| Kardzhali to Oignies | 1,226.66 mi (1,974.12 km) |
| Kardzhali to Oissel | 1,282.81 mi (2,064.48 km) |
| Kardzhali to Olivet | 1,222.91 mi (1,968.08 km) |
| Kardzhali to Ollioules | 999.04 mi (1,607.80 km) |
| Kardzhali to Olonne-sur-Mer | 1,380.94 mi (2,222.40 km) |
| Kardzhali to Oloron-Sainte-Marie | 1,323.71 mi (2,130.30 km) |
| Kardzhali to Onet Village | 1,161.93 mi (1,869.94 km) |
| Kardzhali to Onnaing | 1,199.84 mi (1,930.96 km) |
| Kardzhali to Orange | 1,051.82 mi (1,692.74 km) |
| Kardzhali to Orchies | 1,216.53 mi (1,957.82 km) |
| Kardzhali to Orleans | 1,223.08 mi (1,968.35 km) |
| Kardzhali to Orly | 1,215.10 mi (1,955.51 km) |
| Kardzhali to Ormesson-sur-Marne | 1,209.47 mi (1,946.46 km) |
| Kardzhali to Orsay | 1,223.32 mi (1,968.75 km) |
| Kardzhali to Orthez | 1,330.54 mi (2,141.30 km) |
