| Idanha-a-Nova to Oerlinghausen | 1,125.07 mi (1,810.63 km) |
| Idanha-a-Nova to Oestrich-Winkel | 1,016.23 mi (1,635.46 km) |
| Idanha-a-Nova to Offenburg | 952.84 mi (1,533.45 km) |
| Idanha-a-Nova to Oftersheim | 1,011.95 mi (1,628.57 km) |
| Idanha-a-Nova to Ohrdruf | 1,147.28 mi (1,846.38 km) |
| Idanha-a-Nova to Ohringen | 1,040.13 mi (1,673.93 km) |
| Idanha-a-Nova to Olbernhau | 1,238.42 mi (1,993.04 km) |
| Idanha-a-Nova to Olching | 1,080.12 mi (1,738.29 km) |
| Idanha-a-Nova to Oldenburg | 1,167.15 mi (1,878.35 km) |
| Idanha-a-Nova to Oldenburg in Holstein | 1,301.18 mi (2,094.05 km) |
| Idanha-a-Nova to Olfen | 1,073.04 mi (1,726.90 km) |
| Idanha-a-Nova to Olpe | 1,054.89 mi (1,697.68 km) |
| Idanha-a-Nova to Olsberg | 1,091.25 mi (1,756.20 km) |
| Idanha-a-Nova to Oranienburg | 1,310.67 mi (2,109.33 km) |
| Idanha-a-Nova to Ortenberg | 1,068.34 mi (1,719.33 km) |
