| Idanha-a-Nova to Odessa (Texas) | 5,091.34 mi (8,193.72 km) |
| Idanha-a-Nova to Ogden (Utah) | 5,110.67 mi (8,224.82 km) |
| Idanha-a-Nova to Oildale (California) | 5,662.69 mi (9,113.21 km) |
| Idanha-a-Nova to Ojus (Florida) | 4,221.47 mi (6,793.80 km) |
| Idanha-a-Nova to Okemos (Michigan) | 3,864.12 mi (6,218.70 km) |
| Idanha-a-Nova to Oklahoma City (Oklahoma) | 4,721.10 mi (7,597.88 km) |
| Idanha-a-Nova to Okmulgee (Oklahoma) | 4,645.28 mi (7,475.85 km) |
| Idanha-a-Nova to Olathe (Kansas) | 4,467.78 mi (7,190.20 km) |
| Idanha-a-Nova to Old Jamestown (Missouri) | 4,260.34 mi (6,856.36 km) |
| Idanha-a-Nova to Oldsmar (Florida) | 4,272.66 mi (6,876.18 km) |
| Idanha-a-Nova to Olean (New York) | 3,603.69 mi (5,799.57 km) |
| Idanha-a-Nova to Olive Branch (Mississippi) | 4,377.23 mi (7,044.48 km) |
| Idanha-a-Nova to Olivehurst (California) | 5,585.15 mi (8,988.43 km) |
| Idanha-a-Nova to Olney (Maryland) | 3,620.67 mi (5,826.90 km) |
| Idanha-a-Nova to Olympia (Washington) | 5,245.65 mi (8,442.06 km) |
