| Smolyan to Oignies | 1,202.24 mi (1,934.82 km) |
| Smolyan to Oissel | 1,256.44 mi (2,022.04 km) |
| Smolyan to Olivet | 1,194.94 mi (1,923.06 km) |
| Smolyan to Ollioules | 966.43 mi (1,555.33 km) |
| Smolyan to Olonne-sur-Mer | 1,351.19 mi (2,174.53 km) |
| Smolyan to Oloron-Sainte-Marie | 1,291.28 mi (2,078.11 km) |
| Smolyan to Onet Village | 1,130.36 mi (1,819.14 km) |
| Smolyan to Onnaing | 1,175.52 mi (1,891.82 km) |
| Smolyan to Orange | 1,020.10 mi (1,641.69 km) |
| Smolyan to Orchies | 1,192.21 mi (1,918.67 km) |
| Smolyan to Orleans | 1,195.15 mi (1,923.41 km) |
| Smolyan to Orly | 1,188.29 mi (1,912.36 km) |
| Smolyan to Ormesson-sur-Marne | 1,182.75 mi (1,903.44 km) |
| Smolyan to Orsay | 1,196.41 mi (1,925.43 km) |
| Smolyan to Orthez | 1,298.31 mi (2,089.43 km) |
