| Niederkassel to Octeville | 392.02 mi (630.90 km) |
| Niederkassel to Oignies | 178.60 mi (287.43 km) |
| Niederkassel to Oissel | 282.38 mi (454.44 km) |
| Niederkassel to Olivet | 308.12 mi (495.87 km) |
| Niederkassel to Ollioules | 533.37 mi (858.38 km) |
| Niederkassel to Olonne-sur-Mer | 498.34 mi (802.00 km) |
| Niederkassel to Oloron-Sainte-Marie | 637.18 mi (1,025.44 km) |
| Niederkassel to Onet Village | 491.17 mi (790.47 km) |
| Niederkassel to Onnaing | 153.52 mi (247.06 km) |
| Niederkassel to Orange | 472.91 mi (761.08 km) |
| Niederkassel to Orchies | 167.67 mi (269.83 km) |
| Niederkassel to Orleans | 306.01 mi (492.47 km) |
| Niederkassel to Orly | 251.67 mi (405.02 km) |
| Niederkassel to Ormesson-sur-Marne | 244.62 mi (393.68 km) |
| Niederkassel to Orsay | 261.09 mi (420.18 km) |
