| Idanha-a-Nova to Noventa Vicentina | 1,020.97 mi (1,643.09 km) |
| Idanha-a-Nova to Novi di Modena | 984.40 mi (1,584.24 km) |
| Idanha-a-Nova to Novi Ligure | 881.99 mi (1,419.43 km) |
| Idanha-a-Nova to Nuoro | 874.51 mi (1,407.38 km) |
| Idanha-a-Nova to Occhiobello | 1,017.21 mi (1,637.03 km) |
| Idanha-a-Nova to Oderzo | 1,074.68 mi (1,729.54 km) |
| Idanha-a-Nova to Oggiono | 930.30 mi (1,497.17 km) |
| Idanha-a-Nova to Olbia | 881.60 mi (1,418.79 km) |
| Idanha-a-Nova to Oleggio | 893.46 mi (1,437.88 km) |
| Idanha-a-Nova to Olgiate Comasco | 912.97 mi (1,469.28 km) |
| Idanha-a-Nova to Olgiate Olona | 905.59 mi (1,457.41 km) |
| Idanha-a-Nova to Omegna | 890.23 mi (1,432.69 km) |
| Idanha-a-Nova to Opera | 915.10 mi (1,472.71 km) |
| Idanha-a-Nova to Oppeano | 1,004.83 mi (1,617.11 km) |
| Idanha-a-Nova to Orbassano | 829.32 mi (1,334.66 km) |
