| Viljandi to Opwijk | 990.47 mi (1,594.01 km) |
| Viljandi to Ostend | 1,022.27 mi (1,645.19 km) |
| Viljandi to Oud-Heverlee | 980.16 mi (1,577.42 km) |
| Viljandi to Oud-Turnhout | 948.31 mi (1,526.15 km) |
| Viljandi to Oudenaarde | 1,015.25 mi (1,633.88 km) |
| Viljandi to Oudenburg | 1,021.31 mi (1,643.64 km) |
| Viljandi to Oupeye | 953.47 mi (1,534.46 km) |
| Viljandi to Overijse | 986.84 mi (1,588.17 km) |
| Viljandi to Overpelt | 938.16 mi (1,509.83 km) |
| Viljandi to Paal | 954.14 mi (1,535.54 km) |
| Viljandi to Peer | 940.64 mi (1,513.81 km) |
| Viljandi to Pepinster | 954.29 mi (1,535.79 km) |
| Viljandi to Peruwelz | 1,030.52 mi (1,658.47 km) |
| Viljandi to Perwez | 984.62 mi (1,584.59 km) |
| Viljandi to Philippeville | 1,012.74 mi (1,629.85 km) |
