| Senec to Octeville | 867.63 mi (1,396.31 km) |
| Senec to Oignies | 665.71 mi (1,071.36 km) |
| Senec to Oissel | 745.07 mi (1,199.07 km) |
| Senec to Olivet | 715.19 mi (1,150.99 km) |
| Senec to Ollioules | 657.89 mi (1,058.77 km) |
| Senec to Olonne-sur-Mer | 902.14 mi (1,451.85 km) |
| Senec to Oloron-Sainte-Marie | 932.83 mi (1,501.24 km) |
| Senec to Onet Village | 753.85 mi (1,213.21 km) |
| Senec to Onnaing | 638.58 mi (1,027.69 km) |
| Senec to Orange | 663.98 mi (1,068.57 km) |
| Senec to Orchies | 654.85 mi (1,053.89 km) |
| Senec to Orleans | 714.45 mi (1,149.80 km) |
| Senec to Orly | 687.15 mi (1,105.86 km) |
| Senec to Ormesson-sur-Marne | 680.40 mi (1,095.01 km) |
| Senec to Orsay | 696.65 mi (1,121.15 km) |
