mi (1,238.42 km) |
| Ostrava to Olivet | 756.02 mi (1,216.70 km) |
| Ostrava to Ollioules | 749.76 mi (1,206.62 km) |
| Ostrava to Olonne-sur-Mer | 948.87 mi (1,527.06 km) |
| Ostrava to Oloron-Sainte-Marie | 1,005.13 mi (1,617.60 km) |
| Ostrava to Onet Village | 827.24 mi (1,331.32 km) |
| Ostrava to Onnaing | 651.15 mi (1,047.92 km) |
| Ostrava to Orange | 745.87 mi (1,200.36 km) |
| Ostrava to Orchies | 666.49 mi (1,072.60 km) |
| Ostrava to Orleans | 754.89 mi (1,214.89 km) |
| Ostrava to Orly | 719.11 mi (1,157.29 km) |
| Ostrava to Ormesson-sur-Marne | 712.03 mi (1,145.90 km) |
| Ostrava to Orsay | 728.92 mi (1,173.09 km) |
| Ostrava to Orthez | 1,000.92 mi (1,610.82 km) |
