| Idanha-a-Nova to Opwijk | 940.64 mi (1,513.82 km) |
| Idanha-a-Nova to Ostend | 920.94 mi (1,482.12 km) |
| Idanha-a-Nova to Oud-Heverlee | 947.51 mi (1,524.87 km) |
| Idanha-a-Nova to Oud-Turnhout | 981.60 mi (1,579.74 km) |
| Idanha-a-Nova to Oudenaarde | 918.26 mi (1,477.79 km) |
| Idanha-a-Nova to Oudenburg | 920.62 mi (1,481.60 km) |
| Idanha-a-Nova to Oupeye | 970.49 mi (1,561.86 km) |
| Idanha-a-Nova to Overijse | 941.05 mi (1,514.48 km) |
| Idanha-a-Nova to Overpelt | 989.04 mi (1,591.70 km) |
| Idanha-a-Nova to Paal | 972.85 mi (1,565.66 km) |
| Idanha-a-Nova to Peer | 985.89 mi (1,586.63 km) |
| Idanha-a-Nova to Pepinster | 968.99 mi (1,559.44 km) |
| Idanha-a-Nova to Peruwelz | 899.96 mi (1,448.35 km) |
| Idanha-a-Nova to Perwez | 941.19 mi (1,514.70 km) |
| Idanha-a-Nova to Philippeville | 911.82 mi (1,467.43 km) |
