| Haaltert to Oignies | 53.17 mi (85.57 km) |
| Haaltert to Oissel | 167.88 mi (270.18 km) |
| Haaltert to Olivet | 230.03 mi (370.19 km) |
| Haaltert to Ollioules | 543.17 mi (874.15 km) |
| Haaltert to Olonne-sur-Mer | 399.96 mi (643.67 km) |
| Haaltert to Oloron-Sainte-Marie | 574.61 mi (924.75 km) |
| Haaltert to Onet Village | 456.18 mi (734.16 km) |
| Haaltert to Onnaing | 39.53 mi (63.61 km) |
| Haaltert to Orange | 468.71 mi (754.31 km) |
| Haaltert to Orchies | 44.25 mi (71.21 km) |
| Haaltert to Orleans | 227.42 mi (366.00 km) |
| Haaltert to Orly | 165.29 mi (266.02 km) |
| Haaltert to Ormesson-sur-Marne | 159.93 mi (257.38 km) |
| Haaltert to Orsay | 172.26 mi (277.23 km) |
| Haaltert to Orthez | 558.66 mi (899.08 km) |
