| Karditsa to Octeville | 1,351.78 mi (2,175.47 km) |
| Karditsa to Oignies | 1,196.26 mi (1,925.19 km) |
| Karditsa to Oissel | 1,231.86 mi (1,982.49 km) |
| Karditsa to Olivet | 1,155.63 mi (1,859.81 km) |
| Karditsa to Ollioules | 872.88 mi (1,404.76 km) |
| Karditsa to Olonne-sur-Mer | 1,290.09 mi (2,076.19 km) |
| Karditsa to Oloron-Sainte-Marie | 1,195.08 mi (1,923.30 km) |
| Karditsa to Onet Village | 1,049.53 mi (1,689.05 km) |
| Karditsa to Onnaing | 1,170.89 mi (1,884.36 km) |
| Karditsa to Orange | 939.23 mi (1,511.54 km) |
| Karditsa to Orchies | 1,187.20 mi (1,910.62 km) |
| Karditsa to Orleans | 1,156.33 mi (1,860.93 km) |
| Karditsa to Orly | 1,160.70 mi (1,867.97 km) |
| Karditsa to Ormesson-sur-Marne | 1,156.09 mi (1,860.55 km) |
| Karditsa to Orsay | 1,167.68 mi (1,879.19 km) |
