| Karlovy Vary to Oignies | 435.53 mi (700.92 km) |
| Karlovy Vary to Oissel | 528.56 mi (850.63 km) |
| Karlovy Vary to Olivet | 522.51 mi (840.90 km) |
| Karlovy Vary to Ollioules | 591.82 mi (952.45 km) |
| Karlovy Vary to Olonne-sur-Mer | 717.41 mi (1,154.55 km) |
| Karlovy Vary to Oloron-Sainte-Marie | 800.56 mi (1,288.37 km) |
| Karlovy Vary to Onet Village | 628.45 mi (1,011.39 km) |
| Karlovy Vary to Onnaing | 409.12 mi (658.42 km) |
| Karlovy Vary to Orange | 565.51 mi (910.10 km) |
| Karlovy Vary to Orchies | 424.51 mi (683.18 km) |
| Karlovy Vary to Orleans | 521.15 mi (838.70 km) |
| Karlovy Vary to Orly | 481.02 mi (774.13 km) |
| Karlovy Vary to Ormesson-sur-Marne | 473.85 mi (762.59 km) |
| Karlovy Vary to Orsay | 490.89 mi (790.02 km) |
| Karlovy Vary to Orthez | 793.32 mi (1,276.72 km) |
