| Viljandi to Oignies | 1,052.48 mi (1,693.80 km) |
| Viljandi to Oissel | 1,167.44 mi (1,878.81 km) |
| Viljandi to Olivet | 1,211.04 mi (1,948.99 km) |
| Viljandi to Ollioules | 1,350.51 mi (2,173.44 km) |
| Viljandi to Olonne-sur-Mer | 1,397.19 mi (2,248.56 km) |
| Viljandi to Oloron-Sainte-Marie | 1,534.22 mi (2,469.08 km) |
| Viljandi to Onet Village | 1,372.86 mi (2,209.41 km) |
| Viljandi to Onnaing | 1,035.80 mi (1,666.95 km) |
| Viljandi to Orange | 1,321.31 mi (2,126.43 km) |
| Viljandi to Orchies | 1,043.79 mi (1,679.82 km) |
| Viljandi to Orleans | 1,208.87 mi (1,945.49 km) |
| Viljandi to Orly | 1,152.17 mi (1,854.24 km) |
| Viljandi to Ormesson-sur-Marne | 1,145.39 mi (1,843.33 km) |
| Viljandi to Orsay | 1,161.11 mi (1,868.62 km) |
| Viljandi to Orthez | 1,523.32 mi (2,451.54 km) |
