| Seinajoki to Opwijk | 1,070.74 mi (1,723.19 km) |
| Seinajoki to Ostend | 1,086.71 mi (1,748.88 km) |
| Seinajoki to Oud-Heverlee | 1,067.08 mi (1,717.30 km) |
| Seinajoki to Oud-Turnhout | 1,031.55 mi (1,660.12 km) |
| Seinajoki to Oudenaarde | 1,091.46 mi (1,756.54 km) |
| Seinajoki to Oudenburg | 1,087.11 mi (1,749.54 km) |
| Seinajoki to Oupeye | 1,052.02 mi (1,693.06 km) |
| Seinajoki to Overijse | 1,073.12 mi (1,727.02 km) |
| Seinajoki to Overpelt | 1,027.27 mi (1,653.23 km) |
| Seinajoki to Paal | 1,043.28 mi (1,679.00 km) |
| Seinajoki to Peer | 1,031.33 mi (1,659.76 km) |
| Seinajoki to Pepinster | 1,056.54 mi (1,700.34 km) |
| Seinajoki to Peruwelz | 1,111.11 mi (1,788.16 km) |
| Seinajoki to Perwez | 1,075.88 mi (1,731.46 km) |
| Seinajoki to Philippeville | 1,106.96 mi (1,781.47 km) |
