| Chalkida to Octeville | 1,461.10 mi (2,351.41 km) |
| Chalkida to Oignies | 1,303.82 mi (2,098.30 km) |
| Chalkida to Oissel | 1,340.92 mi (2,158.00 km) |
| Chalkida to Olivet | 1,265.24 mi (2,036.21 km) |
| Chalkida to Ollioules | 980.61 mi (1,578.15 km) |
| Chalkida to Olonne-sur-Mer | 1,399.60 mi (2,252.43 km) |
| Chalkida to Oloron-Sainte-Marie | 1,301.78 mi (2,095.01 km) |
| Chalkida to Onet Village | 1,158.12 mi (1,863.81 km) |
| Chalkida to Onnaing | 1,278.28 mi (2,057.20 km) |
| Chalkida to Orange | 1,047.99 mi (1,686.58 km) |
| Chalkida to Orchies | 1,294.66 mi (2,083.55 km) |
| Chalkida to Orleans | 1,265.93 mi (2,037.31 km) |
| Chalkida to Orly | 1,269.86 mi (2,043.65 km) |
| Chalkida to Ormesson-sur-Marne | 1,265.20 mi (2,036.14 km) |
| Chalkida to Orsay | 1,276.90 mi (2,054.98 km) |
