| Sintra to Ukiah (California) | 5,616.53 mi (9,038.93 km) |
| Sintra to Union (Missouri) | 4,242.40 mi (6,827.48 km) |
| Sintra to Union City (California) | 5,643.29 mi (9,082.00 km) |
| Sintra to Union City (Georgia) | 4,086.80 mi (6,577.07 km) |
| Sintra to Union City (New Jersey) | 3,354.68 mi (5,398.83 km) |
| Sintra to Union City (Tennessee) | 4,215.50 mi (6,784.20 km) |
| Sintra to Union Hill-Novelty Hill (Washington) | 5,171.81 mi (8,323.22 km) |
| Sintra to Union Park (Florida) | 4,086.53 mi (6,576.64 km) |
| Sintra to Uniondale (New York) | 3,334.32 mi (5,366.07 km) |
| Sintra to Universal City (Texas) | 4,921.25 mi (7,919.98 km) |
| Sintra to University (Florida) | 4,166.43 mi (6,705.22 km) |
| Sintra to University City (Missouri) | 4,203.55 mi (6,764.96 km) |
| Sintra to University Heights (Ohio) | 3,699.98 mi (5,954.54 km) |
| Sintra to University of California-Santa Barbara (California) | 5,705.05 mi (9,181.39 km) |
| Sintra to University Park (Texas) | 4,719.98 mi (7,596.07 km) |
