| Sintra to University Place (Washington) | 5,211.25 mi (8,386.69 km) |
| Sintra to Upland (California) | 5,625.69 mi (9,053.68 km) |
| Sintra to Upper Arlington (Ohio) | 3,814.17 mi (6,138.31 km) |
| Sintra to Upper Grand Lagoon (Florida) | 4,264.02 mi (6,862.28 km) |
| Sintra to Upper Montclair (New Jersey) | 3,361.15 mi (5,409.25 km) |
| Sintra to Urbana (Illinois) | 4,056.45 mi (6,528.23 km) |
| Sintra to Urbana (Maryland) | 3,553.90 mi (5,719.45 km) |
| Sintra to Urbana (Ohio) | 3,844.74 mi (6,187.50 km) |
| Sintra to Urbandale (Iowa) | 4,266.88 mi (6,866.87 km) |
| Sintra to Utica (New York) | 3,359.35 mi (5,406.36 km) |
| Sintra to Uvalde (Texas) | 5,007.19 mi (8,058.29 km) |
| Sintra to Vacaville (California) | 5,605.47 mi (9,021.14 km) |
| Sintra to Vadnais Heights (Minnesota) | 4,127.06 mi (6,641.86 km) |
| Sintra to Vail (Arizona) | 5,410.32 mi (8,707.07 km) |
| Sintra to Valdosta (Georgia) | 4,113.68 mi (6,620.33 km) |
