| Sintra to Indianola (Iowa) | 4,266.09 mi (6,865.60 km) |
| Sintra to Indio (California) | 5,581.67 mi (8,982.83 km) |
| Sintra to Inglewood (California) | 5,662.34 mi (9,112.65 km) |
| Sintra to Inkster (Michigan) | 3,762.85 mi (6,055.73 km) |
| Sintra to Inver Grove Heights (Minnesota) | 4,133.51 mi (6,652.24 km) |
| Sintra to Inwood (New York) | 3,344.25 mi (5,382.06 km) |
| Sintra to Iona (Florida) | 4,197.47 mi (6,755.18 km) |
| Sintra to Ionia (Michigan) | 3,826.34 mi (6,157.90 km) |
| Sintra to Iowa City (Iowa) | 4,163.50 mi (6,700.51 km) |
| Sintra to Irmo (South Carolina) | 3,899.72 mi (6,275.99 km) |
| Sintra to Irondale (Alabama) | 4,194.12 mi (6,749.78 km) |
| Sintra to Ironton (Ohio) | 3,838.38 mi (6,177.28 km) |
| Sintra to Irvine (California) | 5,650.77 mi (9,094.03 km) |
| Sintra to Irving (Texas) | 4,728.27 mi (7,609.41 km) |
| Sintra to Isabela (Puerto Rico) | 3,698.27 mi (5,951.79 km) |
