| Kalmthout to Oignies | 90.02 mi (144.88 km) |
| Kalmthout to Oissel | 204.97 mi (329.86 km) |
| Kalmthout to Olivet | 268.89 mi (432.73 km) |
| Kalmthout to Ollioules | 573.23 mi (922.53 km) |
| Kalmthout to Olonne-sur-Mer | 438.18 mi (705.19 km) |
| Kalmthout to Oloron-Sainte-Marie | 613.37 mi (987.12 km) |
| Kalmthout to Onet Village | 492.54 mi (792.67 km) |
| Kalmthout to Onnaing | 78.51 mi (126.35 km) |
| Kalmthout to Orange | 500.83 mi (806.01 km) |
| Kalmthout to Orchies | 82.31 mi (132.47 km) |
| Kalmthout to Orleans | 266.30 mi (428.56 km) |
| Kalmthout to Orly | 204.23 mi (328.68 km) |
| Kalmthout to Ormesson-sur-Marne | 198.78 mi (319.90 km) |
| Kalmthout to Orsay | 211.28 mi (340.02 km) |
| Kalmthout to Orthez | 597.53 mi (961.63 km) |
