| Sintra to Dumas (Texas) | 4,850.56 mi (7,806.23 km) |
| Sintra to Dumont (New Jersey) | 3,348.52 mi (5,388.93 km) |
| Sintra to Duncan (Oklahoma) | 4,710.72 mi (7,581.17 km) |
| Sintra to Duncanville (Texas) | 4,733.50 mi (7,617.83 km) |
| Sintra to Dundalk (Maryland) | 3,513.46 mi (5,654.37 km) |
| Sintra to Dunedin (Florida) | 4,186.44 mi (6,737.43 km) |
| Sintra to Dunkirk (New York) | 3,569.64 mi (5,744.78 km) |
| Sintra to Dunmore (Pennsylvania) | 3,416.32 mi (5,498.03 km) |
| Sintra to Dunwoody (Georgia) | 4,062.68 mi (6,538.26 km) |
| Sintra to Durango (Colorado) | 5,062.54 mi (8,147.37 km) |
| Sintra to Durant (Oklahoma) | 4,657.68 mi (7,495.80 km) |
| Sintra to Durham (North Carolina) | 3,725.87 mi (5,996.21 km) |
| Sintra to Dyer (Indiana) | 3,982.09 mi (6,408.56 km) |
| Sintra to Dyersburg (Tennessee) | 4,244.32 mi (6,830.58 km) |
| Sintra to Eagan (Minnesota) | 4,138.32 mi (6,659.98 km) |
