| Kalkar to Octeville | 376.56 mi (606.01 km) |
| Kalkar to Oignies | 167.84 mi (270.12 km) |
| Kalkar to Oissel | 282.00 mi (453.84 km) |
| Kalkar to Olivet | 331.60 mi (533.65 km) |
| Kalkar to Ollioules | 594.53 mi (956.80 km) |
| Kalkar to Olonne-sur-Mer | 511.43 mi (823.07 km) |
| Kalkar to Oloron-Sainte-Marie | 671.90 mi (1,081.32 km) |
| Kalkar to Onet Village | 537.14 mi (864.45 km) |
| Kalkar to Onnaing | 149.66 mi (240.85 km) |
| Kalkar to Orange | 529.59 mi (852.29 km) |
| Kalkar to Orchies | 158.46 mi (255.02 km) |
| Kalkar to Orleans | 329.18 mi (529.77 km) |
| Kalkar to Orly | 269.21 mi (433.25 km) |
| Kalkar to Ormesson-sur-Marne | 262.85 mi (423.02 km) |
| Kalkar to Orsay | 277.54 mi (446.66 km) |
